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Nutrition and Health in Community Medicine

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1. Introduction: Concept of Nutrition in Community Medicine

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2. Definition of Malnutrition

1. Wasting
2. Stunting
3. Xerophthalmia (Vitamin A deficiency)
4. Nutritional anaemias
5. Endemic goitre

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3. Undernutrition: The Major Problem in Developing Countries

3.1 Burden of Undernutrition in India

• 18.5% of children are born with low birth weight
• 35.7% are underweight (weight for age, <5 years)
• 38.4% are stunted (height for age, <5 years)
• 21% are wasted (weight for height)
• About 33% of adult men and 36% of adult women have BMI below 18.5 (indicating chronic energy deficiency)

• Stunting - chronic malnutrition (low height for age)
• Wasting - acute malnutrition (low weight for height)
• Underweight - low weight for age

3.2 Protein-Energy Malnutrition (PEM)

• Low birth weight in malnourished mothers
• Poor growth in children
• High mortality between 12 and 24 months of age
• Estimated as underlying cause in ~30% of deaths in children under 5

1. Inadequate intake of food in both quantity and quality
2. Infections (diarrhoea, respiratory infections, measles, intestinal worms) that increase nutritional requirements while decreasing absorption

3.3 Kwashiorkor vs Marasmus

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4. Micronutrient Malnutrition ("Hidden Hunger")

4.1 Vitamin A Deficiency (VAD)

• Single most frequent cause of preventable blindness among pre-school children in developing countries
• Children aged 6 months to 6 years are most vulnerable (high requirements + frequent infections)
• ~20% of children with VAD are at increased risk of death from common infections
• ~2% are blinded or suffer serious sight impairment
• Leading to xerophthalmia (from night blindness to corneal ulceration/keratomalacia)

4.2 Iron Deficiency Anaemia (Nutritional Anaemia)

• Affects all age groups: pre-school children, school children, pregnant women, elderly
• Even mild anaemia reduces resistance to fatigue and impairs psychological and physical behaviour
• In pregnancy: increases risk of maternal/foetal mortality, associated with abortions, premature births, postpartum haemorrhage, and low birth weight. In India, 19% of maternal deaths were found to be due to anaemia
• Immunity: Iron deficiency impairs cellular responses and immune function
• Work capacity: Even mild anaemia causes significant reduction in maximal work capacity and productivity

• Hb < 10 g/dl: Severe anaemia - high dose iron or blood transfusion
• Hb 10-12 g/dl: Moderate - iron and folic acid supplementation

4.3 Iodine Deficiency Disorders (IDD)

• About 1.5 billion people live in iodine-deficient environments
• Causes goitre, cretinism, and brain damage
• Each year: >30,000 stillbirths and >120,000 births with mental retardation, physical stunting, deaf-mutism or paralysis
• Even without overt disease, iodine deficiency causes mental dullness and apathy

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5. Ecology of Malnutrition: Causative Factors

(1) Conditioning Influences

• Diarrhoea, intestinal parasites, measles, whooping cough, malaria, tuberculosis all contribute
• In poor environments, children may suffer infections for almost half of their first three years of life

(2) Cultural Influences

• Food habits, customs, beliefs, traditions: Deep psychological roots linked to love, social prestige, and family traditions. Passed from generation to generation
• Food taboos: Most often applied to vulnerable groups - infants, toddlers, pregnant and lactating women (e.g., papaya avoided in pregnancy as it is believed to cause abortion)
• People choose poor diets even when good ones are available due to cultural influences

(3) Socio-economic Factors

• Poverty is the most fundamental determinant
• Large family size, poor maternal health, failure of lactation, premature termination of breastfeeding
• Adverse child-rearing practices: over-diluted cow's milk, discarding cooking water from cereals, delayed supplementary feeding

(4) Food Production

• Agricultural productivity, seasonal variations, land distribution
• Post-harvest losses and food storage issues

(5) Health and Other Services

• Inadequate antenatal care, failure of breastfeeding promotion, poor access to health services

The Malnutrition-Infection Cycle

• A child's nutritional status at any point depends on past nutritional history
• This is linked to the mother's health and nutritional status
• Which was in turn influenced by HER living conditions during her own childhood

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6. Effects of Malnutrition on the Community

Direct Effects

• Frank nutritional deficiency diseases: kwashiorkor, marasmus, xerophthalmia, anaemia, goitre
• Subclinical forms of deficiency (the larger "hidden" portion of the iceberg)

Indirect Effects

• High morbidity and mortality: Nearly 50% of total deaths in developing countries occur among children under 5 years (vs < 5% in developed countries)
• Retarded physical and mental growth - may be permanent
• Lowered vitality and productivity of the population
• Reduced life expectancy
• High rates of maternal mortality, stillbirths, and low birth weight

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7. Assessment and Measurement of Undernutrition

In Children

• 13.5 cm = Satisfactory nutritional status

• 12.5-13.5 cm = Mild to moderate malnutrition
• <12.5 cm = Severe malnutrition

Nutrition Surveillance Indicators

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8. Social Aspects of Nutrition

Overnutrition (The "New" Problem in Developed Countries)

• High incidence of obesity, diabetes, hypertension, cardiovascular and renal diseases, disorders of liver and gall bladder
• These are attributed to excess caloric intake, physical inactivity, and poor dietary quality

Food Security

• Availability - sufficient food produced
• Access - physical and economic access
• Utilization - proper use and absorption
• Stability - consistent access over time

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9. Food Surveillance and Food Hygiene

Milk Hygiene

1. The dairy animal (tuberculosis, brucellosis, Q fever, salmonellosis, staphylococcal enterotoxin poisoning)
2. Human handlers
3. Environment (contaminated vessels, polluted water, flies, dust)

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10. Community Nutrition Programmes in India

Key Programme Details

• Single massive dose of 200,000 IU of vitamin A (oily preparation) orally every 6 months to all pre-school children
• Delivered by peripheral health workers
• Technology developed at the National Institute of Nutrition, Hyderabad
• Evaluation showed significant reduction in VAD in children

• Pregnant women and lactating mothers: 100 mg elemental iron + 0.5 mg folic acid daily
• Children (1-12 years): 20 mg elemental iron + 0.1 mg folic acid daily for 100 days
• Implemented via MCH centres, PHCs, and ICDS projects

• Expanded programme targeting all age groups including adolescents

• Launched 1962 (Himalayan goitre belt initially)
• Iodisation of common salt is the primary strategy
• Technology for iron fortification of salt also developed at NIN Hyderabad

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11. Prevention of PEM at Community Level

Health Promotion

1. Measures directed to pregnant and lactating women (education, supplement distribution)
2. Promotion of breastfeeding (exclusive breastfeeding for 6 months)
3. Development of low-cost weaning foods - frequent small feeds
4. Measures to improve family diet
5. Nutrition education - correct feeding practices
6. Home economics
7. Family planning and birth spacing
8. Improved family environment

Specific Protection

1. Protein and energy-rich foods in the child's diet (milk, eggs, fresh fruits)
2. Immunization (breaks the infection-malnutrition cycle)
3. Food fortification

Role of International Agencies

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12. Nutrition Indicators in Global Health Monitoring (SDG Framework)

• Exclusive breastfeeding rate (0-5 months)
• Early initiation of breastfeeding
• Incidence of low birth weight
• Children under 5 years who are stunted (SDG 2.2.1)
• Children under 5 years who are wasted (SDG 2.2.2)
• Children under 5 years who are overweight (SDG 2.2.2)
• Anaemia prevalence in children
• Anaemia prevalence in women of reproductive age

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13. Nutrition in Disasters

1. Assess food supplies after disaster
2. Gauge nutritional needs of affected population
3. Calculate daily food rations for large population groups
4. Monitor nutritional status of affected population

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Summary: The Double Burden of Malnutrition

• Developing countries: Undernutrition dominates - PEM, micronutrient deficiencies, stunting, wasting
• Developed countries: Overnutrition dominates - obesity, cardiovascular disease, diabetes, hypertension
• Middle-income countries (including India): Face BOTH problems simultaneously

1. Surveillance and assessment of nutritional status
2. Identification of high-risk groups (infants, pregnant women, lactating mothers, elderly)
3. Targeted supplementation and fortification programmes
4. Nutrition education and behavioural change
5. Food security interventions
6. Breaking the malnutrition-infection cycle through immunization and sanitation
7. Inter-sectoral coordination (health, agriculture, education, social welfare)

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Assessment of Nutritional Status in Community Medicine

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1. Introduction and Purpose

• Obtain precise information on the prevalence and geographic distribution of nutritional problems in a given community
• Identify individuals or population groups "at risk" or in greatest need of assistance
• Enable policy formulation and programme planning
• Evaluate the effectiveness of existing nutrition programmes

Without nutritional assessment, problems cannot be defined and policies cannot be formulated. The purpose is to develop a health care programme that meets the needs defined by the assessment.

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2. Survey Design Principles

• All age groups
• Both sexes
• Different socio-economic groups

• Duration of survey
• Type of survey (cross-sectional vs longitudinal)
• Standardization of measurement techniques and instruments
• Opportunity for an intensive sub-sample investigation

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3. Natural History Framework for Assessment

• Prepathogenic period: Food balance sheets and dietary surveys detect diminishing reserves before any clinical signs appear
• Biochemical studies: Span both prepathogenic and pathogenic periods - detect physiological and metabolic alterations early
• Anthropometric studies: Come into play as malnutrition becomes measurable physically
• Clinical signs and morbidity: Detect illness after the clinical horizon is crossed
• Mortality data: The final and most advanced stage indicator

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4. The Seven Methods of Nutritional Assessment

Method 1: Clinical Examination

• Malnutrition cannot be quantified on the basis of clinical signs alone
• Many deficiencies are unaccompanied by physical signs
• Most signs lack specificity and are subjective in nature

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Method 2: Anthropometry

Key Anthropometric Measurements:

• < 18.5: Underweight (chronic energy deficiency)
• 18.5-24.9: Normal
• 25-29.9: Overweight
• ≥ 30: Obese

MUAC (Mid-Upper Arm Circumference) Interpretation:

• > 13.5 cm = Satisfactory nutritional status
• 12.5 - 13.5 cm = Mild to moderate malnutrition
• < 12.5 cm = Severe malnutrition

Growth Charts:

• The first indicator of PEM is underweight for age
• The most practical detection tool for field health workers is maintaining growth charts
• These indicate at a glance whether a child is gaining or losing weight, and whether they are on track

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Method 3: Laboratory and Biochemical Assessment

(a) Laboratory Tests

(b) Biochemical Tests

• Measure individual nutrient concentration in body fluids (e.g., serum retinol, serum iron)
• Detect abnormal metabolites in urine (e.g., urinary iodine) after a loading dose
• Measure enzymes where the vitamin is a co-factor (e.g., in riboflavin deficiency)
• Help establish malnutrition in its pre-clinical stages

• Cannot be applied on a large scale to assess a whole community
• Often carried out on a sub-sample of the population
• Most tests reveal only current nutritional status
• Useful to quantify mild deficiencies
• Best used to prove or disprove questions raised by clinical examination

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Method 4: Functional Indicators

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Method 5: Assessment of Dietary Intake

Diet Survey Methods:

• Most widely employed method in India
• Considered fairly accurate if properly carried out
• Survey team visits households and weighs all food going to be cooked/eaten plus waste
• Duration: 1 to 21 days; commonly 7 days ("one dietary cycle")

• Foods analyzed in the state in which they are normally consumed
• More accurate nutritionally but not easily acceptable to the community

• Useful for large population surveys in a short time
• Retrospective inquiry about food eaten in the previous 24 or 48 hours
• If properly carried out, gives reliable results
• Also collects data on dietary habits and practices

Data Translation:

1. Mean intake (grams) of each food group: cereals, pulses, vegetables, fruits, milk, meat, fish, eggs
2. Mean nutrient intake per adult man value or "consumption unit"

What Dietary Assessment Provides:

• Dietary intake patterns and specific foods consumed
• Estimated nutrient intakes
• Relative dietary inadequacies
• Basis for health education activities
• Information for changes needed in agriculture and food production industries

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Method 6: Vital Statistics

• Protein-energy malnutrition, anaemia, xerophthalmia
• Other vitamin deficiencies, endemic goitre
• Diarrhoea, measles, parasitic infestations

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Method 7: Assessment of Ecological Factors

Components of Ecological Study:

• An indirect method of assessing food consumption at the national/regional level
• Food supplies related to census population to derive levels of food consumption
• Gives per capita availability of food and nutrients at population level
• Detects food shortages at the macro level

• Land use, crop yields, food production and storage
• Market prices, purchasing power of the population
• Seasonal variation in food supply

• Food habits, taboos, beliefs, and traditions
• Cultural practices around child feeding and weaning
• Social prestige of certain foods

• Prevalence of infections (diarrhoea, parasites, TB, measles)
• Safe water and sanitation coverage
• Health service utilization

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5. Community Nutrition Surveillance Indicators

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6. Summary: Integrated Approach

1. Rapid screening (growth charts, MUAC, haemoglobin)
2. Targeted biochemical testing on high-risk sub-samples
3. Dietary surveys to understand intake patterns
4. Ecological analysis to address root causes
5. Vital statistics for programme monitoring and evaluation

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