Nutrition and Health — MCQs

Nutrition and Health Indian Medical PG Practice Questions and MCQs

Question 71: Obesity is associated with a decreased risk of which of the following conditions?

A. Hypertension
B. Hyperuricemia
C. Osteoporosis (Correct Answer)
D. Heart disease

Explanation: **Explanation:** The correct answer is **Osteoporosis**. While obesity is a major risk factor for numerous non-communicable diseases, it is paradoxically associated with a **decreased risk** of osteoporosis and related fractures. **1. Why Osteoporosis is the Correct Answer:** The protective effect of obesity against osteoporosis is attributed to two main mechanisms: * **Mechanical Loading:** Increased body weight exerts greater mechanical stress on the skeleton, which stimulates osteoblastic activity and increases Bone Mineral Density (BMD). * **Hormonal Factors:** Adipose tissue is a site for the peripheral conversion of androgens into **estrogens** (via the enzyme aromatase). Higher circulating estrogen levels in obese individuals inhibit bone resorption and help maintain bone mass, especially in postmenopausal women. **2. Why the Other Options are Incorrect:** * **A. Hypertension:** Obesity leads to increased sympathetic nervous system activity, sodium retention, and activation of the Renin-Angiotensin-Aldosterone System (RAAS), making it a primary risk factor for high blood pressure. * **B. Hyperuricemia:** Adiposity is linked to increased production and decreased renal excretion of uric acid, often leading to gout. * **D. Heart Disease:** Obesity is a central component of Metabolic Syndrome, contributing to dyslipidemia, atherosclerosis, and coronary artery disease. **3. NEET-PG High-Yield Pearls:** * **Obesity Paradox:** While obesity protects against osteoporosis, it significantly increases the risk of **Osteoarthritis** (due to wear and tear on joints). * **Cancer Risk:** Obesity is a known risk factor for endometrial, breast (postmenopausal), and colon cancers. * **Pickwickian Syndrome:** Also known as Obesity Hypoventilation Syndrome, it is a high-yield clinical association. * **Quetelet's Index:** Another name for BMI ($weight/height^2$). Remember that for Indians, the BMI cutoff for obesity is lower ($>25 \text{ kg/m}^2$) compared to the WHO standard ($>30 \text{ kg/m}^2$).

Question 72: Endemic cretinism is seen when Iodine uptake is less than?

A. 5 micrograms/day
B. 20 micrograms/day (Correct Answer)
C. 50 micrograms/day
D. 75 micrograms/day

Explanation: **Explanation:** The correct answer is **20 micrograms/day**. **1. Underlying Medical Concept:** Iodine is essential for the synthesis of thyroid hormones (T3 and T4), which are critical for fetal brain development. According to the WHO and global epidemiological studies, **Endemic Cretinism**—characterized by irreversible mental retardation, deaf-mutism, and motor spasticity—typically appears in a population only when the environmental iodine deficiency is severe. Specifically, it manifests when the average daily iodine intake falls below **20 µg/day**. At this critical threshold, the thyroid gland can no longer maintain euthyroidism, leading to profound developmental consequences in the offspring of iodine-deficient mothers. **2. Analysis of Options:** * **A (5 µg/day):** This represents extreme deficiency, but the clinical threshold for the onset of endemic cretinism is established at the higher level of 20 µg/day. * **C & D (50 & 75 µg/day):** While these levels are below the RDA (150 µg/day), they generally result in **Goiter** (compensatory enlargement) rather than the severe neurological damage seen in cretinism. Goiter prevalence increases when intake is <50 µg/day. **3. High-Yield Clinical Pearls for NEET-PG:** * **RDA of Iodine:** 150 µg/day for adults; 250 µg/day for pregnant/lactating women. * **Iodine Deficiency Disorders (IDD) Spectrum:** Cretinism is the most severe manifestation. * **Indicators of IDD:** * **Goiter Rate:** Endemic if >5% in school-age children. * **Urinary Iodine Excretion (UIE):** The most common indicator. Normal is >100 µg/L. Severe deficiency is <20 µg/L. * **Neonatal TSH:** Best indicator for monitoring the impact of iodine prophylaxis. * **Iodized Salt:** Contains 30 ppm of iodine at the production level and 15 ppm at the consumer level.

Question 73: Consumption of polyunsaturated fatty acids (PUFA) is associated with which of the following effects on serum lipid profiles?

A. Lowering of serum cholesterol and a rise in LDL cholesterol
B. Lowering of serum cholesterol and a lowering of LDL cholesterol (Correct Answer)
C. A rise in serum cholesterol and a rise in LDL cholesterol
D. A rise in serum cholesterol and a lowering of LDL cholesterol

Explanation: **Explanation:** The correct answer is **B: Lowering of serum cholesterol and a lowering of LDL cholesterol.** **1. Underlying Medical Concept:** Polyunsaturated fatty acids (PUFAs), which include the Omega-3 and Omega-6 series, are essential fatty acids that play a crucial role in lipid metabolism. When substituted for saturated fats in the diet, PUFAs lower total serum cholesterol primarily by increasing the activity of LDL receptors in the liver. This leads to an enhanced clearance of Low-Density Lipoprotein (LDL) from the bloodstream. Additionally, PUFAs decrease the hepatic synthesis of VLDL, which is the precursor to LDL. **2. Analysis of Incorrect Options:** * **Option A & D:** These are incorrect because PUFAs are well-documented to lower LDL cholesterol, not raise it. A rise in LDL is typically associated with saturated fatty acids and trans-fats. * **Option C:** This describes the effect of saturated fatty acids (SFAs), which increase both total cholesterol and LDL levels, thereby increasing the risk of atherosclerosis. **3. NEET-PG High-Yield Clinical Pearls:** * **P/S Ratio:** The recommended Polyunsaturated to Saturated fat ratio in the diet should be **0.8 to 1.0**. * **Essential Fatty Acids:** Linoleic acid (Omega-6) and Alpha-linolenic acid (Omega-3) cannot be synthesized by the body and must be obtained from the diet. * **The "Double-Edged Sword":** While PUFAs lower LDL (good), excessive intake of Omega-6 PUFAs can also slightly lower HDL (bad). Therefore, a balance between Omega-6 and Omega-3 is vital. * **Trans-fats:** These are the most harmful lipids as they simultaneously raise LDL and lower HDL.

Question 74: Which nut contains the maximum amount of iron?

A. Pista (Correct Answer)
B. Cashew
C. Peanut
D. Walnut

Explanation: **Explanation:** In the context of nutritional medicine, nuts are dense sources of minerals, but their iron content varies significantly. **Pistachios (Pista)** are the richest source of iron among the common nuts, containing approximately **14 mg of iron per 100g**. This makes them an excellent dietary recommendation for preventing nutritional deficiency anemias. **Analysis of Options:** * **Pista (Correct):** Contains the highest iron content (~14 mg/100g). It is also rich in potassium and Vitamin B6. * **Cashew (Incorrect):** While a good source of minerals, cashews contain roughly **6.6 mg/100g** of iron, which is significantly lower than pistachios. * **Walnut (Incorrect):** Walnuts are prized for Omega-3 fatty acids (Alpha-linolenic acid) but are relatively low in iron, providing about **2.9 mg/100g**. * **Peanut (Incorrect):** Technically a legume, peanuts contain approximately **4.6 mg/100g** of iron. **High-Yield NEET-PG Pearls:** 1. **Iron Absorption:** Plant-based iron (non-heme) has lower bioavailability than animal-based iron (heme). To enhance absorption, advise patients to consume these nuts with **Vitamin C** (ascorbic acid). 2. **Richest Source Overall:** While Pista is the highest among nuts, the richest plant source of iron overall is **Green Leafy Vegetables** (specifically Amaranth) and certain seeds like **Gingelly seeds (Sesame)**. 3. **Caloric Density:** Nuts are high in fats; while they provide iron, they are also calorie-dense, which is a consideration in community nutrition programs for obesity and metabolic syndrome.

Question 75: The vitamin A supplement administered in the 'Prevention of nutritional blindness in children programme' contains:

A. 25,000 IU/ml
B. 1 Lakh IU/ml (Correct Answer)
C. 3 Lakh IU/ml
D. 5 Lakh IU/ml

Explanation: ### Explanation **1. Why 1 Lakh IU/ml is Correct:** The National Prophylaxis Programme Against Nutritional Blindness due to Vitamin A Deficiency (now integrated into the RMNCH+A strategy) uses a concentrated **oil-based solution** of Vitamin A (Retinyl palmitate). The standard formulation provided by the government is **1 Lakh IU per 1 ml**. This concentration is designed for ease of administration using a standardized 2 ml spoon: * **Infants (6–11 months):** Receive a half-spoon dose (1 ml), which equals **1 Lakh IU**. * **Children (1–5 years):** Receive a full-spoon dose (2 ml), which equals **2 Lakh IU**. **2. Why Other Options are Incorrect:** * **25,000 IU/ml:** This concentration is too low for mass prophylaxis. It would require administering 4–8 ml of oil, increasing the risk of aspiration in young children. * **3 Lakh IU/ml and 5 Lakh IU/ml:** These concentrations are excessively high. High-dose Vitamin A can lead to acute toxicity (Hypervitaminosis A), characterized by bulging fontanelles, vomiting, and increased intracranial pressure. **3. High-Yield Clinical Pearls for NEET-PG:** * **Schedule:** The first dose is given at **9 months** (with Measles/MR vaccine). Subsequent doses are given every **6 months** up to the age of 5 years. * **Total Doses:** A child receives a total of **9 doses** (1 + 8). * **Total Cumulative Dose:** 1 Lakh (1st dose) + [8 doses × 2 Lakh] = **17 Lakh IU**. * **Target Age Group:** 6 months to 5 years (though the first routine dose starts at 9 months). * **Treatment Dose:** For clinical Xerophthalmia (Bitot's spots/Night blindness), the schedule is **2 Lakh IU** orally on Day 0, Day 1, and Day 14 (Age <1 year: 1 Lakh IU).

Question 76: Cereals are deficient in which of the following micronutrients?

A. Vitamin C (Correct Answer)
B. Vitamin B complex
C. Iron
D. Calcium

Explanation: ### Explanation **Correct Option: A (Vitamin C)** Cereals (such as wheat, rice, and maize) are the staple diet in many regions but are naturally **deficient in Vitamin C (Ascorbic acid)** and Vitamin A. While cereals are excellent sources of carbohydrates and certain B vitamins, they do not contain Vitamin C in their dry state. * **High-Yield Note:** Vitamin C only appears in pulses and cereals during the process of **germination (sprouting)**. This is a frequent NEET-PG point: sprouting increases the Vitamin C and B-complex content of grains. **Analysis of Incorrect Options:** * **B. Vitamin B complex:** Cereals are actually a **rich source** of the Vitamin B complex, particularly Thiamine (B1), Riboflavin (B2), and Niacin (B3). However, excessive polishing of rice can lead to the loss of Thiamine, potentially causing Beriberi. * **C. Iron:** Cereals do contain iron, although its bioavailability is often low due to the presence of **phytates**, which inhibit absorption. * **D. Calcium:** Most cereals contain moderate amounts of calcium. Notably, **Ragi (Finger millet)** is an exceptionally rich source of calcium (344 mg/100g), making this option incorrect. **Clinical Pearls for NEET-PG:** 1. **Limiting Amino Acids:** Cereals are deficient in **Lysine** but rich in Methionine. Conversely, Pulses are deficient in Methionine but rich in Lysine. This is why a cereal-pulse combination provides "complete protein." 2. **Maize & Pellagra:** Maize is deficient in **Tryptophan** (a precursor to Niacin). Diets solely based on maize can lead to Pellagra (the 4 Ds: Dermatitis, Diarrhea, Dementia, Death). 3. **Fortification:** Because cereals are staples, they are the preferred vehicle for large-scale fortification programs (e.g., adding Iron, Folic acid, and B12 to rice/flour).

Question 77: Endemic ascites cases reported from Madhya Pradesh in 1976 were caused due to which of the following?

A. Fusarium
B. Crotalaria (Correct Answer)
C. Ergot
D. Aflatoxin

Explanation: ### Explanation The correct answer is **Crotalaria**. **1. Why Crotalaria is Correct:** The 1976 outbreak of **Endemic Ascites** in the Sarguja district of Madhya Pradesh (and parts of Maharashtra) was caused by the consumption of **Pyrrolizidine alkaloids**. These toxins were found in the seeds of the weed *Crotalaria nana* (locally known as *Jhunjhunia*), which accidentally contaminated the staple food crop, **Millet** (*Panicum miliare*). The underlying medical concept is **Veno-Occlusive Disease (VOD)**. The alkaloids cause structural damage to the smaller intrahepatic venules, leading to obstruction of hepatic venous outflow. This results in rapid-onset portal hypertension, hepatomegaly, and massive ascites. **2. Why Other Options are Incorrect:** * **A. Fusarium:** This fungus produces **T-2 toxins**, which are responsible for **Alimentary Toxic Aleukia (ATA)**. It is associated with moldy grain and causes bone marrow suppression, not endemic ascites. * **C. Ergot:** Caused by *Claviceps purpurea* infecting Bajra or Rye. It leads to **Ergotism**, characterized by symptoms like vomiting, giddiness, and peripheral gangrene due to vasoconstriction. * **D. Aflatoxin:** Produced by *Aspergillus flavus* (commonly in stored groundnuts/maize). Chronic exposure leads to **Hepatocellular Carcinoma (HCC)** or acute hepatitis, but it was not the cause of the 1976 Madhya Pradesh outbreak. **3. High-Yield Clinical Pearls for NEET-PG:** * **Epidemic Dropsy:** Caused by **Argemone mexicana** (Sanguinarine toxin) contaminating mustard oil. It presents with bilateral pitting edema and cardiac failure. * **Lathyrism:** Caused by **BOAA** (Beta-oxalyl-amino-alanine) in *Lathyrus sativus* (Khesari Dal), leading to spastic paraplegia. * **Veno-Occlusive Disease (VOD):** Always associate "Endemic Ascites" + "Madhya Pradesh" + "Crotalaria" for exam questions.

Question 78: What is the recommended daily calcium intake for an infant in mg/day?

A. 100
B. 200
C. 300
D. 500 (Correct Answer)

Explanation: **Explanation:** The correct answer is **500 mg/day**. This value is based on the **ICMR-NIN (2020) Dietary Guidelines** for Indians, which are high-yield for NEET-PG. **Underlying Medical Concept:** Calcium is critical during infancy for rapid skeletal mineralization and neuromuscular function. While breast milk is the primary source of calcium for infants, the Recommended Dietary Allowance (RDA) is set to ensure adequate accretion during this peak growth phase. According to the latest ICMR-NIN guidelines, the RDA for calcium is uniform for infants aged **0–12 months at 500 mg/day**. **Analysis of Options:** * **A (100 mg) & B (200 mg):** These values are significantly below the physiological requirement for an infant's bone development and do not meet the RDA standards. * **C (300 mg):** While older guidelines or international standards (like the US-IOM) might suggest lower Adequate Intake (AI) levels for 0-6 months (approx. 200-260 mg), the **Indian (ICMR) standard** specifically mandates 500 mg/day to account for local dietary patterns and bioavailability. * **D (500 mg):** This is the current recommended value for both 0–6 months and 6–12 months categories in India. **High-Yield Clinical Pearls for NEET-PG:** * **Calcium RDA for Children (1–9 years):** 600 mg/day. * **Calcium RDA for Adolescents (10–18 years):** 1050 mg/day (Highest requirement due to pubertal growth spurt). * **Calcium RDA for Pregnant & Lactating Women:** 1000 mg/day. * **Calcium:Phosphorus Ratio:** The ideal ratio in the diet should be **1:1** (except in infancy where it is 1:1.5). * **Vitamin D:** Essential for calcium absorption; the RDA for all age groups (including infants) is **600 IU/day** (15 μg).

Question 79: Which food source has the highest protein energy ratio?

A. Egg
B. Wheat
C. Milk
D. Fish (Correct Answer)

Explanation: **Explanation:** The **Protein-Energy Ratio (PE Ratio)** is the proportion of total energy (calories) in a food item that is derived from protein. It is calculated as: *(Energy from protein / Total energy in the food) × 100*. **Why Fish is the Correct Answer:** Fish is considered the richest source in terms of PE ratio among the given options. Most varieties of fish (especially white fish) are exceptionally high in high-biological-value protein while being very low in carbohydrates and fats. This results in a high percentage of its total caloric content coming from protein. In clinical nutrition, fish is often cited as having a PE ratio significantly higher than cereals or dairy. **Analysis of Incorrect Options:** * **Egg:** While eggs have the highest **Biological Value (100)** and are the "Reference Protein," they also contain a significant amount of fat (in the yolk). This added fat increases the total energy content, thereby lowering the PE ratio compared to lean fish. * **Milk:** Milk contains a balanced mix of proteins, carbohydrates (lactose), and fats. Because of the high sugar and fat content relative to its protein, its PE ratio is lower than that of flesh foods. * **Wheat:** As a cereal, wheat is primarily a carbohydrate source. Although it contains some protein (gluten), its energy is predominantly derived from starch, leading to a low PE ratio. **High-Yield NEET-PG Pearls:** * **Reference Protein:** Egg (used as a standard for comparing other proteins). * **Highest Biological Value (BV):** Egg (100), followed by Milk (95). * **Net Protein Utilization (NPU):** Highest for Egg (94). * **Limiting Amino Acids:** Wheat is limited in **Lysine**; Pulses are limited in **Methionine**. * **Pulse-Cereal Mix:** The ideal ratio to achieve a balanced amino acid profile is **1:4**.

Question 80: What is the normal range for the Corpulence Index?

A. Less than 1.2 (Correct Answer)
B. Greater than 1.2
C. 2.2
D. Less than 0.2

Explanation: **Explanation:** The **Corpulence Index** (also known as Rohrer's Index or Ponderal Index) is a measure used to assess physical leanness or obesity, particularly in children and adolescents. It is calculated using the formula: **Corpulence Index = [Weight (kg) / Height (m)³]** **1. Why Option A is Correct:** In clinical nutrition and anthropometry, a Corpulence Index of **less than 1.2** is considered the normal physiological range. This index is often preferred over BMI in pediatric populations because it remains more constant during growth, as it accounts for the cubic relationship between weight and height. **2. Why the Other Options are Incorrect:** * **Option B (Greater than 1.2):** Values exceeding 1.2 generally indicate overnutrition, overweight, or obesity. * **Option C (2.2):** This value is significantly high and would represent severe obesity or pathological weight gain. * **Option D (Less than 0.2):** This value is physiologically impossible for a living human being, as it would indicate extreme emaciation incompatible with life. **3. High-Yield NEET-PG Pearls:** * **BMI vs. Corpulence Index:** While BMI (kg/m²) is the gold standard for adults, the Corpulence Index (kg/m³) is more accurate for neonates and short-statured individuals. * **Quetelet’s Index:** This is another name for the Body Mass Index (BMI). * **Ponderal Index in Neonates:** It is frequently used to differentiate between **Symmetric** (low PI) and **Asymmetric** (normal PI) Intrauterine Growth Restriction (IUGR). * **Broca’s Index:** A quick bedside formula for Ideal Body Weight: [Height (cm) – 100].

Practice by Chapter

Basic Nutritional Requirements

Practice Questions

Assessment of Nutritional Status

Practice Questions

Protein-Energy Malnutrition

Practice Questions

Micronutrient Deficiencies

Practice Questions

Nutritional Programs in India

Practice Questions

Dietary Guidelines

Practice Questions

Food Safety and Security

Practice Questions

Diet and Non-Communicable Diseases

Practice Questions

Nutrition in Pregnancy and Lactation

Practice Questions

Infant and Young Child Nutrition

Practice Questions

Nutrition in Emergencies

Practice Questions

Food Fortification and Supplementation

Practice Questions

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