Nutrition and Health — MCQs

Nutrition and Health Indian Medical PG Practice Questions and MCQs

Question 61: Which of the following is used for monitoring iodine levels?

A. Urinary excretion of iodine
B. Thyroid-stimulating hormone (TSH), triiodothyronine (T3), and thyroxine (T4) levels
C. Iodine level in soil
D. All of the above (Correct Answer)

Explanation: Monitoring Iodine Deficiency Disorders (IDD) requires a multi-faceted approach that assesses the environment, dietary intake, and physiological impact. **Explanation of the Correct Answer:** The correct answer is **D (All of the above)** because iodine monitoring is conducted at three distinct levels: 1. **Urinary Iodine Excretion (UIE):** This is the **most common and sensitive indicator** for assessing the current iodine status of a population. Since >90% of dietary iodine is excreted in urine, median urinary iodine levels reflect recent dietary intake. 2. **Thyroid Function Tests (TSH, T3, T4):** These are physiological indicators. **Neonatal TSH** is a highly sensitive indicator for monitoring the impact of iodine deficiency on the developing brain. While T3 and T4 are used clinically, TSH is the primary screening tool for IDD programs. 3. **Environmental Monitoring (Soil and Water):** Iodine deficiency is primarily an ecological phenomenon. Since iodine is found in the topsoil, monitoring iodine levels in **soil and drinking water** helps identify "endemic" geographic areas where the food chain is naturally deficient. **Why individual options are part of the whole:** * **Option A** is the gold standard for population surveys. * **Option B** reflects the biological impact on the target organ (Thyroid). * **Option C** identifies the root cause of the deficiency in the food chain. **High-Yield Clinical Pearls for NEET-PG:** * **Best indicator for IDD prevalence in a community:** Prevalence of Goiter (especially in school-age children). * **Best indicator for monitoring the impact of Iodized Salt programs:** Urinary Iodine Excretion. * **Most sensitive indicator for neonatal brain damage risk:** Neonatal TSH levels. * **Iodized Salt:** Under the National Iodine Deficiency Disorders Control Programme (NIDDCP), salt must contain **30 ppm** of iodine at the production level and **15 ppm** at the consumer level.

Question 62: An egg yields approximately how many kcal of energy?

A. 50
B. 60
C. 70 (Correct Answer)
D. 80

Explanation: **Explanation:** The correct answer is **70 kcal**. In Community Medicine and Nutrition, a standard whole chicken egg (average weight of 60 grams) is considered a "reference protein" source. **1. Why 70 kcal is correct:** A standard egg typically contains approximately **6 grams of protein**, **6 grams of fat**, and negligible carbohydrates. Using the Atwater factors (4 kcal/g for protein and 9 kcal/g for fat), the calculation is: * Protein: 6g × 4 = 24 kcal * Fat: 6g × 9 = 54 kcal * Total: ~78 kcal. However, standard medical textbooks (like Park’s Preventive and Social Medicine) and nutritional guidelines approximate the energy yield of an average-sized egg to be **70 kcal**. **2. Analysis of Incorrect Options:** * **A (50 kcal):** This value is too low for a whole egg; it might represent only the egg white or a very small pullet egg. * **B (60 kcal):** While closer, this underestimates the caloric density provided by the lipids in the yolk. * **D (80 kcal):** While some large eggs can reach this value, 70 kcal is the standard "textbook" figure used for examinations. **3. High-Yield Clinical Pearls for NEET-PG:** * **Reference Protein:** Egg protein is the "Gold Standard" (Biological Value = 94) against which other proteins are compared. * **Net Protein Utilization (NPU):** For eggs, the NPU is **100**, the highest among all food sources. * **Nutrient Distribution:** The white contains mainly albumin (protein), while the yolk contains all the fat, cholesterol, and fat-soluble vitamins (A, D, E, K). * **Limiting Amino Acid:** Eggs are complete proteins and do not have a limiting amino acid, making them an ideal nutritional supplement.

Question 63: Endemic ascites is caused by which of the following?

A. Argemone mexicana seed
B. Khesari dal
C. Jhunjhunia seeds (Correct Answer)
D. Ergot poisoning

Explanation: **Explanation:** **Endemic Ascites** (also known as Veno-Occlusive Disease) is caused by the consumption of **Jhunjhunia seeds** (*Crotalaria spectabilis*). These seeds often contaminate staple crops like millet. They contain **Pyrrolizidine alkaloids** (such as monocrotaline), which are hepatotoxic. These toxins cause the narrowing and occlusion of small intrahepatic venules, leading to portal hypertension, rapid onset of ascites, and hepatomegaly. **Analysis of Options:** * **A. Argemone mexicana:** Contamination of mustard oil with these seeds causes **Epidemic Dropsy**. The toxin involved is **Sanguinarine**, which leads to widespread capillary leakage, bilateral edema, and cardiac failure, rather than isolated endemic ascites. * **B. Khesari dal (*Lathyrus sativus*):** Excessive consumption leads to **Lathyrism**, a non-inflammatory degenerative condition of the spinal cord. The toxin **BOAA** (Beta-oxalyl-amino-alanine) causes spastic paralysis of the lower limbs. * **D. Ergot poisoning:** Caused by the fungus *Claviceps purpurea* infecting food grains (like Bajra). It leads to **Ergotism**, characterized by peripheral vasoconstriction (gangrene) or neurological symptoms (convulsions), but not ascites. **High-Yield Clinical Pearls for NEET-PG:** * **Jhunjhunia Seeds:** Associated with Veno-Occlusive Disease (VOD). * **Epidemic Dropsy:** Key features include bilateral pitting edema, erythema of skin, and **Glaucoma**. * **Lathyrism:** Prevention involves "Parboiling" or soaking the dal in hot water to remove BOAA. * **Aflatoxin:** Produced by *Aspergillus flavus*; associated with groundnuts and linked to **Hepatocellular Carcinoma**.

Question 64: As per RCH II, what is the recommended Vitamin A dosage at 9 months of age?

A. 50,000 units
B. 1 lakh units (Correct Answer)
C. 1.5 lakh units
D. 2 lakh units

Explanation: **Explanation:** The Vitamin A Prophylaxis Program in India, integrated under RCH II and the National Immunization Schedule, aims to prevent nutritional blindness. Vitamin A is a fat-soluble vitamin essential for maintaining epithelial integrity and retinal function. **Why 1 Lakh Units is Correct:** The first dose of Vitamin A is administered at **9 months of age**, coinciding with the Measles/MR-1 vaccine. At this age, the recommended dose is **1 lakh International Units (IU)**, which is equivalent to 1 ml of the syrup. This lower initial dose is chosen to minimize the risk of transient side effects like bulging fontanelles in younger infants while providing sufficient stores to the liver. **Analysis of Incorrect Options:** * **A. 50,000 units:** This dose is not part of the standard prophylactic schedule for infants at 9 months. * **C. 1.5 lakh units:** There is no standard prophylactic dose of 1.5 lakh units in the national schedule. * **D. 2 lakh units:** This is the dose administered for all subsequent doses (2nd to 9th dose) starting from **18 months** of age until 5 years. **High-Yield Clinical Pearls for NEET-PG:** * **Total Doses:** A child receives a total of **9 doses** of Vitamin A by age 5. * **Cumulative Dose:** The total cumulative dose administered is **17 lakh IU** (1 lakh + [8 × 2 lakh]). * **Interval:** The minimum interval between two doses is **6 months**. * **Treatment Dose:** In cases of clinical Xerophthalmia or severe malnutrition, the treatment dose is 2 lakh IU (1 lakh for infants <6 months) given on days 0, 1, and 14. * **Post-partum:** A single dose of 2 lakh IU is recommended for mothers within 6 weeks of delivery (if not already integrated into local protocols).

Question 65: What is the amount of trisodium citrate dihydrate in WHO ORS?

A. 1.5 gm
B. 2.5 gm
C. 2.9 gm (Correct Answer)
D. 3.9 gm

Explanation: ### Explanation The correct answer is **C. 2.9 gm**. **1. Understanding the Concept: The WHO Reduced Osmolarity ORS** The World Health Organization (WHO) and UNICEF recommend a specific formulation of Oral Rehydration Salts (ORS) to manage dehydration due to diarrhea. The current standard is the **Reduced Osmolarity ORS** (total osmolarity of 245 mOsm/L). **Trisodium citrate dihydrate (2.9 gm/L)** is added to the formulation for two primary reasons: * **Correction of Acidosis:** Citrate is metabolized into bicarbonate in the body, which helps counteract metabolic acidosis caused by stool bicarbonate loss. * **Stability:** Citrate makes the ORS powder more stable in tropical climates compared to sodium bicarbonate, giving it a longer shelf life. **2. Analysis of Incorrect Options** * **A. 1.5 gm:** This is the amount of **Potassium Chloride** in the WHO ORS formulation. It is essential for replacing potassium lost in diarrheal stools. * **B. 2.5 gm:** This is the amount of **Sodium Chloride** in the WHO ORS formulation. It provides the necessary sodium for glucose-coupled sodium transport. * **D. 3.9 gm:** This is an incorrect value and does not correspond to any constituent of the standard ORS packet. **3. High-Yield Facts for NEET-PG** To excel in Community Medicine, remember the composition of one packet of WHO ORS (to be dissolved in **1 Litre** of water): | Constituent | Amount (gm/L) | | :--- | :--- | | **Sodium Chloride** | 2.6 gm (Note: 2.6, not 2.5) | | **Glucose (Anhydrous)** | 13.5 gm | | **Potassium Chloride** | 1.5 gm | | **Trisodium Citrate** | **2.9 gm** | | **Total Weight** | **20.5 gm** | * **Total Osmolarity:** 245 mOsm/L (Sodium: 75, Glucose: 75, Chloride: 65, Potassium: 20, Citrate: 10). * **Clinical Pearl:** The "Reduced Osmolarity" formula reduces stool output by 20% and the need for unscheduled IV fluids by 33% compared to the old formula.

Question 66: What is the recommended daily allowance of vitamin C in children?

A. 40 mg/d (Correct Answer)
B. 60 mg/d
C. 100 mg/d
D. 150 mg/d

Explanation: **Explanation:** The recommended daily allowance (RDA) for Vitamin C (Ascorbic Acid) is based on the guidelines provided by the **ICMR-NIN (National Institute of Nutrition)**. For children aged 1 to 12 years, the RDA is consistently set at **40 mg/day**. This intake is sufficient to maintain adequate tissue saturation and prevent clinical deficiency (Scurvy). **Why Option A is Correct:** According to the latest ICMR guidelines, the requirement for Vitamin C is 40 mg/day for children. This same value (40 mg/day) also applies to adult males and females (non-pregnant, non-lactating), making it a high-yield "common" number to remember for the exam. **Analysis of Incorrect Options:** * **B (60 mg/d):** This is the RDA for **pregnant women**. During lactation, the requirement increases further to 80 mg/d. * **C & D (100-150 mg/d):** These values are significantly higher than the physiological requirements for children. Such doses are typically reserved for therapeutic supplementation in confirmed cases of Scurvy or during severe malabsorption. **High-Yield Clinical Pearls for NEET-PG:** * **Source:** Guava is the richest source of Vitamin C, followed by Amla (Indian Gooseberry) and citrus fruits. * **Stability:** Vitamin C is the most heat-labile vitamin; it is easily destroyed by cooking and oxidation. * **Function:** It is essential for collagen synthesis (proline hydroxylation) and enhances the **absorption of non-heme iron** from the gut. * **Deficiency:** Scurvy presents with "corkscrew hair," perifollicular hemorrhages, and swollen, bleeding gums. In children, it can cause subperiosteal hemorrhage leading to "pseudoparalysis" (Barlow’s disease).

Question 67: Which of the following natural elements have anticancer properties?

A. Nitrosoamines, Vitamin D
B. Vitamin C, Vitamin D, Selenium (Correct Answer)
C. Vitamin C, Selenium
D. Nitrosoamines, Vitamin C

Explanation: ### Explanation The correct answer is **B: Vitamin C, Vitamin D, Selenium**. **1. Why the Correct Answer is Right:** The relationship between nutrition and cancer is a high-yield topic in Community Medicine. Certain micronutrients act as chemopreventive agents through various mechanisms: * **Vitamin C (Ascorbic Acid):** Acts as a potent antioxidant that neutralizes free radicals, preventing DNA damage. It also inhibits the formation of carcinogenic nitrosamines in the stomach. * **Vitamin D:** Research indicates it regulates cell growth, promotes differentiation, and induces apoptosis (programmed cell death) in potentially malignant cells. * **Selenium:** This essential trace element is a cofactor for **glutathione peroxidase**, an enzyme that protects cells from oxidative stress. Epidemiological studies have linked adequate selenium levels to a reduced risk of prostate, lung, and colorectal cancers. **2. Analysis of Incorrect Options:** * **Options A & D (Nitrosoamines):** These are potent **carcinogens**, not anticancer agents. They are found in tobacco smoke and processed meats (cured with nitrites). Including them in an "anticancer" list is factually incorrect. * **Option C (Vitamin C, Selenium):** While both are anticancer, this option is incomplete compared to Option B, which includes Vitamin D—another well-established protective element. **3. NEET-PG High-Yield Pearls:** * **Antioxidant Vitamins:** Remember the triad **A, C, and E**. * **Dietary Fibers:** High intake is protective against **Colorectal Cancer** by reducing intestinal transit time and binding carcinogens. * **Aflatoxins:** Produced by *Aspergillus flavus* (found in stored grains/groundnuts), these are major risk factors for **Hepatocellular Carcinoma**. * **Cruciferous Vegetables:** (Cabbage, Broccoli) contain indoles and isothiocyanates which are highly protective against various cancers.

Question 68: A 35-year-old pregnant female, 4 months gestation, presents for a routine checkup. Her Hb level is 11 gm/dl. What is the recommended dietary allowance for iron for this patient?

A. 40-50 mg (Correct Answer)
B. 20-25 mg
C. 15-20 mg
D. 10-15 mg

Explanation: ### Explanation **1. Why Option A is Correct:** According to the **ICMR-NIN (2020) guidelines**, the Recommended Dietary Allowance (RDA) for iron in a pregnant woman is **40 mg/day**. This is a significant increase from the requirement for a non-pregnant woman (29 mg/day). The increased demand is due to the expansion of maternal red cell mass, the needs of the growing fetus, and the development of the placenta. Since 40 mg falls within the range of **40-50 mg**, Option A is the most accurate choice. **2. Why Other Options are Incorrect:** * **Option B (20-25 mg):** This range is too low for pregnancy. It is closer to the requirement for an adult male (19 mg/day) or a post-menopausal female. * **Option C & D (10-20 mg):** These values are insufficient to prevent gestational anemia. Even a non-pregnant woman of reproductive age requires 29 mg/day to compensate for menstrual blood loss. **3. High-Yield Clinical Pearls for NEET-PG:** * **Anemia Definition in Pregnancy:** According to the WHO, anemia in pregnancy is defined as **Hb < 11 gm/dl**. This patient has a Hb of 11 gm/dl, placing her at the borderline/normal threshold. * **IFA Supplementation (National Guidelines):** Under the *Anemia Mukt Bharat* strategy, all pregnant women should receive **100 mg elemental iron and 500 µg folic acid** daily for 180 days, starting from the second trimester (13 weeks onwards). * **Iron Absorption:** Dietary iron absorption is enhanced by Vitamin C (Citrus fruits) and inhibited by phytates, oxalates, and tannins (Tea/Coffee). * **Lactation RDA:** The iron requirement during lactation actually *decreases* to **23 mg/day** (due to lactational amenorrhea) compared to the pregnant state.

Question 69: A balanced diet typically consists of what macronutrient distribution?

A. 20% proteins, 25% fats, 50% carbohydrates (Correct Answer)
B. 20% proteins, 35% fats, 45% carbohydrates
C. 25% proteins, 25% fats, 50% carbohydrates
D. 35% proteins, 15% fats, 50% carbohydrates

Explanation: **Explanation:** A balanced diet is defined as one that contains a variety of foods in such quantities and proportions that the need for energy, proteins, vitamins, minerals, and other nutrients is adequately met. According to standard nutritional guidelines (including ICMR and WHO recommendations for the general population), the ideal macronutrient distribution for a healthy adult is: * **Proteins:** 10–20% of total energy intake. * **Fats:** 20–30% of total energy intake. * **Carbohydrates:** 50–60% of total energy intake. **Option A** is the correct choice as it aligns most closely with these physiological requirements, providing a sustainable balance that prevents protein-energy malnutrition while avoiding excessive lipid intake. **Analysis of Incorrect Options:** * **Option B:** The fat content (35%) is too high. Diets exceeding 30% fat are associated with an increased risk of obesity and cardiovascular diseases. * **Option C:** While carbohydrates and fats are appropriate, 25% protein is higher than the standard requirement for a sedentary or moderately active adult (typically 0.8–1g/kg body weight). * **Option D:** 35% protein is excessively high and characteristic of therapeutic "high-protein" diets rather than a standard balanced diet for the general population. **High-Yield Clinical Pearls for NEET-PG:** * **Energy Density:** Fat provides 9 kcal/g, while Carbohydrates and Proteins provide 4 kcal/g. * **Reference Indian Adult:** The energy requirement for a sedentary male (65kg) is ~2110 kcal/day and for a sedentary female (55kg) is ~1660 kcal/day (ICMR-NIN 2020). * **Essential Fatty Acids:** Should contribute at least 3% of total energy intake. * **Dietary Fiber:** The recommended intake is about 30–40 g/day.

Question 70: Stunting indicates:

A. Acute malnutrition
B. Chronic malnutrition (Correct Answer)
C. Both acute and chronic malnutrition
D. None of the above

Explanation: ### Explanation **Correct Answer: B. Chronic Malnutrition** **Understanding the Concept:** In nutritional epidemiology, growth failure is categorized based on the relationship between height, weight, and age. **Stunting** is defined as **low height-for-age**. It occurs when a child fails to reach their linear growth potential due to long-term, cumulative deficiencies in nutrition or repeated infections. Because bone growth and height are slow-evolving processes, a deficit in height indicates a **chronic (long-term)** nutritional insult. **Analysis of Options:** * **Option A (Acute Malnutrition):** This is represented by **Wasting** (low weight-for-height). Weight is a sensitive indicator that can be lost rapidly during a short-term period of starvation or severe illness (e.g., diarrhea). * **Option C (Both acute and chronic):** This is represented by **Underweight** (low weight-for-age). Since weight is influenced by both the child's height (chronic) and their current body mass (acute), weight-for-age is a composite indicator that does not distinguish between the two. **High-Yield Clinical Pearls for NEET-PG:** 1. **Wasting:** Low Weight-for-Height → Indicates **Acute** malnutrition (Current). 2. **Stunting:** Low Height-for-Age → Indicates **Chronic** malnutrition (Past/Cumulative). 3. **Underweight:** Low Weight-for-Age → Composite indicator (Acute + Chronic). 4. **Z-Score Cut-offs:** According to WHO standards, Moderate Malnutrition is defined as a Z-score between **-2 and -3 SD**, and Severe Malnutrition is **< -3 SD**. 5. **Gomez Classification:** Uses weight-for-age to grade malnutrition. 6. **Waterlow’s Classification:** Specifically uses Wasting and Stunting to differentiate nutritional status.

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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