---

NUTRITIONAL DEFICIENCY DISORDERS, BALANCED DIET & NUTRITIONAL ANAEMIA

Social & Preventive Medicine - University Exam Answer

---

PART A: NUTRITIONAL DEFICIENCY DISORDERS IN INDIA

Classification / Enumeration

NUTRITIONAL DEFICIENCY DISORDERS IN INDIA
│
├── 1. PROTEIN-ENERGY MALNUTRITION (PEM)
│       ├── Kwashiorkor (protein deficiency)
│       ├── Marasmus (calorie deficiency)
│       └── Marasmic-Kwashiorkor (mixed)
│
├── 2. NUTRITIONAL ANAEMIA
│       ├── Iron Deficiency Anaemia (most common)
│       ├── Folate Deficiency (megaloblastic)
│       └── Vitamin B12 Deficiency
│
├── 3. VITAMIN A DEFICIENCY (VAD)
│       └── Xerophthalmia → Keratomalacia → Blindness
│
├── 4. IODINE DEFICIENCY DISORDERS (IDD)
│       ├── Goitre
│       ├── Cretinism
│       └── Intellectual impairment
│
├── 5. VITAMIN D DEFICIENCY
│       └── Rickets (children), Osteomalacia (adults)
│
├── 6. VITAMIN C DEFICIENCY
│       └── Scurvy
│
├── 7. VITAMIN B-COMPLEX DEFICIENCIES
│       ├── Thiamine (B1) → Beriberi
│       ├── Niacin (B3) → Pellagra
│       └── Riboflavin (B2) → Ariboflavinosis
│
└── 8. FLUOROSIS (excess fluoride - endemic in India)
        ├── Dental fluorosis
        └── Skeletal fluorosis

Special note for India: A condition unique to India is Lathyrism (neurolathyrism) - caused by toxic consumption of Lathyrus sativus (Khesari dal). It causes spastic paralysis of lower limbs and is prevalent in Madhya Pradesh, UP, Bihar, and Odisha.

Most Important Nutritional Deficiency Disorders in India (summary table):

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PART B: BALANCED DIET

Definition

"A balanced diet is defined as one which contains a variety of foods in such quantities and proportions that the need for energy, amino acids, vitamins, minerals, fats, carbohydrates and other nutrients is adequately met for maintaining health, vitality and general well-being, and also makes a small provision for extra nutrients to withstand short duration of leanness."

Principles of Constructing a Balanced Diet:

BALANCED DIET - CONSTRUCTION PRINCIPLES
─────────────────────────────────────────────────────
STEP 1: Meet PROTEIN requirement first
        → 10-15% of daily energy intake
        → Sources: pulses, milk, eggs, meat, fish

STEP 2: FATS - limited to 15-30% of daily energy
        → Visible fats (oils, butter) + invisible fats
        → Include essential fatty acids

STEP 3: CARBOHYDRATES - remaining energy (55-75%)
        → Rich in natural fibre
        → Prefer complex carbohydrates

STEP 4: Meet MICRONUTRIENT requirements
        → Vitamins (A, B-complex, C, D, E, K)
        → Minerals (Iron, Calcium, Iodine, Zinc)
─────────────────────────────────────────────────────

RDA for Indians (2020) - Key Values (Park's Table 28):

Components of Balanced Diet (Food Groups):

    ┌─────────────────────────────────────────┐
    │         FOOD PYRAMID (India)            │
    │                                         │
    │      [Fats/Oils/Sugars - USE SPARINGLY] │
    │   [Milk/Dairy | Meat/Fish/Eggs/Pulses]  │
    │      [Vegetables]   [Fruits]            │
    │   [Cereals / Grains - BASE of diet]     │
    └─────────────────────────────────────────┘

1. Cereals and millets - energy, B-vitamins
2. Pulses and legumes - protein, iron, folate
3. Milk and milk products - protein, calcium, B12
4. Meat, fish, eggs - complete protein, iron, B12
5. Vegetables (green leafy) - iron, folate, carotene, vitamin C
6. Fruits - vitamins, antioxidants
7. Fats and oils - fat-soluble vitamins, EFAs
8. Sugar/jaggery - energy (use sparingly)

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PART C: NUTRITIONAL ANAEMIA (Detailed)

Definition (WHO)

"Nutritional anaemia is a condition in which the haemoglobin content of blood is lower than normal as a result of a deficiency of one or more essential nutrients, regardless of the cause of such deficiency." - WHO

WHO Cut-off Values for Anaemia (Haemoglobin levels):

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Aetiology / Causes of Nutritional Anaemia

CAUSES OF NUTRITIONAL ANAEMIA
│
├── A. DIETARY DEFICIENCY
│       ├── Low iron intake (common in India - cereal-based diet)
│       ├── Poor bio-availability of iron (<5% absorbed from plant foods)
│       ├── Folate deficiency (especially in pregnancy)
│       └── Vitamin B12 deficiency (vegetarian diet)
│
├── B. INCREASED DEMAND
│       ├── Pregnancy and lactation
│       ├── Rapid growth in infancy/adolescence
│       └── Multiple, closely spaced pregnancies
│
├── C. INCREASED LOSSES
│       ├── Menstrual blood loss (women)
│       └── Delivery blood loss
│
├── D. INFECTIONS AND PARASITES
│       ├── Malaria (haemolysis)
│       ├── Hookworm infestation (chronic blood loss)
│       └── Other intestinal parasites
│
└── E. INHIBITORS OF ABSORPTION
        ├── Phytates (in cereals)
        ├── Tannins (in tea/coffee)
        └── Lack of Vitamin C (enhancer)

---

The Problem (Magnitude)

• Iron deficiency anaemia is the most widespread micronutrient deficiency affecting all age groups
• 72.7% of children up to 3 years (urban) and 81.2% (rural) are anaemic
• Adolescent girls: 72.6% prevalence (DLHS 2002-04)
• Bihar has highest prevalence (87.6%); Nagaland lowest (44.3%)
• 19% of maternal deaths in India are attributable to anaemia
• Most severely affects: women of reproductive age (15-49 years), children (6-35 months), and low socioeconomic strata

Types of Nutritional Anaemia:

TYPES OF NUTRITIONAL ANAEMIA
│
├── 1. IRON DEFICIENCY ANAEMIA (most common)
│       Type: Microcytic Hypochromic
│       Deficiency: Iron
│       Lab: ↓Hb, ↓MCV, ↓MCH, ↓Serum Ferritin, ↑TIBC
│
├── 2. MEGALOBLASTIC ANAEMIA
│       Type: Macrocytic
│       Deficiency: Folate / Vitamin B12
│       Lab: ↓Hb, ↑MCV, hypersegmented neutrophils
│       Common in: pregnant women (poor income groups)
│
└── 3. DIMORPHIC ANAEMIA
        Type: Mixed (micro + macro)
        Deficiency: Both iron AND folate/B12
        Common in: combined deficiency states

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Detrimental Effects of Anaemia

---

Interventions / Management

MANAGEMENT OF NUTRITIONAL ANAEMIA
│
├── SEVERE ANAEMIA (Hb < 10 g/dL)
│       → High dose iron therapy
│       → Blood transfusion if needed
│
├── MODERATE ANAEMIA (Hb 10-12 g/dL)
│       ├── (1) Iron & Folic Acid Supplementation
│       ├── (2) Iron Fortification
│       └── (3) Other strategies
│
└── MILD / PREVENTION
        ├── Dietary modification
        ├── Deworming
        ├── Health education
        └── Treatment of malaria

• National Nutritional Anaemia Prophylaxis Programme (NNAPP) - launched during the 4th Five Year Plan
• Daily IFA tablets to "at-risk" groups: pregnant women, lactating mothers, children under 12 years
• Each tablet: 60 mg elemental iron + 500 mcg folic acid
• Pregnant women: minimum 180 days during pregnancy
• Children 1-5 years: small dose (20mg iron + 100 mcg folate)

• Fortification of common salt with iron (ferric ortho-phosphate / ferrous sulphate with sodium bisulphate)
• Developed at National Institute of Nutrition (NIN), Hyderabad
• Reduces anaemia prevalence significantly over 12-18 months
• Advantages: universal coverage (all segments of population), no special delivery system required
• Commercial production started: 1985

• Dietary habit modification (increase iron-rich foods, vitamin C for absorption)
• Control of parasites (hookworm, malaria)
• Nutrition education

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PART D: ANAEMIA MUKT BHARAT (AMB)

Introduction

---

The 6×6×6 Strategy

╔══════════════════════════════════════════════════════════════╗
║           ANAEMIA MUKT BHARAT - 6×6×6 STRATEGY              ║
╠══════════════════════════════════════════════════════════════╣
║                                                              ║
║  6 BENEFICIARIES        6 INTERVENTIONS      6 INSTITUTIONAL ║
║  (Target Groups)                              MECHANISMS     ║
║  ─────────────────   ────────────────────   ───────────────  ║
║  1. Children          1. Prophylactic IFA   1. WIFS          ║
║     (6-59 months)        Supplementation       Programme     ║
║                                                              ║
║  2. Children          2. Periodic           2. NDD           ║
║     (5-9 years)          Deworming             Programme     ║
║                                                              ║
║  3. Adolescents       3. Intensified        3. NCEAR         ║
║     (10-19 years)        BCC Campaign          (National     ║
║                                              Centre for      ║
║  4. Pregnant          4. Testing &           Excellence on   ║
║     women               Treatment using      Anaemia         ║
║                         digital methods       Research)      ║
║  5. Lactating         5. Fortified food     4. Convergence   ║
║     women               promotion            with other      ║
║                                               Ministries     ║
║  6. Women of          6. Addressing         5. Strengthening ║
║     Reproductive         non-nutritional      supply chain   ║
║     Age (15-49 yrs)      causes of                          ║
║                          anaemia            6. AMB Dashboard ║
║                                               (Digital       ║
║                                                Portal)       ║
╚══════════════════════════════════════════════════════════════╝

---

6 BENEFICIARIES (Life Cycle Approach):

1. Children (6-59 months)
2. Children (5-9 years)
3. Adolescents - girls and boys (10-19 years)
4. Pregnant women
5. Lactating mothers (0-6 months child)
6. Women of Reproductive Age (WRA) - 15-49 years (non-pregnant, non-lactating)

---

6 INTERVENTIONS:

• National Deworming Day (NDD): biannual mass deworming on 10th February and 10th August for children and adolescents (age 1-19 years)
• Pregnant women dewormed in the 2nd trimester via ANC contacts

• Compliance to IFA and deworming
• Appropriate Infant and Young Child Feeding (IYCF)
• Emphasis on complementary foods for children > 6 months
• Increase intake of iron-rich, protein-rich, and Vitamin C-rich foods
• Dietary diversification and food fortification
• Promoting delayed cord clamping

• Digital invasive haemoglobinometer at field level / Sub-Health Centres / HWCs
• Semi-auto analyzer at PHC and above
• Point-of-care treatment following Anaemia Management Protocols

• Food fortification with iron, folic acid, and B12

• Malaria control
• Sickle cell disease screening and management
• Other haemoglobinopathies

---

6 INSTITUTIONAL MECHANISMS:

1. WIFS (Weekly Iron Folic Acid Supplementation) Programme
2. NDD (National Deworming Day) Programme
3. NCEAR - National Centre for Excellence and Advanced Research on Anaemia Control (apex national laboratory for anaemia screening and diagnosis; technical inputs for policy and guidelines)
4. Convergence with other Ministries - MoWCD, MoE, MoRD etc.
5. Strengthening supply chain and logistics - auto indents at district level; centralized procurement at state level; IFA and Albendazole as essential drugs
6. AMB Dashboard and Digital Portal - One Stop Shop for anaemia data monitoring

---

Historical Timeline of Anaemia Control in India:

1970 ─── National Nutritional Anaemia Prophylaxis Programme (NNAPP)
  │
1991 ─── National Nutritional Anaemia Control Programme
  │
2007 ─── 12 by 12 Initiative
  │
2013 ─── National Iron Plus Initiative (NIPI)
  │
2018 ─── ANAEMIA MUKT BHARAT (Intensified NIPI) ← CURRENT

---

Public Health Importance of AMB:

• Anaemia is the 3rd leading cause of DALYs lost for females aged 15-44 years
• Causes GDP loss of 1.18%
• AMB is a landmark initiative as it addresses anaemia through a life cycle approach - from children to women of reproductive age
• It integrates both nutritional and non-nutritional causes
• Digital tools (AMB Dashboard) allow real-time monitoring

---

QUICK SUMMARY FLOWCHART

NUTRITIONAL ANAEMIA - OVERVIEW FLOWCHART
┌─────────────────────────────────────────────┐
│           PREDISPOSING FACTORS              │
│  Poor diet → Low iron/folate intake         │
│  Poverty, Parasites, Multiple pregnancies   │
└──────────────┬──────────────────────────────┘
               ↓
┌─────────────────────────────────────────────┐
│              ANAEMIA                        │
│   Hb < WHO cut-off for age/sex/pregnancy    │
└──────────────┬──────────────────────────────┘
               ↓
┌─────────────────────────────────────────────┐
│           CONSEQUENCES                      │
│  ↑Maternal mortality | ↓Work capacity       │
│  LBW babies | ↑Infection susceptibility     │
└──────────────┬──────────────────────────────┘
               ↓
┌─────────────────────────────────────────────┐
│       PREVENTION & CONTROL                  │
│  IFA Supplementation                        │
│  Iron Fortification                         │
│  Deworming (NDD)                            │
│  Dietary Diversification                    │
│  ANAEMIA MUKT BHARAT (2018)                 │
│       ↓ 6×6×6 Strategy                      │
│  Target: ↓3% per year (2018-2022)           │
└─────────────────────────────────────────────┘

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Sources: Park's Textbook of Preventive and Social Medicine (SPM), National Health Mission - Anaemia Mukt Bharat (nhm.gov.in)

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EXAM TIPS - HOW TO PRESENT THIS ANSWER:

• The 6×6×6 AMB table (box format)
• Types of nutritional anaemia (classification box)
• Historical timeline of anaemia control programmes
• WHO Hb cut-off table

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STAGES OF INTOXICATION

Forensic Medicine & Toxicology (FMT) - University Exam Answer

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INTRODUCTION

• Higher centres of the cerebrum (judgment, inhibition) are depressed first
• Then the limbic system (emotional release), cerebellum (coordination)
• Finally brainstem (vital centres - respiration, heart rate)
• This is a descending CNS depression - from cortex downward

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FACTORS AFFECTING DEGREE OF INTOXICATION

FACTORS MODIFYING ALCOHOL INTOXICATION
│
├── INDIVIDUAL FACTORS
│       ├── Age (young more susceptible)
│       ├── Sex (women more susceptible - less body water, less ADH)
│       ├── Body weight (lower weight → higher BAC)
│       ├── Tolerance (chronic alcoholics tolerate higher BAC)
│       └── Genetic factors (ADH enzyme polymorphism)
│
├── PHARMACOKINETIC FACTORS
│       ├── Empty stomach → faster absorption → higher BAC
│       ├── Food in stomach → slows absorption
│       ├── Concentration of beverage (low % = faster absorption)
│       └── Rate of consumption
│
└── DRUG INTERACTIONS
        ├── Barbiturates + Alcohol = SYNERGISM (potentiation)
        ├── Sedatives, tranquilizers worsen CNS depression
        └── Metronidazole, disulfiram - antabuse reaction

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STAGES OF ACUTE ALCOHOL INTOXICATION

---

STAGE 1: SUBCLINICAL / SOBRIETY STAGE

┌──────────────────────────────────────────────────────────┐
│  STAGE 1 - SUBCLINICAL (BAC: 10-50 mg%)                  │
│                                                          │
│  • Behaviour appears NORMAL to ordinary observation      │
│  • Slight physiological impairment detectable only on    │
│    careful scientific testing by 0.05 g/dL               │
│  • No clinically visible signs of intoxication           │
│  • Slight change in mood, feeling relaxed                │
│  • Reaction time slightly increased (measurable only     │
│    by instruments)                                       │
└──────────────────────────────────────────────────────────┘

---

STAGE 2: EUPHORIA STAGE

┌──────────────────────────────────────────────────────────┐
│  STAGE 2 - EUPHORIA / "TIPSY" (BAC: 50-100 mg%)          │
│                                                          │
│  • EUPHORIA - sense of well-being, happiness             │
│  • Increased self-confidence, talkative, sociable        │
│  • Loss of inhibitions, minor social restraints removed  │
│  • Impaired reaction time, attention, visual acuity      │
│  • Impaired judgment and sensory-motor coordination      │
│  • Individual may STILL appear sober (esp. at 70-100     │
│    mg%) - important forensic point!                      │
│  • Mild flushing of face                                 │
│                                                          │
│  ★ LEGAL NOTE: In India, limit for drunken driving       │
│    = 30 mg/100 mL blood (0.03 g/dL)                     │
└──────────────────────────────────────────────────────────┘

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STAGE 3: EXCITEMENT STAGE

┌──────────────────────────────────────────────────────────┐
│  STAGE 3 - EXCITEMENT (BAC: 100-200 mg%)                 │
│                                                          │
│  • Progressive impairment of all sensory-motor activity  │
│  • Impaired reaction time, attention, visual acuity      │
│  • Emotional lability - laughing, weeping, arguing       │
│  • Increased drowsiness and disorientation               │
│  • By 0.15 g/dL: slurred speech, blurred vision          │
│  • By 0.20 g/dL: OBVIOUS DRUNKENNESS                    │
│       - Loss of coordination                            │
│       - Staggering / ataxic gait                        │
│       - Slurred speech (dysarthria)                     │
│       - Nystagmus may appear                            │
│  • Person appears visibly "drunk" to observers           │
│  • Impaired memory formation begins                      │
└──────────────────────────────────────────────────────────┘

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STAGE 4: CONFUSION / INCOORDINATION STAGE

┌──────────────────────────────────────────────────────────┐
│  STAGE 4 - CONFUSION (BAC: 200-300 mg%)                  │
│                                                          │
│  • Marked disorientation (time, place, person)           │
│  • Grossly impaired coordination - STAGGERING            │
│  • May be LETHARGIC AND SLEEPY or                        │
│    HOSTILE AND AGGRESSIVE (emotional upheaval)           │
│  • Blackouts (anterograde amnesia) - memory of events    │
│    during this period is lost ("Alcoholic blackout")     │
│  • Markedly increased pain threshold - may injure self   │
│    without feeling it                                    │
│  • Vomiting may occur (risk of aspiration)               │
│  • By 0.30 g/dL: many individuals FALL ASLEEP or        │
│    PASS OUT                                              │
└──────────────────────────────────────────────────────────┘

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STAGE 5: STUPOR STAGE

┌──────────────────────────────────────────────────────────┐
│  STAGE 5 - STUPOR (BAC: 300-400 mg%)                     │
│                                                          │
│  • Impaired consciousness                                │
│  • STUPOR - patient responds only to strong stimuli      │
│  • Approaching UNCONSCIOUSNESS                           │
│  • Breathing becomes slow and labored                    │
│  • Skin pallid, cold, clammy                             │
│  • Vomiting + loss of gag reflex → risk of aspiration    │
│    pneumonia and asphyxia (dangerous!)                   │
│  • Hypothermia                                           │
│  • Hypoglycemia may occur                                │
│  • Extreme risk of alcohol poisoning death               │
└──────────────────────────────────────────────────────────┘

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STAGE 6: COMA STAGE

┌──────────────────────────────────────────────────────────┐
│  STAGE 6 - COMA / DEATH (BAC: > 400 mg%)                 │
│                                                          │
│  • UNCONSCIOUSNESS / DEEP COMA                           │
│  • No response to stimuli                                │
│  • Respiratory depression / respiratory failure          │
│  • Cardiovascular collapse                               │
│  • Aspiration of vomit → death by asphyxia              │
│  • Hypothermia                                           │
│  • POSSIBLE DEATH                                        │
│                                                          │
│  ★ FORENSIC NOTE: Most deaths from acute alcohol         │
│    intoxication occur at BAC ≥ 0.40 g/dL                │
│    Chronic alcoholics may survive up to 0.60-0.70 g/dL  │
│    (due to tolerance)                                    │
└──────────────────────────────────────────────────────────┘

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MASTER TABLE: STAGES OF INTOXICATION AT A GLANCE

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FLOWCHART: DESCENDING CNS DEPRESSION BY ALCOHOL

ALCOHOL CONSUMPTION
        ↓
HIGHER CORTICAL CENTRES (Frontal lobe)
→ Judgment ↓, Inhibitions ↓, Euphoria ↑        [Stage 1-2]
        ↓
LIMBIC SYSTEM
→ Emotional lability, Excitement                [Stage 3]
        ↓
CEREBELLUM
→ Ataxia, Incoordination, Staggering            [Stage 3-4]
        ↓
BASAL GANGLIA / DEEPER STRUCTURES
→ Confusion, Disorientation, Stupor             [Stage 4-5]
        ↓
BRAINSTEM (Vital Centres)
→ Respiratory Depression, Coma, DEATH           [Stage 6]

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MEDICOLEGAL / FORENSIC IMPORTANCE (Important for exam!)

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CONDITIONS MIMICKING ALCOHOL INTOXICATION

DIFFERENTIAL DIAGNOSIS OF APPARENT INTOXICATION
│
├── MEDICAL CONDITIONS
│       ├── Epilepsy / post-ictal state
│       ├── Hypoglycemia
│       ├── Viral meningitis / encephalitis
│       ├── Brain tumors
│       ├── Diabetic ketoacidosis (acetone breath mimics alcohol smell)
│       └── Alcoholic liver disease with hepatic encephalopathy
│
├── TRAUMA
│       ├── Head injury (road traffic accident, assault, falls)
│       └── Subdural hematoma
│
└── POISONINGS
        ├── Methyl alcohol (methanol)
        ├── Tranquilizers / sedative-hypnotics
        ├── Hallucinogens
        ├── Carbon monoxide, Carbon dioxide poisoning
        └── Hydrogen sulfide

Forensic Pearl: An examining doctor must have comprehensive knowledge not only of alcohol and its effects but also of trauma and poisons that may mimic signs of alcohol intoxication to give a reliable medicolegal opinion. (Essentials of FMT, 36th ed.)

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EXAMINATION OF AN INTOXICATED PERSON (Clinical)

1. Signs of CONSUMPTION: Smell of alcohol on breath, slurred speech, red conjunctivae, flushed face
2. Signs of INFLUENCE: Inability to walk straight, inability to touch tip of nose with finger, nystagmus
3. Signs of INTOXICATION: Vomiting, mildly constricted pupils, semiconscious with altered sensorium, brisk reflexes or unconscious

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EXAM TIPS:

• Always draw the Master Table - it is the most scoring diagram in this topic
• Mention BAC values in BOTH g/dL and mg% (examiners check for this)
• Chronic tolerance is a key differentiating point - always include it
• Legal limit in India = 30 mg% - high-yield medicolegal fact
• For 5-mark questions: Draw table + note 3 key medicolegal points
• For 10-mark questions: Use the full structured approach shown above

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CLASSIFICATION OF NUTRIENTS, BALANCED DIET & ROLE OF FATS

Social & Preventive Medicine (SPM) - University Exam Essay

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PART A: CLASSIFICATION OF NUTRIENTS BY CHEMICAL COMPOSITION

Introduction

"Nutrients are organic and inorganic complexes contained in food. There are about 50 different nutrients which are normally supplied through the foods we eat. Each nutrient has specific functions in the body. Most natural foods contain more than one nutrient." (Park's SPM)

---

Classification of Nutrients

---

PRIMARY CLASSIFICATION: By Chemical Composition

╔══════════════════════════════════════════════════════════════════════╗
║              CLASSIFICATION OF NUTRIENTS                             ║
║              (By Chemical Composition)                               ║
╠══════════════════════════════════════════════════════════════════════╣
║                                                                      ║
║   MACRONUTRIENTS                    MICRONUTRIENTS                   ║
║   (Proximate Principles)            (Required in small amounts)      ║
║   ─────────────────────             ───────────────────────          ║
║   1. PROTEINS                       1. VITAMINS                      ║
║      • C, H, O, N, S                   a) Fat-soluble                ║
║      • 10-15% of daily energy             - Vitamin A                ║
║        intake                             - Vitamin D                ║
║                                           - Vitamin E                ║
║   2. FATS (LIPIDS)                        - Vitamin K                ║
║      • C, H, O                         b) Water-soluble              ║
║      • 15-30% of daily energy             - Vitamin B complex        ║
║        intake                             - Vitamin C                ║
║                                                                      ║
║   3. CARBOHYDRATES                  2. MINERALS                      ║
║      • C, H, O                         a) Macrominerals              ║
║      • 50-80% of daily energy             Ca, P, Na, K, Mg, S, Cl   ║
║        intake                          b) Microminerals/Trace        ║
║                                           Fe, I, Zn, Cu, F, Co, Mn  ║
╚══════════════════════════════════════════════════════════════════════╝

---

ADDITIONAL CLASSIFICATIONS (for complete answer):

FUNCTION-BASED CLASSIFICATION
│
├── BODY-BUILDING FOODS
│       Milk, meat, poultry, fish, eggs, pulses, nuts, oilseeds
│       (Rich in protein)
│
├── ENERGY-GIVING FOODS
│       Cereals, sugars, roots, tubers, fats and oils
│       (Rich in carbohydrates and fats)
│
└── PROTECTIVE FOODS
        Vegetables, fruits, milk
        (Rich in vitamins and minerals)

1. Cereals and millets
2. Pulses (legumes)
3. Vegetables
4. Nuts and oilseeds
5. Fruits
6. Animal foods
7. Fats and oils
8. Sugar and jaggery
9. Condiments and spices
10. Miscellaneous foods

---

PART B: BALANCED DIET - DEFINITION

Definition (Park's SPM, ICMR)

"A balanced diet is defined as one which contains a variety of foods in such quantities and proportions that the need for energy, amino acids, vitamins, minerals, fats, carbohydrates and other nutrients is adequately met for maintaining health, vitality and general well-being, and also makes a small provision for extra nutrients to withstand short duration of leanness."

Principles of Constructing a Balanced Diet

┌──────────────────────────────────────────────────────────────┐
│       PRINCIPLES OF BALANCED DIET CONSTRUCTION               │
│                                                              │
│  STEP 1: PROTEIN — 10 to 15% of total daily energy          │
│          Sources: milk, pulses, eggs, meat, fish             │
│                                                              │
│  STEP 2: FATS — 15 to 30% of total daily energy             │
│          Include visible + invisible fats                    │
│          Emphasize MUFAs and PUFAs; limit SFAs               │
│                                                              │
│  STEP 3: CARBOHYDRATES — 50 to 80% of total daily energy    │
│          Rich in natural dietary fibre                       │
│          Prefer complex carbohydrates over refined           │
│                                                              │
│  STEP 4: MICRONUTRIENTS — RDA amounts (as per ICMR 2020)    │
│          Vitamins + Minerals                                 │
└──────────────────────────────────────────────────────────────┘

Characteristics of a Balanced Diet:

1. Adequate - meets all nutritional requirements
2. Varied - contains different food groups
3. Proportionate - in correct ratio
4. Safe - free from contaminants
5. Palatable - acceptable to the consumer

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PART C: ROLE OF FATS IN HUMANS (Detailed)

Introduction to Fats

Fats are macronutrients composed of Carbon (C), Hydrogen (H), and Oxygen (O). They contribute 15-30% of the total daily energy intake in a balanced diet. They are the most concentrated source of energy in the diet, yielding 9 kcal per gram (compared to 4 kcal/g for proteins and carbohydrates).

---

Chemical Classification of Dietary Fats

DIETARY FATS - CHEMICAL CLASSIFICATION
│
├── A. SIMPLE LIPIDS
│       ├── Triglycerides (Triacylglycerols) - main storage form
│       └── Waxes
│
├── B. COMPOUND LIPIDS
│       ├── Phospholipids (e.g., lecithin)
│       ├── Glycolipids
│       └── Lipoproteins (HDL, LDL, VLDL)
│
└── C. DERIVED LIPIDS
        ├── Fatty acids (Free)
        ├── Cholesterol
        └── Fat-soluble vitamins (A, D, E, K)

---

Classification by Degree of Saturation

FATTY ACIDS CLASSIFIED BY DEGREE OF SATURATION
│
├── 1. SATURATED FATTY ACIDS (SFAs)
│       • No double bonds between carbon atoms
│       • Solid at room temperature
│       • Mostly ANIMAL fats (exceptions: coconut, palm oil)
│       • Examples: Palmitic acid, Stearic acid
│       • Effect: ↑LDL cholesterol, ↑CHD risk (if excess)
│       • Sources: Ghee, butter, coconut oil (92% SFA),
│                  palm kernel oil (83% SFA)
│
├── 2. MONOUNSATURATED FATTY ACIDS (MUFAs)
│       • ONE double bond (C=C)
│       • Liquid at room temperature
│       • Effect: ↓LDL, ↑HDL - CARDIOPROTECTIVE
│       • Example: Oleic acid
│       • Sources: Groundnut oil (41%), Rice bran oil (43%),
│                  Canola oil (60%), Mustard oil (65%)
│
├── 3. POLYUNSATURATED FATTY ACIDS (PUFAs)
│       • TWO or MORE double bonds
│       • Essential Fatty Acids (EFA) included here
│       • Effect: ↓LDL, ↓Total cholesterol, ↓CHD risk
│       • Minimum intake: 6% of total energy (ICMR)
│       │
│       ├── Omega-6 (n-6) PUFAs
│       │       • Linoleic Acid (LA) - ESSENTIAL
│       │       • Arachidonic Acid
│       │       • Sources: Safflower (73%), Sunflower (62%),
│       │                  Corn oil (50%), Soyabean oil (53%)
│       │
│       └── Omega-3 (n-3) PUFAs
│               • Alpha-Linolenic Acid (ALA) - ESSENTIAL
│               • EPA (Eicosapentaenoic acid)
│               • DHA (Docosahexaenoic acid)
│               • Sources: Fish oil (EPA 10%), Flaxseed (ALA 53%),
│                          Mustard oil, Soyabean oil
│
└── 4. TRANS-FATTY ACIDS (TFAs)
        • Formed by partial hydrogenation of vegetable oils
        • MOST HARMFUL type of fat
        • ↓HDL, ↑LDL, ↑CHD risk (worse than SFAs)
        • Main source: Vanaspati (61% SFA + TFAs)
        • Also in: Baked goods, fried fast food

---

Essential Fatty Acids (EFA) - Key Concept

ESSENTIAL FATTY ACIDS
│
├── LINOLEIC ACID (LA) - n-6 PUFA
│       • Cannot be synthesized by humans
│       • Minimum requirement: 2.5% of total energy
│       • Precursor of Arachidonic Acid and Prostaglandins
│       • Richest source: Safflower oil (73%)
│
└── ALPHA-LINOLENIC ACID (ALA) - n-3 PUFA
        • Cannot be synthesized by humans
        • Minimum requirement: 0.5% of total energy
        • Precursor of EPA and DHA
        • Important for brain development and cardiac health
        • Sources: Flaxseed oil (53%), Mustard oil (14%)

---

Visible vs. Invisible Fats

Important Indian context: In the Indian diet, the major contribution to total fat intake is from invisible sources (cereals, pulses) rather than visible sources, because cereals and pulses constitute the bulk of Indian diet. (Park's SPM)

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ROLE / FUNCTIONS OF FATS IN THE HUMAN BODY

╔══════════════════════════════════════════════════════════════════╗
║                FUNCTIONS OF DIETARY FATS                         ║
╠══════════════════════════════════════════════════════════════════╣
║  1. ENERGY SOURCE                                                ║
║     • 1 g fat = 9 kcal (highest caloric density)                ║
║     • Most concentrated energy reserve in the body              ║
║     • Stored as triglycerides in adipose tissue                  ║
║                                                                  ║
║  2. FAT-SOLUBLE VITAMIN CARRIER                                  ║
║     • Carries and enables absorption of vitamins A, D, E, K     ║
║     • Without dietary fat → deficiency of fat-soluble vitamins  ║
║                                                                  ║
║  3. ESSENTIAL FATTY ACID SUPPLY                                  ║
║     • Only dietary fat supplies Linoleic acid (LA) and ALA       ║
║     • EFAs cannot be synthesized by the body                     ║
║                                                                  ║
║  4. STRUCTURAL COMPONENT                                         ║
║     • Phospholipids form the cell membrane bilayer               ║
║     • Myelin sheath of nerve fibres is 70% lipid                 ║
║     • Brain is 60% fat (DHA is major structural FA of brain)     ║
║                                                                  ║
║  5. SATIETY VALUE                                                ║
║     • Slows gastric emptying → prolonged sense of fullness       ║
║     • Increases palatability and flavour of food                 ║
║                                                                  ║
║  6. PRECURSOR OF HORMONES & PROSTAGLANDINS                       ║
║     • Cholesterol → steroid hormones (cortisol, sex hormones)   ║
║     • Cholesterol → bile acids (necessary for fat digestion)     ║
║     • Linoleic acid → prostaglandins, leukotrienes               ║
║                                                                  ║
║  7. INSULATION AND PROTECTION                                     ║
║     • Subcutaneous fat - thermal insulation                      ║
║     • Perirenal fat - cushions kidneys                           ║
║     • Periorbital fat - protects eyes                            ║
║                                                                  ║
║  8. SPARING EFFECT ON PROTEIN                                    ║
║     • Adequate fat in diet prevents protein being used           ║
║     • for energy (protein-sparing action)                        ║
╚══════════════════════════════════════════════════════════════════╝

---

Fats and Cardiovascular Disease - Critical Public Health Role

EFFECT OF DIFFERENT FATS ON CARDIOVASCULAR RISK

  SFAs (Saturated)  ──►  ↑ LDL cholesterol  ──►  ↑ CHD Risk
  TFAs (Trans)      ──►  ↓ HDL + ↑ LDL      ──►  ↑↑ CHD Risk (WORST)
  MUFAs             ──►  ↓ LDL, ↑ HDL       ──►  ↓ CHD Risk (GOOD)
  PUFAs (n-6)       ──►  ↓ LDL, Total Chol  ──►  ↓ CHD Risk (GOOD)
  PUFAs (n-3)       ──►  ↓ Triglycerides    ──►  ↓ CHD Risk (GOOD)
                         Anti-arrhythmic

• Total fat: 15-30% of daily energy
• SFAs: < 10% of daily energy
• PUFAs: minimum 6% of daily energy
• EFAs: LA ≥ 2.5% E, ALA ≥ 0.5% E
• TFAs: < 1% of daily energy (minimize/eliminate)
• Replacing SFAs with PUFAs decreases CHD risk
• Use combination/blend of two oils (1:1 ratio) for optimal fatty acid intake

---

Choice of Cooking Oils (ICMR Recommendation)

ICMR Recommendation: Use a blend of 2 oils (1:1 ratio) - one rich in LA + one containing ALA (e.g., sunflower + mustard/soyabean)

---

Dietary Sources of Fats

DIETARY SOURCES OF FATS
│
├── A. ANIMAL FATS (Mostly SATURATED)
│       Ghee, butter, milk, cheese, eggs,
│       meat fat, lard
│       Exception: Fish oil (rich in n-3 PUFAs - EPA/DHA)
│
├── B. VEGETABLE FATS (Mostly UNSATURATED)
│       Groundnut, mustard, sesame, coconut,
│       sunflower, soyabean, cottonseed, rice bran oils
│
└── C. INVISIBLE FATS
        Cereals (rice 3%, wheat 3%, bajra 6.5%),
        pulses, nuts, vegetables
        (Major source of fat intake in Indian diet!)

---

Fat Requirements (ICMR 2020)

---

SUMMARY FLOWCHART

DIETARY FAT
     │
     ├── CHEMICAL TYPES
     │       SFA → ↑CHD risk
     │       MUFA → Cardioprotective
     │       PUFA (n-6, n-3) → ↓CHD, EFA supply
     │       TFA → Most harmful
     │
     ├── FUNCTIONS IN BODY
     │       Energy (9 kcal/g)
     │       Vitamin A,D,E,K absorption
     │       Cell membrane structure
     │       Hormone precursor
     │       EFA supply
     │       Satiety
     │       Insulation & protection
     │
     └── PUBLIC HEALTH RELEVANCE
             Optimal: 15-30% of energy intake
             EFA: LA + ALA mandatory in diet
             Recommendation: Use blended oils
             Avoid: Vanaspati, trans fats
             India: Invisible fat = major source

---

EXAM PRESENTATION TIPS

1. Introduction + energy value
2. Chemical classification diagram (SFA / MUFA / PUFA / TFA tree)
3. Functions table (draw the box)
4. EFA concept
5. Visible vs. invisible fat
6. CVD relevance + ICMR recommendations
7. Cooking oil table

• The macronutrients/micronutrients classification box
• SFA/MUFA/PUFA/TFA classification tree
• Functions of fat box (the 8-function table)
• Effect of fat types on CHD risk (the arrow diagram)

• Fat = 9 kcal/gram
• Fat = 15-30% of daily energy (balanced diet)
• EFA minimum: LA 2.5% + ALA 0.5% of energy
• PUFAs minimum: 6% of energy
• TFAs: < 1% of energy