Nutrition and Health — MCQs

Nutrition and Health Indian Medical PG Practice Questions and MCQs

Question 441: Zinc deficiency leads to all of the following except:

A. Delayed skeletal maturation
B. Impaired immune system
C. Skeletal abnormalities
D. Excessive appetite (Correct Answer)

Explanation: **Explanation:** Zinc is an essential trace element required for the function of over 300 enzymes, playing a critical role in protein synthesis, cell division, and nucleic acid metabolism. **Why "Excessive Appetite" is the correct answer:** Zinc deficiency is classically associated with **hypogeusia** (loss of taste) and **anorexia** (loss of appetite), rather than an excessive appetite. Zinc is vital for the function of gustin, a salivary protein necessary for the development of taste buds. Therefore, a deficiency leads to a marked reduction in food intake. **Analysis of Incorrect Options:** * **Delayed skeletal maturation:** Zinc is essential for osteoblast activity and collagen synthesis. Deficiency leads to growth retardation and delayed bone age, a hallmark finding in pediatric zinc deficiency. * **Impaired immune system:** Zinc is crucial for T-lymphocyte function and cell-mediated immunity. Deficiency leads to thymic atrophy and increased susceptibility to infections (especially diarrhea and pneumonia). * **Skeletal abnormalities:** Chronic deficiency interferes with normal bone mineralization and longitudinal growth, leading to stunting and various structural skeletal defects. **NEET-PG High-Yield Pearls:** 1. **Acrodermatitis Enteropathica:** An autosomal recessive disorder of zinc absorption characterized by the triad of **alopecia, diarrhea, and vesiculobullous dermatitis** (periorificial and acral). 2. **Hypogonadism:** Zinc deficiency is a known cause of delayed sexual maturation and oligospermia. 3. **Wound Healing:** Zinc is a cofactor for RNA and DNA polymerase; deficiency leads to poor wound healing. 4. **Diarrhea Management:** WHO recommends 20 mg of Zinc daily for 10–14 days (10 mg for infants <6 months) during acute diarrhea to reduce severity and recurrence.

Question 442: All of the following statements are true regarding colostrum or breast milk except?

A. Vitamin D is the most abundant vitamin in breast milk. (Correct Answer)
B. Taurine is an amino acid present which is required for brain development.
C. In comparison to cow's milk, human breast milk has higher lactose, iron, and calcium-phosphate ratio.
D. IgA is present in high quantities in breast milk.

Explanation: **Explanation** The correct answer is **A** because it is a false statement. **Vitamin D is actually deficient in breast milk.** While breast milk is the "gold standard" for infant nutrition, it contains very low levels of Vitamin D (approx. 20-40 IU/L). Consequently, the WHO and IAP recommend routine Vitamin D supplementation (400 IU/day) for all breastfed infants to prevent rickets. The most abundant vitamin in breast milk is **Vitamin A**. **Analysis of other options:** * **Option B:** Taurine and Cysteine are essential amino acids for neonates (especially preterm) as they lack the enzymes to synthesize them. Taurine is critical for **brain development** and bile acid conjugation. * **Option C:** Human milk contains **higher Lactose** (7g% vs 4g% in cow's milk) which facilitates calcium absorption and brain growth. Although the absolute quantity of iron is low, its **bioavailability** is much higher (50-70%) compared to cow's milk. The **Calcium-Phosphate ratio** is higher in human milk (2:1), which prevents hypocalcemic tetany. * **Option D:** Colostrum is rich in **Secretory IgA**, which provides local mucosal immunity in the infant's gut against enteric pathogens. **High-Yield Clinical Pearls for NEET-PG:** * **Energy Value:** Breast milk provides **67 kcal/100 ml**. * **Proteins:** Human milk is **Whey-dominant** (60:40 ratio), making it easier to digest than the Casein-dominant cow's milk. * **Deficiencies:** Breast milk is notoriously deficient in **Vitamin D, Vitamin K, and Iron** (quantity-wise). * **Colostrum:** Secreted during the first 2-3 days; it is thick, yellow, and rich in fat-soluble vitamins (A, D, E, K) and antibodies.

Question 443: What is the recommended daily iodine intake for pregnant women?

A. 75 mcg
B. 100 mcg
C. 150 mcg
D. 250 mcg (Correct Answer)

Explanation: **Explanation:** The correct answer is **250 mcg**. Iodine is a critical micronutrient required for the synthesis of thyroid hormones (T3 and T4), which are essential for fetal neurodevelopment and metabolic regulation. **Why 250 mcg is correct:** During pregnancy, iodine requirements increase significantly due to: 1. Increased maternal T4 production to maintain euthyroidism. 2. Transfer of iodine to the fetus (especially after the 12th week when the fetal thyroid begins functioning). 3. An increase in the glomerular filtration rate (GFR), leading to higher urinary iodine excretion. The **WHO (World Health Organization)** and **UNICEF** recommend a daily intake of **250 mcg** for both pregnant and lactating women to prevent Iodine Deficiency Disorders (IDD) like cretinism and cognitive impairment. **Analysis of Incorrect Options:** * **A (75 mcg):** This is insufficient for any age group and falls below the requirement for infants (90 mcg). * **B (100 mcg):** This is the approximate requirement for children (aged 0–5 years). * **C (150 mcg):** This is the standard RDA for **adolescents and non-pregnant adults**. While it is the baseline for the general population, it is inadequate for the increased physiological demands of pregnancy. **High-Yield Clinical Pearls for NEET-PG:** * **Indicator of Iodine Status:** The best epidemiological indicator for iodine status in a community is **Median Urinary Iodine Excretion (MUIE)**. For pregnant women, a MUIE of **150–249 μg/L** indicates adequate intake. * **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. * **Consequence of Deficiency:** Maternal iodine deficiency is the most common cause of **preventable mental retardation** worldwide.

Question 444: Which vitamin deficiency disease is commonly seen in populations that primarily consume maize?

A. Beriberi
B. Megaloblastic anemia
C. Pellagra (Correct Answer)
D. Night blindness

Explanation: **Explanation:** The correct answer is **Pellagra**, which is caused by a deficiency of **Niacin (Vitamin B3)**. This condition is classically associated with maize-based diets due to two primary reasons: 1. **Low Tryptophan:** Maize is deficient in Tryptophan, an essential amino acid that serves as a precursor for the endogenous synthesis of Niacin in the body. 2. **Bound Niacin (Niacytin):** The niacin present in maize is in a bound form called 'Niacytin,' which is biologically unavailable for absorption in the human gut. **Analysis of Incorrect Options:** * **Beriberi (Vitamin B1/Thiamine deficiency):** This is typically associated with populations consuming **polished rice**, where the thiamine-rich outer bran layer is removed. * **Megaloblastic Anemia:** This results from a deficiency of **Vitamin B12 or Folic acid**, often seen in strict vegetarians or those with malabsorption syndromes, but not specifically linked to maize. * **Night Blindness (Vitamin A deficiency):** This is the earliest symptom of Xerophthalmia, usually caused by inadequate intake of green leafy vegetables, yellow fruits, or animal products. **High-Yield Clinical Pearls for NEET-PG:** * **The 4 D’s of Pellagra:** Dermatitis (Casal’s necklace distribution), Diarrhea, Dementia, and Death. * **Amino Acid Link:** 60 mg of Tryptophan yields 1 mg of Niacin. * **Jowar Connection:** Pellagra is also seen in populations consuming **Jowar (Sorghum)** because it contains high levels of **Leucine**, which interferes with the conversion of Tryptophan to Niacin. * **Nixtamalization:** Traditional alkaline treatment of maize (using lime) releases bound niacin, preventing pellagra in certain cultures.

Question 445: A 35-year-old moderately active man burns how many kilocalories per day?

A. 1500 kcal/d
B. 2500 kcal/d (Correct Answer)
C. 3500 kcal/d
D. 4000 kcal/d

Explanation: This question tests your knowledge of the **ICMR-NIN (2020) Guidelines** for Nutrient Requirements for Indians, which is a high-yield topic for NEET-PG. ### **Explanation of the Correct Answer** The energy requirement for an adult male is categorized based on physical activity levels: Sedentary, Moderate, and Heavy. According to the latest ICMR-NIN guidelines: * **Sedentary Work:** 2110 kcal/day * **Moderate Work:** **2710 kcal/day** (The closest option provided is **2500 kcal/day**, which aligns with older ICMR standards often still used in exams). * **Heavy Work:** 3470 kcal/day For a 35-year-old man (Reference body weight: 65 kg) engaged in moderate activity (e.g., a plumber, servant, or someone walking frequently), the energy expenditure falls in the range of 2500–2700 kcal/day. ### **Analysis of Incorrect Options** * **A (1500 kcal/d):** This is too low for a healthy adult male; it is closer to the Basal Metabolic Rate (BMR) or the requirement for a sedentary elderly female. * **C (3500 kcal/d):** This corresponds to the requirement for a man performing **Heavy Work** (e.g., stone cutters, blacksmiths, or rickshaw pullers). * **D (4000 kcal/d):** This exceeds the standard requirements for most occupations and would only be seen in elite athletes or exceptionally strenuous labor. ### **High-Yield Clinical Pearls for NEET-PG** 1. **Reference Indian Man:** Age 19–39 years, weight **65 kg**, BMI 18.5–22.9. 2. **Reference Indian Woman:** Age 19–39 years, weight **55 kg**. 3. **Pregnancy:** Add **+350 kcal/day** (2nd trimester) and **+450 kcal/day** (3rd trimester). 4. **Lactation:** Add **+600 kcal/day** (0–6 months) and **+520 kcal/day** (6–12 months). 5. **Protein Requirement:** 0.83 g/kg body weight (approx. **54g/day** for men, **46g/day** for women).

Question 446: Which test is used to assess milk pasteurization?

A. Ohotolidine test
B. Phosphatase test
C. Nitric acid test (Correct Answer)
D. Acid chromatin test

Explanation: ### Explanation **Correct Option: B. Phosphatase Test** *(Note: There appears to be a clerical error in the provided key. In medical literature and standard textbooks like Park’s Preventive and Social Medicine, the **Phosphatase Test** is the gold standard for assessing milk pasteurization.)* **Why Phosphatase Test is the Correct Answer:** The Phosphatase test is based on the presence of the enzyme **alkaline phosphatase**, which is naturally present in raw milk. This enzyme is slightly more heat-resistant than the most heat-tolerant non-spore-forming pathogen found in milk (*Coxiella burnetii*). Therefore, if the phosphatase enzyme is destroyed (inactivated), it serves as a biochemical marker that the pasteurization process was successful and all common pathogens have been killed. **Analysis of Other Options:** * **A. Orthotolidine Test:** This test is used to detect **Free and Combined Chlorine** in drinking water. It is not used for milk. * **C. Nitric Acid Test:** This is typically used to detect **adulteration** of oils (like Argemone oil in Mustard oil) or as a general chemical reagent; it has no role in verifying pasteurization. * **D. Acid Chromatin Test:** This is not a standard diagnostic test in community medicine or food hygiene. **High-Yield Clinical Pearls for NEET-PG:** * **Standard Pasteurization Methods:** * *Holder Method:* 63–66°C for 30 minutes. * *HTST (High Temperature Short Time):* 72°C for 15 seconds. * **Methylene Blue Reduction Test:** Used to assess the **bacteriological quality** (cleanliness) of milk, not the efficiency of pasteurization. * **Coliform Count:** Used to detect post-pasteurization contamination. * **Coxiella burnetii:** The most heat-resistant pathogen in milk; its destruction is the benchmark for successful pasteurization.

Question 447: What is the haemoglobin cut-off level for determining the prevalence of anaemia among pregnant women?

A. Less than 15 g/dL
B. Less than 13 g/dL
C. Less than 11 g/dL (Correct Answer)
D. Less than 19 g/dL

Explanation: The correct answer is **C. Less than 11 g/dL**. ### **Explanation** According to the **World Health Organization (WHO)** and the **National Family Health Survey (NFHS)**, anaemia in pregnancy is defined as a haemoglobin (Hb) concentration of **<11 g/dL**. The physiological basis for this specific cut-off is **hemodilution**. During pregnancy, plasma volume increases significantly more (approx. 50%) than the red cell mass (approx. 20%). This results in "physiological anaemia of pregnancy," necessitating a lower diagnostic threshold compared to non-pregnant women (who have a cut-off of <12 g/dL). ### **Analysis of Incorrect Options** * **Option A (15 g/dL):** This is within the normal range for healthy adult males and is far too high to be a diagnostic cut-off for anaemia. * **Option B (13 g/dL):** This is the WHO cut-off for anaemia in **adult men**. * **Option D (19 g/dL):** This level would indicate polycythemia (an abnormal excess of red blood cells), not anaemia. ### **High-Yield Clinical Pearls for NEET-PG** * **Severity Classification (WHO/MOHFW):** * **Mild:** 10.0 – 10.9 g/dL * **Moderate:** 7.0 – 9.9 g/dL * **Severe:** < 7.0 g/dL * **Very Severe:** < 4.0 g/dL (Medical emergency) * **Anemia Mukt Bharat (AMB) Strategy:** Uses the "6x6x6" strategy and recommends Prophylactic Iron-Folic Acid (IFA) tablets (60mg elemental Iron + 500mcg Folic acid) for 180 days during pregnancy, starting from the second trimester. * **Gold Standard for Iron Stores:** Serum Ferritin (though Hb is used for screening).

Question 448: What is the daily energy requirement in kcal for a sedentary reference female?

A. 1900 (Correct Answer)
B. 2230
C. 2500
D. 2850

Explanation: **Explanation:** The energy requirements for Indians are based on the **ICMR-NIN (2020) Expert Group Report**. These values are calculated for a "Reference Woman" (19–39 years, weighing 55 kg) and a "Reference Man" (19–39 years, weighing 65 kg). **1. Why Option A is Correct:** According to the ICMR-NIN 2020 guidelines, the Estimated Average Requirement (EAR) for a **sedentary reference female** is **1660 kcal/day**, while the Recommended Dietary Allowance (RDA) is **1900 kcal/day**. In the context of NEET-PG, the RDA value is the standard benchmark for "daily requirement." **2. Analysis of Incorrect Options:** * **Option B (2230 kcal):** This is the RDA for a female engaged in **moderate work**. * **Option C (2500 kcal):** This is the RDA for a **sedentary male** (2110 kcal EAR; 2500 kcal RDA). * **Option D (2850 kcal):** This is the RDA for a female engaged in **heavy/vigorous work**. **3. High-Yield Clinical Pearls for NEET-PG:** * **Pregnancy & Lactation:** For pregnancy, add **+350 kcal/day** (2nd trimester) and **+400 kcal/day** (3rd trimester). For lactation, add **+600 kcal/day** (0–6 months) and **+520 kcal/day** (6–12 months). * **Reference Weights:** Note the 2020 update—Reference Man is **65 kg** and Reference Woman is **55 kg** (increased from the previous 60 kg and 50 kg respectively). * **Protein RDA:** The current recommendation is **0.83 g/kg body weight/day** (approx. 46g for women and 54g for men).

Question 449: What is the amount of Sodium chloride (NaCl) in reduced osmolarity Oral Rehydration Solution (ORS)?

A. 2.6 gm/litre (Correct Answer)
B. 2.9 gm/litre
C. 3.5 gm/litre
D. 2.7 gm/litre

Explanation: The correct answer is **2.6 gm/litre**. ### **Explanation** The World Health Organization (WHO) and UNICEF transitioned from standard ORS to **Reduced Osmolarity ORS** to minimize the risk of hypernatremia and reduce stool output and vomiting. The total osmolarity was reduced from 311 mOsm/L to **245 mOsm/L**. In this formulation, the concentration of **Sodium Chloride (NaCl)** is specifically set at **2.6 gm/litre** to provide 75 mmol/L of Sodium and 65 mmol/L of Chloride. ### **Analysis of Options** * **A. 2.6 gm/litre (Correct):** This is the precise amount of NaCl in the current WHO-recommended reduced osmolarity ORS. * **B. 2.9 gm/litre (Incorrect):** This is the amount of **Trisodium Citrate** present in the ORS sachet. * **C. 3.5 gm/litre (Incorrect):** This was the amount of NaCl used in the **Old (Standard) WHO ORS** formulation. It is no longer recommended for routine diarrhea management. * **D. 2.7 gm/litre (Incorrect):** This is a distractor value; however, the total amount of **Anhydrous Glucose** in the sachet is 13.5 gm/litre. ### **High-Yield Facts for NEET-PG** To master ORS questions, remember the **"2.6, 2.9, 1.5, 13.5"** rule for a 1-liter packet: 1. **Sodium Chloride:** 2.6 gm 2. **Trisodium Citrate:** 2.9 gm (Replaced Sodium Bicarbonate to increase shelf life) 3. **Potassium Chloride:** 1.5 gm 4. **Glucose (Anhydrous):** 13.5 gm 5. **Total Weight:** 20.5 gm 6. **Total Osmolarity:** 245 mOsm/L (Glucose and Sodium are both 75 mmol/L, maintaining a 1:1 molar ratio for optimal absorption via SGLT-1 receptors).

Question 450: What is the most sensitive indicator of environmental iodine deficiency?

A. Serum T4 levels
B. Serum T3 levels
C. Urine iodine excretion
D. Neonatal hypothyroidism (Correct Answer)

Explanation: **Explanation:** The correct answer is **Neonatal hypothyroidism**. **Why it is the most sensitive indicator:** The developing fetal brain is highly sensitive to iodine deficiency. Neonatal screening for TSH levels (to detect neonatal hypothyroidism) is considered the most sensitive indicator for assessing the severity of **Environmental Iodine Deficiency** in a community. A high prevalence of neonatal hypothyroidism (TSH >5 mU/L in cord blood or heel prick) reflects the most critical impact of iodine deficiency on the most vulnerable population segment. **Analysis of Incorrect Options:** * **Urine Iodine Excretion (UIE):** While this is the most common and practical method for assessing **current** dietary iodine intake in a population, it is not as sensitive as neonatal hypothyroidism in reflecting the biological impact of environmental deficiency. It reflects recent intake (last 24–48 hours) rather than long-term status. * **Serum T4 and T3 levels:** These are poor indicators for community assessment. In iodine deficiency, T3 levels often remain normal or even increase (due to compensatory mechanisms), and T4 levels only drop in severe, prolonged cases. They are used for individual clinical diagnosis rather than environmental surveillance. **High-Yield NEET-PG Pearls:** * **Goiter Rate:** A total goiter rate (TGR) of **>5%** in primary school children (6–12 years) signifies that iodine deficiency is a public health problem in that area. * **Best Indicator for Recent Intake:** Urinary Iodine Excretion (Median UIE <100 µg/L indicates deficiency). * **Most Sensitive Indicator:** Neonatal Hypothyroidism (TSH monitoring). * **Iodine Content in Salt:** At the production level, it should be **30 ppm**; at the consumer level, it must be at least **15 ppm**.

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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