Nutrition and Health — MCQs

Nutrition and Health Indian Medical PG Practice Questions and MCQs

Question 391: Which of the following is NOT reported as a clinical manifestation of zinc deficiency in children?

A. Dwarfism and hypogonadism
B. Liver and spleen enlargement
C. Impaired cell-mediated immunity
D. Macrocytic anemia (Correct Answer)

Explanation: **Explanation:** Zinc is an essential trace element required for the function of over 300 enzymes, playing a critical role in growth, immune function, and protein synthesis. **Why Macrocytic Anemia is the Correct Answer:** Zinc deficiency is characteristically associated with **Microcytic Hypochromic Anemia**, not macrocytic anemia. Macrocytic anemia is typically caused by deficiencies in Vitamin B12 or Folic acid. In zinc deficiency, the anemia occurs due to impaired hemoglobin synthesis and altered iron metabolism. **Analysis of Incorrect Options:** * **A. Dwarfism and Hypogonadism:** These are classic hallmarks of chronic zinc deficiency. Zinc is vital for the action of growth hormone and the development of reproductive organs. The "Prasad’s Syndrome" (described in the 1960s) specifically links zinc deficiency to growth retardation and delayed sexual maturation. * **B. Liver and Spleen Enlargement:** Hepatosplenomegaly is a documented clinical finding in children with severe zinc deficiency, often seen alongside growth stunting and anemia. * **C. Impaired Cell-Mediated Immunity:** Zinc is crucial for T-lymphocyte function and thymic hormones. Deficiency leads to lymphoid atrophy and increased susceptibility to infections (especially diarrhea and pneumonia). **High-Yield Clinical Pearls for NEET-PG:** * **Acrodermatitis Enteropathica:** An autosomal recessive disorder of zinc absorption characterized by periorificial and acral dermatitis, alopecia, and diarrhea. * **Zinc & Diarrhea:** WHO/UNICEF recommend 20 mg of zinc daily for 10–14 days for children with acute diarrhea to reduce severity and recurrence. * **Hypogeusia:** Zinc deficiency leads to a decreased sense of taste. * **Wound Healing:** Zinc is essential for collagen synthesis; deficiency causes delayed wound healing.

Question 392: Niacin deficiency in a maize-eating population is due to which of the following factors?

A. High Tryptophan
B. High Isoleucine
C. High Leucine (Correct Answer)
D. High Phenylalanine

Explanation: ### Explanation **Correct Option: C (High Leucine)** The association between maize consumption and Pellagra (Niacin deficiency) is a classic high-yield concept in Community Medicine. While maize is inherently low in bioavailable Niacin and Tryptophan, the primary culprit in maize-eating populations is the **high concentration of the amino acid Leucine**. **Underlying Medical Concept:** Niacin (Vitamin B3) can be synthesized endogenously from the amino acid Tryptophan (60 mg Tryptophan = 1 mg Niacin). High levels of Leucine interfere with this metabolic pathway by inhibiting the enzyme **Quinolinate Phosphoribosyl Transferase (QPRT)**. This inhibition blocks the conversion of Tryptophan to Niacin, leading to a functional deficiency even if some Tryptophan is present in the diet. **Analysis of Incorrect Options:** * **A. High Tryptophan:** This is incorrect because Tryptophan is a precursor to Niacin. High levels would prevent deficiency, not cause it. Maize is actually deficient in Tryptophan. * **B. High Isoleucine:** While Isoleucine is a branched-chain amino acid like Leucine, it does not play a role in inhibiting Niacin synthesis. In fact, increasing Isoleucine intake can sometimes counteract the antagonistic effects of Leucine. * **D. High Phenylalanine:** Phenylalanine is an essential amino acid involved in tyrosine synthesis; it has no metabolic interference with the Niacin-Tryptophan pathway. **High-Yield Clinical Pearls for NEET-PG:** * **The 4 D’s of Pellagra:** Dermatitis (Casal’s necklace), Diarrhea, Dementia, and Death. * **Jowar Connection:** Pellagra is also seen in populations eating **Jowar (Sorghum)** due to high Leucine content, similar to maize. * **Nixtamalization:** Treating maize with alkali (lime) releases bound Niacin (Niacytin), explaining why traditional Mexican populations (who eat tortillas) rarely get Pellagra despite high maize intake. * **Amino Acid Antagonism:** This is a prime example of how an excess of one nutrient (Leucine) can precipitate the deficiency of another (Niacin).

Question 393: How does a Village Health Guide measure the state of malnutrition in an under-5 child?

A. Mid-arm circumference (Correct Answer)
B. Weight-for-age
C. Skin fold thickness
D. Height-for-age

Explanation: **Explanation:** The **Mid-Upper Arm Circumference (MUAC)** is the most appropriate tool for a Village Health Guide (VHG) because it is a **simple, quick, and field-friendly** screening method. It requires minimal training and no complex equipment, making it ideal for community-level health workers. Between the ages of 1 and 5 years, the MUAC remains relatively constant (around 15-16 cm) in healthy children. A measurement below **12.5 cm** indicates malnutrition, and below **11.5 cm** signifies Severe Acute Malnutrition (SAM). The VHG typically uses a "Shakir Tape" (color-coded) for easy interpretation: Green (Normal), Yellow (Borderline), and Red (Malnourished). **Analysis of Incorrect Options:** * **Weight-for-age (B):** This is the standard for growth monitoring in Anganwadi centers (using WHO Growth Charts). However, it requires a calibrated weighing scale and accurate plotting, which is more complex than a MUAC measurement for a VHG. * **Skin fold thickness (C):** This measures subcutaneous fat using Harpenden calipers. It is a research-grade tool and is too technical for routine use by community volunteers. * **Height-for-age (D):** This is used to measure **Stunting** (chronic malnutrition). It requires a stadiometer/infantometer and precise age documentation, which is often difficult to obtain in rural field settings. **High-Yield Clinical Pearls for NEET-PG:** * **MUAC** is the best predictor of **mortality risk** in children with PEM. * **Quac Stick:** A field method that relates MUAC to height (used when age is unknown). * **Weight-for-Height:** The best indicator for **Wasting** (acute malnutrition). * **Height-for-Age:** The best indicator for **Stunting** (chronic malnutrition). * **Weight-for-Age:** Used for **Underweight** (composite indicator of both acute and chronic malnutrition).

Question 394: Obesity is defined as a Body Mass Index (BMI) greater than which value?

A. 25
B. 30 (Correct Answer)
C. 35
D. 40

Explanation: **Explanation:** The Body Mass Index (BMI), or Quetelet Index, is the most widely used objective marker to classify nutritional status in adults. It is calculated as weight in kilograms divided by the square of height in meters ($kg/m^2$). **1. Why Option B is Correct:** According to the **WHO Classification**, a BMI of **$\geq$ 30 $kg/m^2$** is the definitive threshold for **Obesity**. This value is used globally to identify individuals at significantly increased risk for metabolic syndrome, cardiovascular diseases, and Type 2 Diabetes. **2. Analysis of Incorrect Options:** * **Option A (25):** This is the cutoff for **Overweight** (Pre-obese). A BMI between 25.0 and 29.9 indicates an individual is overweight but not yet clinically obese. * **Option C (35):** This represents the threshold for **Class II Obesity** (35.0–39.9). It is a sub-classification indicating higher clinical risk. * **Option D (40):** This is the cutoff for **Class III Obesity** (Morbid Obesity), representing the most severe category. **3. High-Yield Clinical Pearls for NEET-PG:** * **Asian-Indian Cutoffs:** Due to higher body fat percentages at lower BMIs, the criteria for Indians are lower: * Overweight: 23.0 – 24.9 $kg/m^2$ * **Obesity: $\geq$ 25 $kg/m^2$** * **Ponderal Index:** Calculated as $Weight/Height^3$. It is considered more sensitive than BMI for certain body types. * **Waist-Hip Ratio (WHR):** A better indicator of upper body (android) obesity. Risk increases if WHR > 0.9 in men or > 0.85 in women. * **Gold Standard:** While BMI is practical, **Hydrostatic weighing** remains the gold standard for measuring body fat percentage.

Question 395: How many calories does human milk contain?

A. 45
B. 72 (Correct Answer)
C. 117
D. 146

Explanation: **Explanation:** The energy content of human milk is a high-yield fact in Community Medicine and Pediatrics. On average, human milk provides approximately **65–70 kcal per 100 ml**. In the context of standard medical examinations like NEET-PG, **72 kcal/100 ml** is the most frequently cited and accepted value based on standard textbooks (like Park’s Preventive and Social Medicine). **Analysis of Options:** * **Option B (72 kcal):** This is the correct value. The energy in breast milk is primarily derived from fats (about 50%) and carbohydrates (lactose), providing the necessary fuel for the rapid growth and brain development of an infant. * **Option A (45 kcal):** This value is too low. While the caloric density can vary slightly based on maternal nutrition and the stage of lactation (e.g., colostrum vs. mature milk), it never drops this low in healthy individuals. * **Option C (117 kcal) & D (146 kcal):** These values are significantly higher than human milk. Such high caloric densities are usually only seen in specialized "high-calorie" infant formulas designed for preterm babies or infants with severe growth failure. **High-Yield Clinical Pearls for NEET-PG:** * **Composition per 100 ml:** Human milk contains approximately **1.1–1.2g of Protein**, **3.4–4.5g of Fat**, and **7g of Lactose**. * **Comparison with Cow’s Milk:** Cow’s milk has more protein (3.2g) but less lactose (4.4g) compared to human milk. The energy content of cow’s milk is slightly lower, at approximately **65–67 kcal/100 ml**. * **Colostrum:** The first milk produced (days 1–5) is rich in antibodies (IgA) and minerals but has a slightly lower caloric value (approx. 58 kcal/100 ml) than mature milk.

Question 396: What is the best method to compare protein quality?

A. Net protein utilization (Correct Answer)
B. Biological value
C. Specific dynamic action of protein
D. Presence or absence of essential amino acids

Explanation: **Explanation:** The quality of a protein is determined by its ability to be digested, absorbed, and utilized by the body for growth and maintenance. **1. Why Net Protein Utilization (NPU) is the best method:** NPU is considered the superior indicator of protein quality because it accounts for both **digestibility** and the **utilization** of absorbed amino acids. It is calculated as: *NPU = [Nitrogen Retained / Nitrogen Intake] × 100*. Unlike other measures, NPU provides a direct estimate of the actual amount of protein the body can use from a specific food source. For example, Egg protein has an NPU of 100, serving as the reference standard. **2. Analysis of Incorrect Options:** * **Biological Value (BV):** This measures the percentage of *absorbed* nitrogen that is retained. It ignores the nitrogen lost during digestion (fecal loss). Therefore, if a protein is poorly digested but well-utilized once absorbed, BV will be falsely high. * **Specific Dynamic Action (SDA):** This refers to the energy expenditure (thermogenesis) required to process food. Protein has the highest SDA (~30%), but this relates to metabolism and weight management, not protein quality. * **Presence/Absence of Essential Amino Acids:** While this determines if a protein is "complete" or "incomplete," it is a qualitative assessment, not a quantitative method to compare efficiency or utilization. **High-Yield NEET-PG Pearls:** * **Reference Protein:** Egg (BV = 100, NPU = 100). * **Limiting Amino Acids:** Pulses are deficient in **Methionine**; Cereals are deficient in **Lysine**. * **PPU (Protein Utilization):** In the Indian context, the NPU of a mixed Indian diet is approximately **65**. * **Digestibility Coefficient:** Nitrogen absorbed / Nitrogen ingested. If this is low, NPU will be significantly lower than BV.

Question 397: Peripheral neuritis is a deficiency sign of which vitamin?

A. Folic acid
B. Niacin
C. Thiamine (Correct Answer)
D. Tocopherol

Explanation: **Explanation:** **Thiamine (Vitamin B1)** is the correct answer because it plays a critical role in carbohydrate metabolism and the maintenance of the myelin sheath. A deficiency leads to **Beriberi**, which is clinically categorized into two main types: * **Dry Beriberi:** Characterized by **peripheral neuritis**, muscle wasting, and loss of sensation. The neuritis typically presents as symmetrical paresthesia and weakness in the lower extremities. * **Wet Beriberi:** Involves high-output cardiac failure and edema. * **Wernicke-Korsakoff Syndrome:** A neurological emergency often seen in alcoholics. **Analysis of Incorrect Options:** * **Folic Acid (B9):** Deficiency primarily causes **Megaloblastic anemia** and neural tube defects (NTDs) in fetuses. It does not typically cause peripheral neuritis. * **Niacin (B3):** Deficiency leads to **Pellagra**, characterized by the "4 Ds": Dermatitis (Casal’s necklace), Diarrhea, Dementia, and Death. * **Tocopherol (Vitamin E):** Acts as an antioxidant. Deficiency is rare but can lead to hemolytic anemia in newborns and posterior column signs (ataxia), but it is not the classic cause of peripheral neuritis. **High-Yield Clinical Pearls for NEET-PG:** * **Infantile Beriberi:** Occurs in infants (2–4 months) breastfed by thiamine-deficient mothers; presents with aphonia (silent cry) and cardiac failure. * **Thiamine Antagonists:** Pyrithiamine and oxythiamine. * **Enzyme Marker:** Erythrocyte transketolase activity is used to assess thiamine status. * **Refeeding Syndrome:** Thiamine deficiency can be precipitated by rapid glucose administration in malnourished patients. Always "thiamine before glucose."

Question 398: What is the level of iodization in salt at the consumer level according to the Prevention of Food Adulteration Act (PFA)?

A. 10 ppm
B. 15 ppm (Correct Answer)
C. 30 ppm
D. 45 ppm

Explanation: ### Explanation The correct answer is **15 ppm**. Under the **National Iodine Deficiency Disorders Control Programme (NIDDCP)** and the **Prevention of Food Adulteration (PFA) Act** (now under FSSAI regulations), the mandatory levels of iodization for salt are strategically set to account for iodine loss during distribution and storage. 1. **Why 15 ppm is correct:** The PFA Act mandates that iodized salt must contain **no less than 15 ppm of iodine at the consumer level**. This ensures that even after losses during cooking and storage, an individual receives the daily requirement of iodine (approx. 150 µg/day for adults) to prevent disorders like goiter and cretinism. 2. **Why 30 ppm is incorrect:** This is the mandated level at the **production (manufacturer) level**. It is set higher to compensate for the estimated 50% loss of iodine that occurs during transit, storage, and exposure to moisture/heat before reaching the consumer. 3. **Why 10 ppm and 45 ppm are incorrect:** These values do not correspond to the statutory requirements under the PFA Act for common iodized salt. 10 ppm is insufficient to meet public health goals, and 45 ppm is not a standard regulatory benchmark for salt iodization in India. --- ### High-Yield Clinical Pearls for NEET-PG: * **Iodine Content:** 1 part of Potassium Iodate contains roughly 0.6 parts of Iodine. * **Daily Requirement:** 150 µg for adults; 250 µg for pregnant and lactating women. * **Indicator of Choice:** **Urinary Iodine Excretion** is the best epidemiological indicator for monitoring iodine status in a community (Median value $\ge$ 100 µg/L is considered adequate). * **Neonatal Hypothyroidism:** The most sensitive indicator for environmental iodine deficiency. * **Salt Testing:** The **MBI (Modified Benzidine Index) kit** is used for spot-testing iodine levels in salt at the field level.

Question 399: Which of the following grains contains the maximum amount of fiber?

A. Wheat
B. Oat
C. Rice
D. Corn (Correct Answer)

Explanation: **Explanation:** The dietary fiber content of cereals and grains varies significantly based on the structure of the kernel and the degree of processing. Among the common grains listed, **Corn (Maize)** contains the highest amount of total dietary fiber. **1. Why Corn is Correct:** Whole-grain corn contains approximately **7.3 grams of fiber per 100g**. The majority of this fiber is insoluble (cellulose, hemicellulose, and lignin), concentrated in the thick outer hull (pericarp). In the context of NEET-PG, corn is recognized for its high roughage content compared to other staple cereals. **2. Analysis of Incorrect Options:** * **Wheat:** Whole wheat is a good source of fiber (approx. **10-12g** in raw form), but in most comparative nutritional tables used in community medicine (like ICMR guidelines), the fiber yield from standard corn preparations often exceeds that of processed wheat. However, refined wheat (Maida) loses almost all its fiber. * **Oat:** While oats are famous for **Beta-glucan** (a soluble fiber), their total dietary fiber is generally around **10g**. In many standardized exams, corn is prioritized due to its higher proportion of crude/insoluble fiber. * **Rice:** Rice has the lowest fiber content among these options. Polished white rice contains only about **0.2–0.5g** of fiber, as the bran layer is removed during milling. Even brown rice (approx. **3.5g**) contains significantly less fiber than corn. **High-Yield Clinical Pearls for NEET-PG:** * **Fiber and Disease:** High fiber intake is protective against Colon Cancer, Type 2 Diabetes, and Diverticulosis. * **The "Pellagragenic" Grain:** While high in fiber, corn is deficient in **Tryptophan** and contains bound **Niacin** (Niacytin), leading to Pellagra in populations where it is a staple. * **Rice Fact:** Parboiled (converted) rice retains more Vitamin B1 (Thiamine) than polished rice, preventing Beriberi.

Question 400: The Kanawati index is used for assessing which of the following?

A. Socioeconomic status
B. Protein energy malnutrition (Correct Answer)
C. Food fortification
D. Non-communicable disease

Explanation: **Explanation:** The **Kanawati Index** (also known as the Kanawati and McLaren Index) is a simple anthropometric tool used for the rapid assessment of **Protein-Energy Malnutrition (PEM)** in children, particularly in the age group of 1 to 5 years. It is calculated using the formula: **Kanawati Index = Mid-Arm Circumference (cm) / Occipito-frontal (Head) Circumference (cm)** * **Why it is correct:** In a healthy child, the head circumference grows rapidly in the first year but slows down thereafter, while muscle mass (reflected in mid-arm circumference) increases. In PEM, muscle wasting occurs, leading to a lower ratio. A value **>0.31** is considered normal, while values **<0.25** indicate severe malnutrition. **Analysis of Incorrect Options:** * **A. Socioeconomic status:** Assessed using scales like the Modified Kuppuswamy (urban), Udai Pareek (rural), or BG Prasad (income-based) scales. * **C. Food fortification:** Refers to the addition of micronutrients to food (e.g., Iodized salt, Vitamin A in oil). It is a public health strategy, not measured by an anthropometric index. * **D. Non-communicable disease:** Assessed via risk scores (e.g., WHO/ISH charts for CVD) or biochemical markers, not by mid-arm/head circumference ratios. **High-Yield Clinical Pearls for NEET-PG:** * **Quac Stick (Quaker Arm Circumference):** Uses a stick to measure Mid-Upper Arm Circumference (MUAC) against height to screen for PEM. * **Shakir’s Tape:** A tri-colored tape used for MUAC; Green (>13.5 cm) is normal, Yellow (12.5–13.5 cm) is borderline, and Red (<12.5 cm) indicates PEM. * **Rao’s Index:** Another PEM index calculated as $Weight / Height^2$. * **Bangalore Method:** A clinical grading system for PEM based on physical signs.

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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