Topic map

1. Micronutrients
   • Definition, classification, roles in nutrition
   • Deficiency diseases, prevention, and management
2. Iodine and iodine deficiency disorders
   • Sources, functions, daily requirements
   • Spectrum of iodine deficiency disorders (IDD)
   • National Iodine Deficiency Disorders Control Programme (NIDDCP)
3. Protein-energy malnutrition (PEM)
   • Definition, ecology and epidemiology
   • Classification, etiology, clinical features
   • Marasmus, kwashiorkor, and marasmic-kwashiorkor
   • Prevention, control, and management
   • PEM in Indian children and sociocultural factors
4. Nutritional problems in public health
   • Undernutrition, anemia, vitamin deficiencies, IDD, obesity, food insecurity, and dietary-related noncommunicable diseases
   • Relevant Indian public-health programmes
5. Diet in health and disease
   • Dietary modification in diabetes, hypertension, cardiovascular disease, renal disease, liver disease, gastrointestinal disorders, obesity, and infections
   • Diet and cancer
6. Assessment of nutritional status of a community
   • Direct and indirect methods
   • Anthropometry, clinical examination, biochemical assessment, dietary assessment, functional measures, and ecological indicators
   • Merits and limitations of each method
7. Child nutrition in India
   • Nutritional status, determinants, common deficiencies
   • Child-feeding practices and national child-nutrition interventions
8. Food toxicants in India
   • Common naturally occurring and adulterant-associated toxicants
   • Health effects and preventive measures

Protein-Energy Malnutrition (PEM): Detailed Notes and Management

1. Definition

• Marasmus: severe wasting without nutritional oedema
• Kwashiorkor: oedematous malnutrition
• Marasmic-kwashiorkor: severe wasting with bilateral pitting oedema

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2. Importance of PEM

Why it is important

• Increases susceptibility to infections such as diarrhoea, pneumonia, measles, tuberculosis, and malaria.
• Infection worsens poor appetite, nutrient loss, and metabolic demand, creating the infection-malnutrition vicious cycle.
• Causes growth faltering, stunting, poor school performance, cognitive delay, and reduced adult work capacity.
• Severe forms can cause death from hypoglycaemia, hypothermia, dehydration, electrolyte imbalance, sepsis, and heart failure during improper refeeding.
• Maternal malnutrition, low birth weight, and childhood undernutrition perpetuate an intergenerational cycle of malnutrition.

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3. Ecology and Epidemiology of PEM

A. Age distribution

1. Fetal life
   • Maternal undernutrition can cause intrauterine growth restriction and low birth weight.
2. 0-6 months
   • Risk is lower if exclusive breastfeeding is successful.
   • Risk increases with poor breastfeeding technique, inadequate breast milk transfer, illness, or early replacement feeding.
3. 6-24 months
   • The peak period for PEM.
   • Breast milk alone becomes insufficient after around 6 months.
   • Complementary foods may be delayed, diluted, insufficient in quantity, low in energy density, or contaminated.
4. 2-5 years
   • Recurrent infections, poor dietary diversity, parasitic infestation, and household food insecurity sustain malnutrition.

B. Distribution

• Low-income households
• Rural, tribal, urban-slum, drought-prone, and food-insecure areas
• Children of poorly nourished mothers
• Large families and families with closely spaced births
• Children with recurrent infection or chronic disease
• Orphans, neglected children, and children exposed to poor sanitation
• Communities affected by disaster, displacement, crop failure, or conflict

C. Epidemiological indicators

• Stunting indicates chronic or long-term undernutrition.
• Wasting indicates recent or acute undernutrition.
• Underweight reflects a mixture of acute and chronic undernutrition.

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4. Etiology of PEM

A. Immediate causes

1. Inadequate dietary intake

• Insufficient calories
• Inadequate protein intake
• Early cessation of breastfeeding
• Delayed introduction of complementary feeding
• Diluted animal milk or cereal gruels
• Low-frequency feeding
• Poor dietary diversity
• Low energy density of food
• Inadequate feeding during or after illness

2. Infection and infestation

• Recurrent diarrhoea
• Acute respiratory infection
• Measles
• Tuberculosis
• Malaria
• HIV
• Intestinal helminths
• Chronic urinary infections
• Persistent fever or inflammatory illness

B. Underlying causes

1. Household food insecurity

• Poverty
• Unemployment or low wages
• High food prices
• Unequal food distribution within the household
• Crop failure, drought, or natural disasters

2. Inadequate maternal and child care

• Lack of exclusive breastfeeding
• Poor complementary feeding knowledge
• Maternal illiteracy
• Maternal workload and inadequate time for child care
• Child neglect
• Gender discrimination
• Harmful feeding beliefs and food taboos

3. Unhealthy environment and poor health services

• Unsafe water
• Poor sanitation
• Open defecation
• Overcrowding
• Poor access to immunisation and primary care
• Inadequate recognition and treatment of infections

C. Basic causes

• Poverty and social inequity
• Low maternal education
• Poor female autonomy
• Food-production and distribution problems
• Inadequate public-health infrastructure
• Political instability, disaster, displacement, and conflict

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5. Sociocultural Factors Contributing to PEM in India

• Poverty and food insecurity
• Large family size
• Birth interval of less than two years
• Early marriage and adolescent pregnancy
• Maternal undernutrition and low birth weight
• Female illiteracy
• Lack of knowledge about infant and young-child feeding
• Early or abrupt weaning
• Delayed complementary feeding after 6 months
• Giving thin cereal gruel rather than thick, energy-rich feeds
• Low frequency of feeding
• Food taboos during pregnancy, lactation, and childhood illness
• Preference for adult males in household food distribution
• Failure to provide extra food during illness and convalescence
• Poor sanitation and contaminated complementary food
• Poor access to health-care facilities
• Recurrent diarrhoea and respiratory infections
• Inadequate immunisation and deworming

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6. Classification of PEM

A. WHO classification of acute malnutrition in children aged 6-59 months

B. Waterlow classification

• Wasting: low weight-for-height, representing acute malnutrition
• Stunting: low height-for-age, representing chronic malnutrition

C. Gomez classification

D. Wellcome classification

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7. Clinical Types of PEM

A. Marasmus

Definition

Typical age

Clinical features

• Severe loss of subcutaneous fat
• Marked wasting of muscles
• Very low body weight
• “Old man” or “monkey-like” face due to loss of buccal fat
• Prominent ribs
• Thin limbs and buttocks
• Loose, wrinkled skin over buttocks and thighs
• “Baggy pants” appearance
• Sunken eyes
• Child often alert, anxious, irritable, and hungry
• Appetite may be relatively preserved
• Diarrhoea and recurrent infections are common
• No bilateral pitting oedema
• Hair and skin changes are less prominent than in kwashiorkor

Important point

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B. Kwashiorkor

Definition

Typical age

Clinical features

1. Bilateral pitting oedema
   • Starts in feet and ankles
   • May progress to legs, hands, face, and generalized oedema
   • Presence of oedema may mask severe wasting
2. Growth failure
   • Weight may appear deceptively normal because of fluid retention.
3. Mental and behavioural changes
   • Apathy
   • Lethargy
   • Irritability when handled
   • Anorexia
4. Hair changes
   • Sparse, thin, dry, easily pluckable hair
   • Hypopigmentation
   • “Flag sign”: alternating pale and dark hair bands due to periods of malnutrition and relative recovery
5. Skin changes
   • Hyperpigmentation or hypopigmentation
   • Dry, scaly skin
   • “Flaky paint” or “crazy pavement” dermatosis
   • Fissures and areas of desquamation, especially over pressure areas
6. Hepatomegaly
   • Due to fatty infiltration of the liver
7. Gastrointestinal manifestations
   • Diarrhoea
   • Poor appetite
   • Abdominal distension
8. Other findings
   • Anemia
   • Repeated infections
   • Oral ulcers
   • Micronutrient deficiencies

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C. Marasmic-kwashiorkor

Features

• Severe wasting as in marasmus
• Bilateral pitting oedema as in kwashiorkor
• Higher risk of infection, metabolic disturbance, and mortality

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8. Comparison: Marasmus and Kwashiorkor

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9. Signs of Severe Acute Malnutrition Requiring Urgent Referral

• Bilateral pitting oedema
• MUAC less than 115 mm
• Severe visible wasting
• Poor appetite or failure of appetite test
• Lethargy, altered consciousness, or convulsions
• Hypoglycaemia or suspected hypothermia
• Severe dehydration or shock
• Severe diarrhoea or persistent vomiting
• Severe pneumonia or respiratory distress
• Severe anaemia
• Suspected sepsis
• Severe skin lesions
• Failure to improve in outpatient treatment
• Significant medical disease, disability, or safeguarding concern

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10. Assessment of a Child with PEM

A. History

• Age, birth weight, prematurity
• Breastfeeding history
• Age and type of complementary foods
• Frequency, amount, consistency, and diversity of feeds
• Food taboos and feeding during illness
• Duration and frequency of diarrhoea, fever, cough, vomiting
• Measles, tuberculosis exposure, malaria, HIV risk where relevant
• Deworming and immunisation status
• Previous admissions and treatment for malnutrition
• Family size, birth order, birth spacing
• Socioeconomic status, food availability, sanitation, and water supply
• Maternal health and education
• Child neglect, abandonment, or psychosocial stress

B. Examination

• Weight, length/height, MUAC
• Weight-for-height/length Z-score
• Height-for-age Z-score
• Bilateral pitting oedema
• Visible severe wasting
• Temperature and blood glucose
• Hydration status
• Appetite
• Signs of infection
• Pallor, vitamin A deficiency, skin lesions, oral ulcers
• Hair changes
• Hepatomegaly
• Developmental status

C. Investigations

• Blood glucose
• Haemoglobin or complete blood count
• Malaria testing in endemic settings
• HIV testing where indicated
• Tuberculosis assessment where indicated
• Urine examination/culture if urinary infection suspected
• Electrolytes and renal function in complicated cases
• Stool examination if persistent diarrhoea, parasites, or dysentery are suspected

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11. Management of PEM

A. Management of mild-to-moderate PEM or moderate acute malnutrition

Goals

• Correct dietary deficits
• Identify and treat medical illness
• Improve child-feeding practices
• Prevent progression to SAM
• Ensure growth monitoring and follow-up

Measures

1. Nutrition counselling
   • Continue breastfeeding up to 2 years and beyond.
   • From 6 months, give thick, energy-dense complementary foods.
   • Feed 3-4 times daily between 6-8 months, increasing to 4-5 meals daily with nutritious snacks after 9 months.
   • Give one extra meal during illness and for at least 2 weeks after recovery.
   • Use locally available foods: cereal-pulse mixtures, milk/curd, egg, fish, meat where culturally acceptable, groundnut, sesame, oil/ghee, green leafy vegetables, fruits, and legumes.
2. Increase energy density
   • Add oil, ghee, groundnut paste, milk, egg, or pulse powder.
   • Avoid watery gruels that fill the stomach but provide too little energy.
3. Treat infection
   • Diarrhoea: oral rehydration solution, zinc as locally recommended, continued feeding, and breastfeeding.
   • Treat pneumonia, malaria, worm infestation, tuberculosis, or other infection according to local protocol.
4. Micronutrients
   • Ensure age-appropriate vitamin A, iron, folate, zinc, and other supplementation based on national policy and clinical assessment.
   • Avoid starting routine iron immediately in unstable SAM because iron can worsen oxidative stress and infection risk in early stabilization.
5. Growth monitoring
   • Regular weight measurement and plotting on WHO growth charts.
   • Reassess feeding, illness, and social problems at each visit.
6. Public-health services
   • Immunisation
   • Vitamin A supplementation where indicated
   • Deworming
   • Safe water and sanitation
   • Linkage to ICDS, Anganwadi services, supplementary nutrition, and social support schemes

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12. Management of Severe Acute Malnutrition

A. Decide: outpatient or inpatient care?

Outpatient management is suitable if the child has:

• Good appetite and passes appetite test
• Is clinically alert
• No danger signs
• No severe infection or other medical complication
• Reliable caregiver and access to regular follow-up

Inpatient management is required if the child has:

• Failed appetite test or poor feeding
• Severe bilateral pitting oedema
• Hypoglycaemia
• Hypothermia
• Severe dehydration or shock
• Severe anaemia
• Lethargy, coma, convulsions
• Persistent vomiting
• Severe infection, severe pneumonia, or sepsis
• Severe skin lesions
• Major medical illness or failed outpatient care

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B. Ten steps in the inpatient management of SAM

Phase 1: Stabilization phase

Step 1. Treat or prevent hypoglycaemia

• Lethargy
• Hypothermia
• Sweating
• Convulsions
• Altered consciousness

• Check blood glucose where possible.
• Give immediate oral or nasogastric glucose-containing feed if the child can take it.
• If unconscious or unable to drink, urgent intravenous glucose and hospital management are required.
• Start feeding promptly and feed frequently, including during the night.

Step 2. Treat or prevent hypothermia

• Axillary temperature below 35.5°C
• Cold extremities
• Lethargy

• Keep child warm using clothing, blanket, skin-to-skin care, and warm room.
• Treat hypoglycaemia simultaneously.
• Feed immediately and frequently.
• Monitor temperature.

Step 3. Treat or prevent dehydration

• Do not use standard rapid intravenous rehydration unless the child is in shock.
• Use oral or nasogastric rehydration carefully under protocol.
• Monitor pulse, respiratory rate, urine output, stool losses, mental status, and signs of fluid overload.
• If shock is present, manage in hospital with cautious fluids and reassessment.

Step 4. Correct electrolyte imbalance

• Excess total body sodium despite low serum sodium
• Deficiency of potassium and magnesium

• Avoid excess sodium.
• Do not add salt to feeds.
• Provide potassium and magnesium through therapeutic feeds or prescribed supplements.
• Monitor for oedema, arrhythmia, weakness, and fluid overload.

Step 5. Treat or prevent infection

• Search actively for infection.
• Use broad-spectrum antibiotics for complicated SAM according to local or WHO protocol.
• Treat specific conditions such as pneumonia, dysentery, malaria, tuberculosis, HIV, urinary infection, or skin infection.
• Do not routinely give antibiotics to all children with non-severe undernutrition unless there is clinical infection.

Step 6. Correct micronutrient deficiencies

• Vitamin A
• Folic acid
• Zinc
• Copper
• Multivitamins
• Potassium and magnesium

Step 7. Begin cautious feeding

• Start small, frequent feeds.
• Use low-osmolarity, low-protein, low-sodium therapeutic feed such as F-75.
• Give feeds every 2-3 hours, including at night.
• Use nasogastric feeding if oral intake is insufficient.
• Monitor for vomiting, abdominal distension, worsening oedema, hypoglycaemia, diarrhoea, and heart failure.

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Phase 2: Transition and rehabilitation phase

Step 8. Achieve catch-up growth

• Shift gradually to higher-energy feeds such as F-100 or RUTF.
• Aim for catch-up growth using protocol-based energy and protein targets.
• RUTF is commonly a fortified lipid-based paste and is appropriate for uncomplicated SAM in community/outpatient settings.

Step 9. Provide sensory stimulation and emotional support

• Loving care and caregiver involvement
• Play therapy
• Age-appropriate stimulation
• Responsive feeding
• A calm environment
• Education and emotional support for caregivers

Step 10. Prepare for follow-up after recovery

• Counsel caregiver on feeding, hygiene, and danger signs.
• Continue breastfeeding.
• Ensure immunisation, vitamin supplementation, and deworming as appropriate.
• Arrange follow-up for weight, MUAC, oedema, appetite, development, and recurrent illness.
• Link family to nutrition supplementation, food security, and social welfare support.
• Assess cause of malnutrition, including household food insecurity, neglect, chronic infection, disability, HIV, tuberculosis, or malabsorption.

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13. Therapeutic Foods Used in SAM

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14. Complications During Treatment

• Hypoglycaemia
• Hypothermia
• Dehydration or overhydration
• Heart failure from excessive fluid or overly rapid feeding
• Severe infection or sepsis
• Anaemia
• Electrolyte imbalance
• Refeeding syndrome
• Persistent diarrhoea
• Failure to gain weight
• Worsening oedema
• Developmental delay and psychosocial neglect

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15. Prevention and Control of PEM

A. Maternal nutrition and care

• Prevent adolescent pregnancy.
• Promote delayed marriage and adequate birth spacing.
• Ensure antenatal care.
• Improve maternal diet, iron-folic acid supplementation, calcium where indicated, and management of anaemia.
• Monitor maternal weight gain.
• Prevent and manage maternal infections.
• Promote institutional delivery and postnatal care.

B. Appropriate infant and young-child feeding

1. Early initiation of breastfeeding
   • Within one hour of birth.
2. Exclusive breastfeeding
   • For the first 6 months.
3. Complementary feeding from 6 months
   • Continue breastfeeding.
   • Give thick, mashed, energy-rich, diverse foods.
   • Increase meal frequency with age.
   • Use responsive feeding.
4. Continue breastfeeding
   • Up to 2 years and beyond.
5. Feeding during illness
   • Continue breastfeeding and food.
   • Give an extra meal after recovery.

C. Prevention and treatment of infection

• Full immunisation
• Measles prevention
• Vitamin A supplementation according to programme guidance
• Prompt treatment of diarrhoea and pneumonia
• Zinc for childhood diarrhoea according to national guidance
• Periodic deworming in eligible areas
• Malaria prevention and treatment in endemic areas
• Tuberculosis and HIV screening/treatment when indicated

D. Water, sanitation, and hygiene

• Safe drinking water
• Handwashing with soap
• Safe disposal of faeces
• Hygienic preparation and storage of complementary foods
• Prevention of food contamination
• Use of toilets and improved sanitation

E. Growth monitoring and promotion

• Regular measurement of weight and height
• Use WHO growth charts
• MUAC screening in the community
• Early detection of growth faltering
• Home visits and counselling by frontline workers
• Referral of children with wasting, oedema, poor appetite, or repeated illness

F. Food security and social interventions

• Improve household income and food access
• Public distribution and food-security measures
• Nutrition-sensitive agriculture
• Women’s education and empowerment
• Family planning
• Supplementary nutrition through Anganwadi centres
• School meals and community nutrition programmes
• Social protection for vulnerable households

G. Indian programme approach

• Integrated Child Development Services (ICDS)
• Anganwadi services
• Supplementary nutrition
• Growth monitoring
• Nutrition and health education
• Immunisation
• Referral services
• POSHAN Abhiyaan
• Anaemia control programmes
• Vitamin A supplementation
• Mid-Day Meal/PM POSHAN programme
• Maternal and child-health services under the public health system

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16. Key Exam Points

• PEM is due to inadequate energy and protein intake, often compounded by infection and social deprivation.
• The peak age is 6 months to 2 years, when complementary feeding is often inadequate.
• Marasmus = severe wasting, no oedema.
• Kwashiorkor = bilateral pitting oedema, poor appetite, skin/hair changes, fatty liver, apathy.
• Marasmic-kwashiorkor = wasting plus oedema.
• SAM is diagnosed by WHZ/WLZ less than -3 SD, MUAC less than 115 mm in 6-59 months, or bilateral pitting oedema.
• Children with SAM and complications require inpatient stabilization.
• Initial treatment priorities are: hypoglycaemia, hypothermia, dehydration, electrolyte disturbance, infection, micronutrient deficiency, cautious feeding, catch-up growth, stimulation, and follow-up.
• Long-term prevention depends on maternal nutrition, breastfeeding, appropriate complementary feeding, infection prevention, sanitation, food security, education, and growth monitoring.

Micronutrients: Detailed Notes

Definition

1. Vitamins
2. Minerals and trace elements

Micronutrient malnutrition

• Iron deficiency and nutritional anaemia
• Vitamin A deficiency
• Iodine deficiency disorders
• Folate deficiency
• Vitamin B12 deficiency
• Zinc deficiency
• Vitamin D and calcium deficiency
• Fluoride excess or deficiency
• Vitamin C deficiency
• Thiamine, riboflavin, niacin, and other B-complex vitamin deficiencies

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1. Classification of Micronutrients

A. Vitamins

1. Fat-soluble vitamins

2. Water-soluble vitamins

B. Minerals and trace elements

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2. Role of Micronutrients in Nutrition

A. Growth and development

• Vitamin A, zinc, iodine, iron, folate, vitamin B12, vitamin D, and calcium are important for normal fetal, infant, and child growth.
• Iodine is essential for brain development in fetal life and early childhood.
• Folate is needed before conception and in early pregnancy to prevent neural-tube defects.
• Zinc is necessary for cell growth, tissue repair, and sexual maturation.
• Vitamin D, calcium, and phosphorus are essential for skeletal growth.

B. Energy metabolism

• Thiamine is needed in carbohydrate metabolism.
• Riboflavin and niacin participate in oxidation-reduction reactions.
• Vitamin B6 is important in amino-acid metabolism.
• Magnesium is needed for many ATP-dependent enzymatic reactions.

C. Hematopoiesis and oxygen transport

• Iron is required for haemoglobin.
• Folate and vitamin B12 are essential for DNA synthesis and normal red-cell maturation.
• Vitamin B6 participates in haem synthesis.
• Copper helps iron metabolism.

D. Immune function and resistance to infection

• Vitamin A preserves epithelial barriers and supports immune function.
• Zinc is essential for cell-mediated immunity and wound healing.
• Iron, selenium, vitamin C, vitamin D, folate, and other nutrients contribute to immune function.

E. Vision and epithelial integrity

• Vitamin A forms retinal, a component of rhodopsin needed for dark adaptation.
• It maintains normal epithelial tissue in the eye, respiratory tract, gastrointestinal tract, and skin.

F. Bone and tooth health

• Vitamin D promotes absorption of calcium and phosphate.
• Calcium and phosphorus are structural components of bone and teeth.
• Fluoride increases resistance of tooth enamel to dental caries.

G. Endocrine and nervous-system function

• Iodine is required for thyroxine and triiodothyronine synthesis.
• Vitamin B12, folate, thiamine, niacin, and vitamin B6 are important in nervous-system function.
• Calcium, magnesium, and sodium influence nerve and muscle function.

H. Antioxidant defense

• Vitamin C, vitamin E, selenium, zinc, and carotenoids help protect cells from oxidative damage.
• Selenium is part of glutathione peroxidase and other antioxidant systems.

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3. Causes and Risk Factors for Micronutrient Deficiency

A. Inadequate dietary intake

• Diet based mainly on polished rice, refined cereals, or starchy foods
• Low intake of pulses, green leafy vegetables, fruits, milk, eggs, fish, and meat
• Poor dietary diversity
• Low household purchasing power
• Food insecurity and famine
• Restrictive diets and food taboos

B. Increased physiological requirement

• Infancy and childhood
• Adolescence
• Pregnancy
• Lactation
• Menstruation
• Rapid growth
• Recovery after illness

C. Poor absorption or impaired utilization

• Chronic diarrhoea
• Celiac disease
• Inflammatory bowel disease
• Malabsorption syndromes
• Liver disease
• Pancreatic disease
• Gastric surgery
• Chronic alcohol use
• Certain medications

D. Excessive losses

• Blood loss, especially menstrual or gastrointestinal blood loss
• Hookworm infestation
• Chronic diarrhoea
• Kidney disease
• Burns and severe illness

E. Infection and inflammation

F. Social and environmental factors

• Poverty
• Maternal illiteracy
• Poor sanitation
• Unsafe water
• Inadequate health-care access
• Early marriage and adolescent pregnancy
• Large family size
• Poor infant and young-child feeding practices
• Gender discrimination in household food allocation

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4. Major Micronutrient Deficiency Disorders

A. Iron Deficiency and Iron-Deficiency Anaemia

Functions of iron

• Formation of haemoglobin and myoglobin
• Oxygen transport
• Electron transport and energy production
• Brain development
• Immune and cognitive function

Dietary sources

• Liver and organ meat
• Meat
• Poultry
• Fish

• Green leafy vegetables
• Pulses, beans, lentils
• Millets
• Jaggery
• Nuts and seeds
• Fortified cereals and flour

Causes of iron deficiency

• Inadequate dietary iron
• Poor bioavailability from cereal-based diets
• Increased requirement in infancy, adolescence, pregnancy, and lactation
• Menstrual blood loss
• Hookworm infestation
• Malaria in endemic areas
• Chronic blood loss from the gastrointestinal tract
• Malabsorption

Clinical features

• Pallor
• Fatigue and weakness
• Breathlessness on exertion
• Dizziness and headache
• Poor concentration and reduced school performance
• Reduced work capacity
• Pica
• Koilonychia, or spoon-shaped nails
• Glossitis and angular stomatitis in severe cases
• Growth and cognitive impairment in children

Complications

• Preterm birth
• Low birth weight
• Increased maternal morbidity
• Poor cognitive development in children
• Reduced work productivity
• Greater vulnerability during infection and blood loss

Prevention and control

• Dietary diversification
• Iron-folic acid supplementation in adolescents, women of reproductive age, and pregnant women as per national protocol
• Delayed cord clamping where appropriate
• Deworming in eligible populations
• Malaria control in endemic areas
• Iron fortification of staple foods
• Treatment of infection, blood loss, and underlying disease
• Nutrition education to combine iron-rich food with vitamin C-rich foods

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B. Vitamin A Deficiency

Functions of vitamin A

• Formation of rhodopsin for vision in dim light
• Maintenance of corneal and conjunctival epithelium
• Immunity
• Growth and cell differentiation
• Reproductive health

Dietary sources

• Liver
• Egg yolk
• Milk, butter, ghee, cheese
• Fish liver oil

• Green leafy vegetables
• Carrot
• Pumpkin
• Mango
• Papaya
• Tomato
• Yellow and orange fruits and vegetables

Risk factors

• Poor dietary intake
• Protein-energy malnutrition
• Recurrent diarrhoea
• Measles
• Poor fat intake and fat malabsorption
• Young age, especially 6 months to 6 years

Clinical manifestations: Xerophthalmia

Important features

• Night blindness is the earliest functional symptom.
• Corneal xerosis and keratomalacia can rapidly lead to irreversible blindness.
• Vitamin A deficiency increases severity and mortality from infections, especially measles and diarrhoea.

Management principles

• Treat clinical xerophthalmia urgently with therapeutic vitamin A under national/WHO protocol.
• Treat accompanying PEM, diarrhoea, measles, and other infections.
• Improve dietary intake of vitamin A-rich foods.
• Promote breastfeeding.
• Ensure immunisation, particularly measles-containing vaccine.

Prevention

• Dietary diversification
• Breastfeeding
• Vitamin A supplementation in eligible children according to national programme guidance
• Food fortification where available, such as fortified edible oil, milk, or sugar
• Prevention and prompt treatment of measles and diarrhoea

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C. Iodine Deficiency Disorders

Functions of iodine

• Thyroxine, T4
• Triiodothyronine, T3

• Fetal brain development
• Physical growth
• Neurodevelopment
• Metabolic rate
• Reproductive function

Sources

• Iodized salt
• Marine fish and seafood
• Milk and dairy products
• Eggs
• Foods grown in iodine-sufficient soil

Deficiency manifestations

• Goitre
• Hypothyroidism
• Abortion and stillbirth
• Congenital anomalies
• Increased perinatal and infant mortality
• Cretinism or severe congenital hypothyroidism syndrome
• Intellectual disability
• Deaf-mutism
• Spastic diplegia
• Growth retardation
• Poor school performance
• Reduced intelligence quotient
• Mental dullness and apathy in children and adults

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D. Zinc Deficiency

Functions of zinc

• Activity of many enzymes
• DNA and protein synthesis
• Cell division
• Growth and sexual maturation
• Wound healing
• Taste and appetite
• Immune function
• Vitamin A metabolism

Dietary sources

• Meat
• Fish and seafood
• Egg
• Milk and dairy products
• Pulses and legumes
• Whole grains
• Nuts and seeds

Causes

• Low dietary intake
• Cereal-based diets with high phytate content
• Malabsorption
• Chronic diarrhoea
• Chronic liver or kidney disease
• Increased requirements during rapid growth
• Prematurity

Clinical features

• Growth retardation
• Delayed sexual maturation
• Loss of appetite
• Recurrent infections
• Delayed wound healing
• Dermatitis, often periorificial or acral
• Alopecia
• Diarrhoea
• Loss or alteration of taste
• Poor night vision may be worsened because zinc is involved in vitamin A metabolism

Prevention and management

• Improve dietary diversity
• Include animal foods, pulses, nuts, seeds, and fortified foods
• Give zinc supplementation in children with acute diarrhoea according to national protocol
• Treat underlying malabsorption, chronic disease, or infection
• Use zinc-containing multiple micronutrient supplements where indicated

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E. Folate Deficiency

Functions

• DNA synthesis
• Red-cell maturation
• Amino-acid metabolism
• Fetal neural-tube development

Sources

• Green leafy vegetables
• Legumes and pulses
• Citrus fruits
• Liver
• Fortified wheat flour and cereals

Causes

• Poor diet
• Increased need in pregnancy
• Malabsorption
• Chronic alcohol intake
• Certain medicines, such as some antiepileptics and antifolate drugs

Clinical features

• Megaloblastic anaemia
• Pallor, fatigue, dyspnoea
• Glossitis
• Diarrhoea
• In pregnancy: increased risk of neural-tube defects in the fetus

Prevention

• Periconceptional folic-acid supplementation
• Iron-folic acid supplementation during pregnancy as per national guidelines
• Dietary intake of folate-rich foods
• Flour fortification where implemented

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F. Vitamin B12 Deficiency

Functions

• DNA synthesis
• Maturation of red blood cells
• Myelin formation and neurological function

Sources

• Meat
• Fish
• Eggs
• Milk and dairy products
• Fortified foods

Causes

• Strict vegan diet without supplementation
• Pernicious anaemia
• Gastric surgery
• Ileal disease or resection
• Malabsorption disorders
• Long-term use of certain medicines, including metformin in some people

Clinical features

• Megaloblastic anaemia
• Glossitis
• Fatigue and pallor
• Paresthesia
• Gait disturbance
• Cognitive change
• Peripheral neuropathy
• Developmental delay in infants of severely deficient mothers

Management

• Confirm diagnosis where possible.
• Replace vitamin B12 orally or parenterally depending on cause and severity.
• Treat dietary deficiency and underlying malabsorption.
• Do not delay treatment in patients with neurological signs.

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G. Vitamin D and Calcium Deficiency

Vitamin D functions

• Increases calcium and phosphate absorption
• Supports bone mineralization
• Maintains muscle function

Sources of vitamin D

• Sunlight exposure through skin synthesis
• Egg yolk
• Fish and fish liver oils
• Fortified milk and foods

Calcium sources

• Milk, curd, paneer, cheese
• Ragi
• Sesame seeds
• Green leafy vegetables
• Small fish eaten with bones
• Fortified foods

Deficiency manifestations

• Delayed dentition
• Frontal bossing
• Rachitic rosary
• Widened wrists
• Bow legs or knock knees
• Delayed walking
• Bone pain and muscle weakness

• Bone pain
• Muscle weakness
• Fragility fractures

• Poor bone mineralization
• Tetany in severe hypocalcaemia
• Increased risk of osteoporosis in later life when combined with other risk factors

Prevention

• Safe sunlight exposure
• Adequate vitamin D and calcium intake
• Supplementation in high-risk groups as clinically indicated
• Prevention of maternal vitamin D deficiency

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H. Vitamin C Deficiency

Functions

• Collagen synthesis
• Wound healing
• Iron absorption
• Antioxidant action
• Immune support

Sources

• Amla
• Guava
• Citrus fruits
• Tomato
• Green leafy vegetables
• Fresh fruits and vegetables

Deficiency: Scurvy

• Bleeding gums
• Petechiae and bruising
• Poor wound healing
• Bone pain
• Irritability in children
• Anaemia
• Corkscrew hair in some cases

Prevention

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I. Thiamine Deficiency

Functions

Sources

• Whole grains
• Pulses
• Nuts
• Pork
• Seeds
• Unpolished rice

Deficiency: Beriberi

Prevention

• Use whole or minimally polished cereals.
• Ensure dietary diversity.
• Give thiamine promptly to persons at high risk of deficiency, especially before carbohydrate loading in severely malnourished or alcohol-dependent patients.

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J. Riboflavin Deficiency

Sources

• Milk and milk products
• Egg
• Meat
• Green leafy vegetables
• Pulses

Features

• Angular stomatitis
• Cheilosis
• Glossitis
• Magenta tongue
• Seborrhoeic dermatitis
• Photophobia

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K. Niacin Deficiency

Sources

• Meat
• Fish
• Groundnut
• Pulses
• Whole grains
• Tryptophan-containing protein foods

Deficiency: Pellagra

1. Dermatitis
2. Diarrhoea
3. Dementia

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5. Public-Health Importance of Micronutrient Deficiency

• Poor growth and developmental delay
• Reduced intelligence and school achievement
• Maternal anaemia and poor pregnancy outcomes
• Low birth weight and prematurity
• Childhood blindness due to vitamin A deficiency
• Goitre and impaired intellectual development due to iodine deficiency
• Increased susceptibility to infection
• Reduced physical capacity and work productivity
• Increased morbidity and mortality

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6. Strategies to Prevent and Control Micronutrient Deficiencies

A. Dietary diversification

• Cereals and millets
• Pulses and legumes
• Green leafy vegetables
• Yellow and orange fruits and vegetables
• Milk and milk products
• Egg, fish, meat, and poultry where acceptable and affordable
• Nuts and seeds
• Iodized salt

Merits

• Provides several nutrients together
• Promotes healthy lifelong food practices
• Reduces risk of multiple deficiencies
• Supports local food systems

Limitations

• May be difficult where poverty, food insecurity, seasonality, or cultural restrictions exist
• Does not quickly correct severe deficiency

B. Food fortification

• Iodization of salt
• Iron and folic acid fortification of wheat flour
• Fortification of rice with iron, folic acid, and vitamin B12
• Vitamin A and D fortification of edible oils and milk
• Double-fortified salt containing iodine and iron

Merits

• Reaches large populations
• Does not require people to change food habits substantially
• Cost-effective for population-wide deficiencies
• Helps prevent deficiency continuously

Limitations

• Requires quality control, monitoring, legislation, and industry cooperation
• May not reach households outside formal food distribution systems
• Does not replace dietary diversity

C. Supplementation

• Iron-folic acid for pregnant women, adolescents, and other target groups
• Vitamin A supplementation for eligible children
• Calcium and vitamin D in selected high-risk groups
• Therapeutic zinc in childhood diarrhoea
• Folic acid before conception and in early pregnancy
• Vitamin B12 in documented deficiency

Merits

• Useful for rapid correction of deficiency
• Can target vulnerable groups
• Essential in clinical deficiency and emergencies

Limitations

• Requires a functioning health system and regular supply
• Adherence can be poor
• May cause side effects
• Incorrect unsupervised use can be harmful, especially for fat-soluble vitamins and iron

D. Biofortification

• Iron
• Zinc
• Provitamin A carotenoids

E. Infection control and sanitation

• Immunisation
• Diarrhoea prevention and treatment
• Deworming
• Malaria control in endemic areas
• Safe water and sanitation
• Hand hygiene

F. Nutrition education and behaviour change

• Exclusive breastfeeding for the first 6 months
• Timely, adequate complementary feeding from 6 months
• Use of thick, diverse, energy- and micronutrient-rich foods
• Continued feeding during illness
• Extra food after illness
• Use only adequately iodized salt
• Combining plant iron sources with vitamin C-rich foods
• Avoiding tea or coffee immediately with iron-rich meals

G. Screening, surveillance, and treatment

• Haemoglobin for anaemia
• Urinary iodine or salt iodine levels in IDD surveys
• Serum retinol in vitamin A surveys where appropriate
• Growth and clinical signs
• Dietary diversity
• Coverage of supplementation and fortification programmes

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7. Micronutrient Deficiency and PEM

• Vitamin A
• Iron
• Folate
• Zinc
• Copper
• Vitamin D
• Calcium
• B-complex vitamins

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8. Short Note: Micronutrients in Severe Acute Malnutrition

• Give therapeutic feeds containing appropriate micronutrients.
• Give folic acid, zinc, copper, and multivitamins according to treatment protocol.
• Correct potassium and magnesium deficiency.
• Avoid routine iron during the initial stabilization phase.
• Start iron later, during catch-up growth, when appetite returns and infection/metabolic instability are controlled.
• Treat infection and continue close clinical monitoring.

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9. Key Examination Summary

• Micronutrients are vitamins and minerals needed in small amounts but essential for life, growth, immunity, and metabolism.
• They do not provide calories.
• Important public-health micronutrient deficiencies are iron, vitamin A, iodine, zinc, folate, vitamin B12, vitamin D, and calcium deficiencies.
• Iron deficiency causes anaemia, reduced learning, reduced work capacity, and adverse pregnancy outcomes.
• Vitamin A deficiency causes night blindness, xerophthalmia, keratomalacia, and preventable childhood blindness.
• Iodine deficiency causes goitre, hypothyroidism, fetal loss, intellectual impairment, and reduced learning ability.
• Zinc deficiency causes poor growth, diarrhoea, poor wound healing, and impaired immunity.
• Folate deficiency causes megaloblastic anaemia and neural-tube defects.
• Main preventive methods are dietary diversification, breastfeeding and complementary feeding, supplementation, food fortification, iodized salt, infection control, sanitation, and nutrition education.
• Micronutrient deficiency can coexist with PEM and worsens infection, growth failure, disability, and mortality.

1. Protein-energy malnutrition
2. Micronutrients

Remaining questions

1. Iodine and iodine deficiency disorders
   • Sources and functions of iodine
   • Spectrum of iodine deficiency disorders
   • National Iodine Deficiency Disorders Control Programme
2. Nutritional problems in public health
   • Undernutrition, anaemia, vitamin deficiencies, IDD
   • Obesity and diet-related noncommunicable diseases
   • Food insecurity and major Indian nutrition programmes
3. Diet in disease
   • Principles of therapeutic diet
   • Diet in diabetes, hypertension, cardiovascular disease, obesity, renal disease, liver disease, gastrointestinal disorders, fever, and infections
   • Diet and cancer
4. Assessment of nutritional status of a community
   • Anthropometric, clinical, biochemical, dietary, functional, and ecological methods
   • Merits and demerits of each method
5. Nutritional status of children in India
   • Major indicators and determinants
   • Child nutrition services and management of malnutrition
6. Food toxicants commonly occurring in India
   • Natural toxicants, adulterants, contaminants, and prevention
7. Socioeconomic and sociocultural factors affecting nutrition
   • Poverty, education, family size, gender, customs, taboos, food habits, and sanitation

Methods of Assessment of Nutritional Status of a Community

Introduction

• Identify the type, magnitude, and distribution of malnutrition
• Detect high-risk groups
• Diagnose deficiency disorders early
• Plan nutrition interventions
• Monitor and evaluate nutrition programmes
• Assess trends over time and compare communities

1. Clinical examination
2. Anthropometry
3. Biochemical or laboratory assessment
4. Functional assessment
5. Dietary assessment
6. Vital and health statistics
7. Ecological assessment

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1. Clinical Examination

Definition

Procedure

• General appearance and build
• Hair
• Eyes
• Lips and mouth
• Tongue
• Teeth and gums
• Skin
• Nails
• Thyroid
• Skeletal system
• Muscles
• Abdomen and liver
• Nervous system
• Presence of oedema

Important clinical signs and their likely nutritional association

Merits

• Simple and rapid
• Cheap and feasible in large field surveys
• Requires little equipment
• Can be performed at peripheral health-care level
• Detects obvious clinical deficiency diseases
• Useful for immediate referral and treatment
• Particularly useful in children for visible wasting, oedema, xerophthalmia, goitre, rickets, and anaemia

Demerits

• Detects deficiency mainly at a late stage, after physical signs appear
• Most clinical signs are non-specific
• Many deficiencies have no visible signs
• Subjective and dependent on examiner skill
• Cannot quantify severity or body nutrient stores accurately
• Infection, genetic disease, and other illnesses may mimic nutritional signs
• Inter-observer variation is common

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2. Anthropometric Assessment

Definition

Common anthropometric measurements

A. In infants and children

1. Weight
2. Length or height
3. Mid-upper arm circumference, MUAC
4. Head circumference, especially in infants
5. Chest circumference
6. Skinfold thickness
7. Weight-for-age
8. Height-for-age
9. Weight-for-height or weight-for-length
10. Body mass index-for-age
11. Presence of bilateral pitting oedema

B. In adults

1. Body weight
2. Height
3. Body mass index, BMI
4. Waist circumference
5. Hip circumference
6. Waist-hip ratio
7. MUAC
8. Skinfold thickness
9. Recent unintentional weight loss

Important indices in children

Interpretation using Z-scores

Body Mass Index

Mid-upper arm circumference

Uses

• Rapid screening of acute malnutrition in children aged 6-59 months
• Useful in emergencies and community surveys
• Useful where accurate weighing scales or height boards are unavailable
• Less affected by short-term hydration changes than body weight

Skinfold thickness

• Triceps
• Biceps
• Subscapular
• Suprailiac

Merits of anthropometry

• Simple, non-invasive, safe, and acceptable
• Relatively inexpensive
• Suitable for large community surveys
• Provides quantitative results
• Useful for monitoring child growth over time
• Identifies underweight, stunting, wasting, overweight, and obesity
• MUAC is rapid and practical in field conditions
• Standard WHO growth references enable comparison between populations
• Can identify children needing referral, supplementary feeding, or therapeutic care

Demerits of anthropometry

• Does not identify the exact nutrient deficient
• Cannot distinguish nutritional growth failure from growth failure due to chronic disease, endocrine disease, or genetic causes
• Requires accurate age, especially for weight-for-age and height-for-age
• Measurement errors occur without trained staff and calibrated equipment
• Weight may be falsely elevated in oedema, ascites, or fluid retention
• Height changes slowly and may not detect recent nutritional deterioration
• Weight can be influenced by dehydration, illness, and recent food intake
• Skinfold measurement needs skill and good-quality calipers
• Reference standards may not fully account for population variation
• Does not directly assess body biochemical stores or functional impairment

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3. Biochemical Assessment

Definition

Common biochemical tests

Merits

• Can detect subclinical deficiency before overt disease develops
• More objective than clinical signs
• Can estimate nutrient stores or recent intake for certain nutrients
• Useful for confirming diagnosis
• Useful for monitoring response to supplementation or fortification
• Helps differentiate types of anaemia and other nutritional disorders
• Useful in evaluating public-health programmes, such as iodine or iron interventions

Demerits

• Expensive for community-wide screening
• Requires laboratories, trained technicians, equipment, sample transport, and quality control
• Invasive when blood sampling is needed
• May be unacceptable to some community members
• Results may be affected by infection, inflammation, hydration, pregnancy, renal/liver disease, and time of sampling
• Many biomarkers lack specificity for nutritional status alone
• Serum albumin is influenced strongly by inflammation and disease, and is not a reliable isolated marker of dietary protein intake
• Difficult to conduct in remote areas
• Not suitable as the sole method of nutritional assessment

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4. Functional Assessment

Definition

Examples

Merits

• Reflects the real biological effect of nutritional deficiency
• Can identify functional impairment before classical signs become severe
• Useful for evaluating the impact of interventions
• Hand-grip strength is simple, non-invasive, and useful for muscle function in older children and adults
• Useful in research and clinical assessment

Demerits

• Many tests are non-specific
• Function may be influenced by infection, fatigue, age, motivation, disability, and chronic disease
• Some functional tests require special equipment and trained personnel
• Difficult to standardize in large community surveys
• Cognitive and performance tests may be influenced by education, language, culture, and socioeconomic factors
• Less useful for rapid field screening

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5. Dietary Assessment

Definition

A. Direct dietary methods

1. 24-hour dietary recall

• Quick
• Cheap
• Easy to perform
• No literacy required
• Useful for large surveys
• Can estimate recent food and nutrient intake

• Depends on memory
• One day may not represent usual intake
• Portion-size estimation is difficult
• Underreporting or overreporting is common
• Requires food-composition tables and trained interviewers for nutrient calculation

2. Diet history

• Gives information about usual food habits
• Identifies cultural practices, food taboos, and meal patterns
• Useful in counselling and individual assessment

• Time-consuming
• Depends heavily on memory and interviewer skill
• Quantification is difficult
• Subject to recall bias

3. Food frequency questionnaire

• Easy and inexpensive
• Suitable for large epidemiological studies
• Useful for identifying dietary patterns
• Useful for estimating frequency of consumption of vitamin A-rich foods, iron-rich foods, fruits, vegetables, and animal-source foods

• Does not accurately estimate quantity
• Depends on memory
• May not reflect actual portion size
• Needs validation for the population being studied

4. Weighed food record or weighed inventory method

• Most accurate method for measuring actual intake
• Gives quantitative estimate of food and nutrient intake
• Useful for research, metabolic studies, and validation of other methods

• Very time-consuming and expensive
• Requires scales, trained observers, and cooperation of the household
• Can alter normal eating behaviour
• Not feasible for large community surveys
• Difficult when eating outside the home

5. Duplicate portion method

• Can measure actual nutrient intake precisely
• Useful for assessing contaminants or toxic substances as well as nutrient intake

• Very expensive
• Highly burdensome
• Requires laboratory analysis
• Impractical for routine community assessment

6. Food diary

• Provides detailed individual intake information
• Can capture day-to-day variation if maintained for several days

• Requires literacy and motivation
• Recording itself may change dietary habits
• Incomplete recording is common
• Data analysis is time-consuming

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B. Indirect dietary methods

1. Household food consumption survey

• Useful for estimating household food availability
• Helps assess food security
• Can identify household-level cereal, pulse, milk, fat, fruit, and vegetable availability

• Does not show individual intake
• Does not account accurately for food eaten outside the home, visitors, waste, or unequal food distribution
• Cannot identify intrafamily gender or age bias

2. Food balance sheet

• Simple national-level overview
• Useful for planning food policy and monitoring food supply trends
• Allows international comparison

• Measures food availability, not actual consumption
• Does not show distribution among households or individuals
• Does not identify vulnerable groups
• Does not account precisely for wastage and cooking losses
• Cannot estimate micronutrient bioavailability well

3. Market survey and food-price survey

• Useful for studying food access and affordability
• Helps identify barriers to dietary diversity
• Useful in programme planning

• Does not measure actual intake or nutritional status
• Prices and availability can change quickly
• Requires repeated surveys across seasons

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6. Vital and Health Statistics

Definition

Important indicators

• Infant mortality rate
• Under-five mortality rate
• Neonatal mortality rate
• Low birth weight prevalence
• Maternal mortality ratio
• Prevalence of anaemia
• Incidence of diarrhoea and acute respiratory infection
• Measles incidence
• Prevalence of stunting, wasting, and underweight
• School attendance and performance
• Hospital admissions for severe acute malnutrition
• Prevalence of goitre, xerophthalmia, rickets, and nutritional anaemia

Merits

• Data may already be available from routine health records
• Inexpensive compared with conducting new surveys
• Useful for trend analysis
• Helps identify high-risk geographic areas and vulnerable populations
• Useful for programme planning and evaluation
• Covers large populations

Demerits

• Indirect measure of nutritional status
• Poor-quality recording and underreporting are common
• Does not establish the specific nutritional cause
• Mortality and morbidity are influenced by many non-nutritional factors
• Data may be delayed, incomplete, or not representative
• Cannot identify individual nutritional deficiency

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7. Ecological Assessment

Definition

Areas assessed

• Household income and employment
• Food production and agricultural patterns
• Food availability and price
• Land ownership
• Drought, flood, crop failure, or disaster
• Water supply and sanitation
• Housing and overcrowding
• Maternal education
• Family size and birth spacing
• Breastfeeding and complementary-feeding practices
• Food customs, taboos, and gender discrimination
• Access to health services
• Immunisation coverage
• Presence of endemic infections
• Food distribution systems and social welfare programmes

Merits

• Identifies root causes of malnutrition
• Essential for planning sustainable interventions
• Helps explain geographic and social differences in nutritional status
• Useful for food security, policy, and programme design
• Can identify communities at risk before overt malnutrition becomes widespread

Demerits

• Indirect method
• Does not diagnose nutritional deficiency in an individual
• Cause-and-effect relationships may be difficult to establish
• Requires data from many sectors
• Time-consuming
• Data may be incomplete or unreliable
• Socioeconomic and cultural variables are difficult to quantify

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8. Summary Table: Merits and Demerits

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9. ABCD Concept

• A - Anthropometric assessment
• B - Biochemical assessment
• C - Clinical assessment
• D - Dietary assessment

• Functional assessment
• Vital and health statistics
• Ecological and socioeconomic assessment

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10. Conclusion

1. Anthropometry
2. Clinical examination
3. Dietary survey
4. Selected biochemical tests
5. Health statistics
6. Socioeconomic and environmental assessment