Nutrition and Health — MCQs

Nutrition and Health Indian Medical PG Practice Questions and MCQs

Question 401: What is the recommended daily zinc supplementation for a 12-month-old baby?

A. 1 gm/day
B. 10 mg/day
C. 5 mg/day (Correct Answer)
D. 15 mg/day

Explanation: **Explanation:** The correct answer is **5 mg/day**. This recommendation is based on the **Revised National Iron Plus Initiative (NIPI)** and the **ICMR-NIN (2020) Dietary Reference Intakes** for the Indian population. **1. Why 5 mg/day is correct:** For infants aged **6 to 12 months**, the Recommended Dietary Allowance (RDA) for zinc is **5 mg/day**. Zinc is a critical micronutrient for cellular metabolism, immune function, and linear growth. In the context of public health in India, this dosage is specifically emphasized to prevent growth faltering and reduce the incidence of infectious diseases like diarrhea and pneumonia in late infancy. **2. Analysis of Incorrect Options:** * **10 mg/day (Option B):** This is the RDA for children aged **1–9 years**. It is also the therapeutic dose used for infants *under* 6 months of age during an acute episode of diarrhea (for 14 days). * **20 mg/day (Not listed, but relevant):** This is the therapeutic dose for children *over* 6 months of age during diarrhea management. * **15 mg/day (Option D):** This exceeds the RDA for all pediatric age groups and is closer to the requirement for pregnant or lactating women (12–14 mg/day). * **1 gm/day (Option A):** This is a toxic dose; zinc is a micronutrient required in milligram quantities. **3. High-Yield Clinical Pearls for NEET-PG:** * **Diarrhea Management:** Zinc supplementation (20 mg for >6 months; 10 mg for <6 months) for 14 days reduces the duration and severity of diarrhea and prevents future episodes for 2–3 months. * **Deficiency Sign:** **Acrodermatitis enteropathica** (periorificial and acral dermatitis, alopecia, and diarrhea) is the classic clinical presentation of severe zinc deficiency. * **Absorption:** Phytates (found in cereals) inhibit zinc absorption, while animal proteins enhance it.

Question 402: Riboflavin deficiency is not associated with which of the following?

A. Alcohol
B. Protein-energy malnutrition (PEM)
C. Chronic vomiting
D. Fat malabsorption (Correct Answer)

Explanation: **Explanation:** Riboflavin (Vitamin B2) is a **water-soluble vitamin**. Unlike fat-soluble vitamins (A, D, E, and K), its absorption is not dependent on bile salts or micelle formation. Therefore, **fat malabsorption** (Option D) does not significantly impair the absorption of Riboflavin, making it the correct answer. **Analysis of other options:** * **Alcohol (Option A):** Chronic alcoholism is a major cause of riboflavin deficiency. Alcohol interferes with the digestion and absorption of riboflavin and inhibits its conversion into its active coenzyme forms (FMN and FAD). * **Protein-Energy Malnutrition (Option B):** Riboflavin deficiency often coexists with PEM. In states of severe protein deficiency, the carrier proteins required for vitamin transport are diminished, and the overall dietary intake of B-complex vitamins is usually inadequate. * **Chronic Vomiting (Option C):** Persistent vomiting leads to a general state of malabsorption and excessive loss of water-soluble vitamins before they can be adequately processed in the small intestine. **Clinical Pearls for NEET-PG:** * **Clinical Features:** Riboflavin deficiency is characterized by the **"Oral-Ocular-Genital Syndrome"** (Angular stomatitis, Cheilosis, Glossitis/Magenta tongue, Corneal vascularization, and Scrotal/Vulval dermatitis). * **Biochemical Marker:** The most sensitive test for riboflavin status is the measurement of **Erythrocyte Glutathione Reductase Activity (EGRA)**. * **Sources:** The richest source is yeast; however, in the Indian diet, **milk and milk products** are the most important sources. It is also synthesized by intestinal bacteria, though not in sufficient quantities.

Question 403: Which of the following glycoproteins has both lubricant and protective action?

A. Mucin (Correct Answer)
B. Immunoglobulin
C. Collagen
D. Albumin

Explanation: **Explanation:** **Correct Option: A (Mucin)** Mucins are high-molecular-weight, heavily glycosylated proteins (glycoproteins) produced by epithelial tissues. They are the primary constituents of mucus. * **Lubricant Action:** Due to their high carbohydrate content, they trap water, forming a viscous gel that reduces friction during swallowing, digestion, and movement of mucosal surfaces. * **Protective Action:** They form a physical barrier against pathogens, toxins, and mechanical injury. In the stomach, mucin protects the gastric mucosa from acid-pepsin digestion. **Incorrect Options:** * **B. Immunoglobulin:** These are glycoproteins that function as antibodies (immune defense). While they provide protection by neutralizing pathogens, they do not possess lubricating properties. * **C. Collagen:** This is a structural fibrous protein (not primarily a glycoprotein in this functional context) that provides tensile strength to connective tissues like skin, bone, and cartilage. * **D. Albumin:** This is a simple protein (not a glycoprotein) synthesized by the liver. Its primary roles include maintaining oncotic pressure and transporting hormones, drugs, and bilirubin. **High-Yield Clinical Pearls for NEET-PG:** * **Mucin in Pathology:** Overexpression of mucins (like MUC1) is often seen in adenocarcinomas (e.g., breast, pancreatic, and colon cancer) and is used as a tumor marker. * **Vitamin A Connection:** Vitamin A deficiency leads to "Squamous Metaplasia," where mucus-secreting epithelium is replaced by keratinized epithelium, leading to a loss of these lubricant/protective functions (e.g., Xerophthalmia). * **Steatocit:** Mucin is secreted by **Goblet cells** in the intestinal and respiratory tracts.

Question 404: Epidemic dropsy is due to?

A. BOAA
B. Aflatoxin
C. Argemone oil (Correct Answer)
D. None of the above

Explanation: **Explanation:** **Epidemic Dropsy** is a clinical condition caused by the consumption of mustard oil adulterated with **Argemone mexicana (Prickly Poppy) oil**. 1. **Why Argemone oil is correct:** Argemone seeds resemble mustard seeds and are often used as cheap adulterants. The oil contains a toxic alkaloid called **Sanguinarine**. This toxin interferes with oxidation-reduction reactions and causes extensive capillary leakage and dilatation. This leads to the characteristic clinical triad of sudden bilateral pitting edema (dropsy), gastrointestinal disturbances, and cutaneous erythema. A serious complication is **Glaucoma**, which can lead to blindness. 2. **Why other options are incorrect:** * **BOAA (Beta-Oxalyl-Amino-Alanine):** This neurotoxin is found in *Lathyrus sativus* (Khesari dal). It causes **Lathyrism**, a condition characterized by spastic paraplegia, not dropsy. * **Aflatoxin:** Produced by the fungus *Aspergillus flavus*, it contaminates stored grains like groundnuts and maize. It is primarily associated with **Hepatocellular Carcinoma** and acute hepatitis, not epidemic dropsy. **High-Yield Clinical Pearls for NEET-PG:** * **Toxic Alkaloid:** Sanguinarine (and Dihydrosanguinarine). * **Diagnostic Test:** **Nitric Acid Test** (gives a brownish-red color) or Paper Chromatography (most sensitive). * **Key Complication:** Glaucoma (due to increased production of aqueous humor). * **Treatment:** Immediate removal of the adulterated oil and a high-protein, Vitamin C, and E enriched diet. * **Endemic Areas:** Frequently reported in North and Central India (West Bengal, Bihar, UP).

Question 405: Which of the following statements about Recommended Daily Allowance (RDA) is false?

A. The RDA is decided by a panel of experts and is based on scientific research.
B. The RDA caters to the dietary requirement of all people. (Correct Answer)
C. The RDA is often higher than the recommended minimum requirement.
D. The RDA is based on the Estimated Average Requirement (EAR).

Explanation: ### Explanation **Why Option B is the Correct Answer (The False Statement):** The Recommended Daily Allowance (RDA) is defined as the average daily dietary nutrient intake level that is sufficient to meet the nutrient requirements of nearly all (**97–98%**) healthy individuals in a particular life stage and gender group. It does **not** cater to "all" people because it excludes individuals with specific clinical conditions, metabolic disorders, or chronic illnesses who may have significantly higher or lower requirements. Therefore, stating it caters to "all people" is technically incorrect in a medical context. **Analysis of Other Options:** * **Option A:** Correct. RDAs are formulated by expert committees (like ICMR-NIN in India) based on rigorous scientific data regarding nutrient metabolism and deficiency prevention. * **Option C:** Correct. The RDA is intentionally set higher than the minimum requirement to provide a "safety margin" that accounts for individual variations and ensures that the needs of the vast majority of the population are met. * **Option D:** Correct. The mathematical formula for RDA is **RDA = EAR + 2 SD** (Standard Deviation). The Estimated Average Requirement (EAR) meets the needs of 50% of the population; the RDA builds upon this to cover 97.5%. **High-Yield Clinical Pearls for NEET-PG:** * **RDA Formula:** RDA = EAR + 2 SD (Standard Deviation of the requirement). * **Energy Exception:** For **Energy (Calories)**, the RDA is set exactly at the **EAR**. This is to prevent overconsumption and the subsequent risk of obesity. * **Reference Indian Adult:** The 2020 ICMR-NIN guidelines define the reference man and woman as aged **19–39 years** with a body weight of **65 kg** and **55 kg**, respectively. * **Safe Intake:** For nutrients like proteins and vitamins, the RDA is the "Safe Level of Intake."

Question 406: What is the net protein utilization of egg?

A. 96 (Correct Answer)
B. 81
C. 79
D. 45-50

Explanation: **Explanation:** The correct answer is **96**. Net Protein Utilization (NPU) is a measure of protein quality that represents the proportion of dietary protein retained by the body. It is calculated as: *NPU = (Nitrogen Retained / Nitrogen Intake) × 100.* Egg protein is considered the **"Reference Protein"** in human nutrition because it contains all essential amino acids in the ideal proportions required by the human body. It has the highest NPU among all natural foods, making it the gold standard for comparing the quality of other proteins. **Analysis of Options:** * **Option A (96):** This is the standard NPU value for a whole egg. Because of its near-perfect digestibility and amino acid profile, almost all the protein consumed is utilized for tissue building. * **Option B (81):** This is the approximate NPU for **Milk**. While high, it is slightly lower than egg due to different amino acid concentrations. * **Option C (79):** This is the approximate NPU for **Meat/Fish**. Animal muscle proteins are high quality but slightly less efficient in utilization compared to eggs. * **Option D (45-50):** This range represents the NPU of many **Vegetable proteins** (e.g., pulses, Bengal gram). Most plant proteins are "incomplete" as they lack one or more essential amino acids (limiting amino acids). **High-Yield Pearls for NEET-PG:** 1. **Biological Value (BV):** For Egg is **94** (Note: NPU = BV × Digestibility coefficient). 2. **Protein Efficiency Ratio (PER):** For Egg is **4.5**. 3. **Limiting Amino Acids:** Pulses are deficient in **Methionine**, while Cereals are deficient in **Lysine**. 4. **Reference Protein:** Egg is used as the reference protein because its amino acid score is **100**.

Question 407: Which of the following can cause lathyrism?

A. Khesari dal (Correct Answer)
B. Moong dal
C. Chana dal
D. Masoor dal

Explanation: **Explanation:** **Lathyrism** is a non-fungal nutritional toxicoses caused by the excessive consumption of **Khesari dal (*Lathyrus sativus*)**. This pulse contains a potent neurotoxin known as **BOAA (Beta-oxalyl-amino-alanine)**, also referred to as ODAP. When Khesari dal constitutes more than 30% of the total calorie intake over a period of 2–6 months, it leads to **Neurolathyrism**, characterized by spastic paraplegia. * **Why Khesari dal is correct:** It is a hardy, drought-resistant crop often consumed by landless laborers during famines. The BOAA toxin causes the death of upper motor neurons, leading to a characteristic "scissor gait." * **Why other options are wrong:** Moong dal, Chana dal, and Masoor dal are common edible pulses consumed across India. They do not contain neurotoxic amino acids like BOAA and are safe for human consumption as primary protein sources. **High-Yield Clinical Pearls for NEET-PG:** 1. **Stages of Lathyrism:** * *Latent stage:* No symptoms, but positive "Treadmill test." * *No-stick stage:* Short steps, jerky gait. * *One-stick/Two-stick stage:* Progressive difficulty in walking. * *Crawler stage:* Permanent disability; the patient can only crawl. 2. **Prevention:** * **Steeping method:** Soaking dal in hot water (removes 90% of toxin). * **Parboiling:** Similar to rice processing. * **Banning:** The sale of Khesari dal was historically banned in many Indian states to prevent outbreaks. 3. **Target Population:** Most commonly affects young adult males (15–45 years).

Question 408: Which of the following oils contains the maximum amount of unsaturated fatty acids?

A. Mustard oil
B. Groundnut oil
C. Safflower oil (Correct Answer)
D. Coconut oil

Explanation: ### Explanation **1. Why Safflower Oil is Correct:** The nutritional quality of dietary fats is often determined by the ratio of saturated to unsaturated fatty acids. **Safflower oil** contains the highest concentration of unsaturated fatty acids (approximately **90-94%**), specifically Polyunsaturated Fatty Acids (PUFA). It is exceptionally rich in **Linoleic acid** (an omega-6 essential fatty acid), making it a potent agent for lowering serum cholesterol levels. In the context of NEET-PG, it is frequently cited as the gold standard for high PUFA content. **2. Why Other Options are Incorrect:** * **Mustard Oil:** While it is low in saturated fats, it contains high amounts of **Monounsaturated Fatty Acids (MUFA)** and is notable for its **Erucic acid** content. Its total unsaturated fat percentage is lower than safflower oil. * **Groundnut Oil:** This is a balanced oil containing roughly 19% saturated fats and 81% unsaturated fats (primarily MUFA/Oleic acid). While healthy, its unsaturated fraction does not reach the levels found in safflower. * **Coconut Oil:** This is the most "saturated" of all edible oils, containing about **92% Saturated Fatty Acids**. It is a medium-chain triglyceride (MCT) source but is the opposite of what the question asks for. **3. High-Yield Clinical Pearls for NEET-PG:** * **Highest PUFA Content:** Safflower oil (73-75% Linoleic acid; ~90% total unsaturated). * **Highest MUFA Content:** Olive oil (followed by Groundnut and Mustard oil). * **Highest Saturated Fat:** Coconut oil (92%) > Palm kernel oil. * **Essential Fatty Acids (EFA):** Safflower oil is the richest source of Linoleic acid (Omega-6), while Flaxseed/Linseed oil is the richest source of Alpha-linolenic acid (Omega-3). * **P/S Ratio:** The recommended Polyunsaturated to Saturated fat ratio for a healthy diet is **0.8 – 1.0**.

Question 409: Cereals and pulses are considered complementary in terms of protein content because?

A. Cereals are deficient in methionine.
B. Cereals are deficient in methionine, and pulses are deficient in lysine.
C. Cereals are deficient in lysine, and pulses are deficient in methionine. (Correct Answer)
D. Cereal proteins contain primarily non-essential amino acids, while pulse proteins contain essential amino acids.

Explanation: **Explanation:** The concept of **supplementary action of proteins** (or mutual supplementation) is a high-yield topic in Community Medicine. It refers to the practice of combining two or more plant proteins to provide a complete profile of essential amino acids. **1. Why Option C is Correct:** Proteins are made of amino acids. Most plant-based proteins are "incomplete" because they lack one or more essential amino acids (limiting amino acids). * **Cereals** (e.g., rice, wheat, maize) are generally rich in methionine and cysteine but **deficient in Lysine**. * **Pulses** (e.g., lentils, beans, peas) are rich in lysine but **deficient in Methionine** (and other sulfur-containing amino acids). When consumed together (e.g., *Dal-Chawal* or *Khichdi*), the deficiency of one is compensated by the other, resulting in a protein mixture with a biological value comparable to animal protein. **2. Analysis of Incorrect Options:** * **Option A & B:** These are partially incorrect or reversed. Cereals are not deficient in methionine; they are the primary source of it in a vegetarian diet. Pulses are the ones deficient in methionine. * **Option D:** Both cereals and pulses contain essential amino acids; the issue is not the absence of essential amino acids entirely, but rather the *limiting* quantity of specific ones. **3. NEET-PG High-Yield Pearls:** * **Limiting Amino Acid in Maize:** Tryptophan (leads to Pellagra due to Niacin deficiency). * **Limiting Amino Acid in Rice/Wheat:** Lysine. * **Limiting Amino Acid in Pulses:** Methionine. * **Reference Protein:** Egg protein is considered the "standard" or reference protein (Biological Value = 100) against which others are compared. * **Net Protein Utilization (NPU):** This is the best indicator of protein quality; for eggs it is 100, for milk 75, and for pulses ~45-55.

Question 410: What is the daily recommended dose of iron for an adolescent female?

A. 1.8 mg/d
B. 2.4 mg/d (Correct Answer)
C. 3.4 mg/d
D. 4.0 mg/d

Explanation: The correct answer is **B. 2.4 mg/d**. ### **Educational Explanation** **1. Understanding the Correct Answer (2.4 mg/d):** The recommended dietary allowance (RDA) for iron is based on the physiological requirement to balance losses and support growth. For an adolescent female, the requirement is significantly higher than for males due to the onset of menstruation (menarche) and the rapid expansion of blood volume during the pubertal growth spurt. According to the **ICMR-NIN (2020) guidelines**, the physiological requirement for iron in adolescent girls (13–15 years) is approximately **2.4 mg/day**. This value represents the amount of iron that must be *absorbed* and utilized by the body to maintain health. **2. Analysis of Incorrect Options:** * **A. 1.8 mg/d:** This is closer to the requirement for an adolescent male (approx. 1.9–2.1 mg/d). Males lack the additional iron loss associated with menstruation. * **C. 3.4 mg/d & D. 4.0 mg/d:** These values exceed the physiological requirement for non-pregnant adolescents. However, requirements can spike to these levels (or higher) during the second and third trimesters of pregnancy to support fetal development. ### **High-Yield Clinical Pearls for NEET-PG** * **Anemia Mukt Bharat (AMB) Strategy:** While the *physiological* requirement is ~2.4 mg/d, the *prophylactic* dose under the AMB for adolescents (10–19 years) is **60 mg elemental iron and 500 mcg Folic Acid** once weekly (WIFS). * **Bioavailability:** In Indian diets, iron absorption is low (approx. 5–8%). Therefore, the *dietary intake* must be much higher (approx. 30–32 mg/day) to achieve the *physiological absorption* of 2.4 mg/day. * **Vitamin C:** Always counsel patients to take iron with Vitamin C (citrus fruits) to enhance absorption and avoid tea/coffee, which contain phytates/tannins that inhibit it.

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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