Nutrition and Health — MCQs

Nutrition and Health Indian Medical PG Practice Questions and MCQs

Question 521: Which of the following is NOT a method for assessing obesity?

A. Quetelet's index
B. Broca index
C. Sullivan's index (Correct Answer)
D. Corpulence index

Explanation: **Explanation:** The correct answer is **C. Sullivan’s Index**, as it is a measure of morbidity/disability rather than obesity. **1. Why Sullivan’s Index is the Correct Answer:** Sullivan’s Index (also known as **Disability-Free Life Expectancy**) is a vital health indicator used in epidemiology. It is calculated by subtracting the duration of bed disability and inability to perform major activities from the life expectancy. It represents the number of years a person can expect to live without disability. It has no clinical application in measuring body fat or obesity. **2. Analysis of Other Options (Methods to Assess Obesity):** * **A. Quetelet’s Index:** This is the most common name for **Body Mass Index (BMI)**, calculated as $Weight (kg) / Height (m^2)$. It is the international standard for classifying overweight and obesity. * **B. Broca Index:** A simple formula used to estimate ideal body weight. $Ideal Weight (kg) = Height (cm) - 100$. Deviations above this ideal weight are used to assess obesity. * **D. Corpulence Index:** Also known as the **Ponderal Index** or Rohrer's Index, it is calculated as $Weight (kg) / Height (m^3)$. It is often used in pediatrics to assess if a newborn is "wasted" or "stunted." **Clinical Pearls for NEET-PG:** * **Best measure of abdominal obesity:** Waist-to-Hip Ratio (WHR). A ratio $>0.9$ in men and $>0.85$ in women indicates central obesity. * **Skinfold thickness:** Measured using **Harpenden Calipers** (usually at the triceps) to estimate subcutaneous fat. * **Lorentz’s Formula:** A modification of the Broca index that accounts for gender. * **BMI Cut-offs (WHO):** Overweight: $\geq 25$; Obese: $\geq 30$. (Note: Indian/Asian cut-offs are lower: Overweight $\geq 23$; Obese $\geq 25$).

Question 522: What is the prophylactic dose of vitamin A for individuals aged 16 years?

A. 2000 IU
B. 20000 IU
C. 200000 IU (Correct Answer)
D. 100000 IU

Explanation: ### Explanation The correct answer is **200000 IU**. **Underlying Medical Concept:** The National Prophylaxis Programme against Nutritional Blindness in India (now part of the Reproductive and Child Health program) mandates periodic high-dose Vitamin A supplementation to prevent Vitamin A Deficiency (VAD) and Xerophthalmia. According to the current guidelines: * **Infants (6–11 months):** A single dose of **100,000 IU**. * **Children (1–5 years):** A dose of **200,000 IU** every 6 months. * **Adolescents and Adults:** While the primary focus of the national program is children under 5, the standard therapeutic and prophylactic high-dose for anyone **above the age of 1 year** (including a 16-year-old) is **200,000 IU**. This dose is sufficient to maintain hepatic stores for approximately six months. **Analysis of Incorrect Options:** * **A (2000 IU):** This is closer to the Recommended Dietary Allowance (RDA) for daily intake, not a periodic prophylactic "mega-dose." * **B (20000 IU):** This dose is insufficient for long-term prophylaxis and does not align with any standard WHO or National Indian guidelines for periodic supplementation. * **D (100000 IU):** This is the specific dose reserved for infants aged **6 to 11 months**. Administering this to a 16-year-old would be a sub-therapeutic prophylactic dose. **High-Yield NEET-PG Pearls:** 1. **Total Doses:** A child should receive a total of **9 doses** by the age of 5 years (1st dose at 9 months with Measles/MR vaccine). 2. **Maximum Cumulative Dose:** The total amount administered by age 5 is **17,00,000 IU** (1 lakh + 8 times 2 lakhs). 3. **Treatment of Xerophthalmia:** The schedule is Day 0, Day 1, and Day 14 (200,000 IU per dose for those >1 year). 4. **Post-partum:** A single dose of 200,000 IU can be given to the mother within 8 weeks of delivery to increase Vitamin A content in breast milk.

Question 523: All of the following are seen in vitamin C deficiency except?

A. Swollen, bleeding gums
B. Delayed wound healing
C. Anemia
D. Infertility (Correct Answer)

Explanation: **Explanation:** Vitamin C (Ascorbic acid) is a water-soluble vitamin essential for the hydroxylation of proline and lysine residues during **collagen synthesis**. Deficiency leads to **Scurvy**, a condition characterized by weakened connective tissues and capillary fragility. * **Why Infertility is the correct answer:** Infertility is not a classic clinical feature of Vitamin C deficiency. While antioxidants play a role in reproductive health, infertility is primarily associated with deficiencies in **Vitamin E** (often called the "anti-sterility vitamin") or hormonal imbalances, rather than Vitamin C. * **Why other options are incorrect:** * **Swollen, bleeding gums:** Collagen is vital for the integrity of the periodontal ligament and capillary walls. Deficiency leads to "spongy" gums that bleed easily upon touch. * **Delayed wound healing:** Collagen is the primary structural protein required for tissue repair. Without adequate Vitamin C, the formation of new connective tissue is impaired, leading to poor wound healing or dehiscence of old scars. * **Anemia:** Vitamin C deficiency causes anemia through two mechanisms: (1) Chronic blood loss from mucosal surfaces, and (2) Vitamin C is essential for the **absorption of non-heme iron** by reducing it from the ferric ($Fe^{3+}$) to the ferrous ($Fe^{2+}$) state. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest sign of Scurvy:** Follicular hyperkeratosis. * **Characteristic Hemorrhages:** Perifollicular hemorrhages and "Corkscrew hairs." * **Infantile Scurvy (Barlow’s Disease):** Presents with subperiosteal hemorrhage causing "pseudoparalysis" and a "Frog-like position" of legs. * **Radiological signs:** White line of Fraenkel, Wimberger’s ring sign, and Pelkan spur.

Question 524: What is the recommended daily intake of Vitamin A for an infant?

A. 350 mcg (Correct Answer)
B. 600 mcg
C. 800 mcg
D. 1000 mcg

Explanation: **Explanation:** The recommended dietary allowance (RDA) for Vitamin A is based on the **ICMR-NIN (2020) guidelines**, which are the current gold standard for NEET-PG. Vitamin A is essential for infants to support rapid growth, immune function, and the integrity of epithelial tissues. **1. Why 350 mcg is correct:** According to the ICMR-NIN 2020 Expert Group, the RDA for Vitamin A (as Retinol) for infants aged **0–12 months is 350 mcg/day**. This value is calculated to maintain adequate serum retinol levels and liver stores during the first year of life. **2. Analysis of Incorrect Options:** * **600 mcg:** This is the RDA for **adult men and women** (sedentary/moderate/heavy work). It is too high for an infant and could lead to hypervitaminosis if maintained chronically. * **800 mcg:** This value is associated with the RDA for **pregnant women** (specifically 900 mcg in 2020 guidelines) or older children/adolescents in previous iterations. * **1000 mcg:** This exceeds the daily requirement for all standard age groups and approaches the Tolerable Upper Intake Level (UL) for younger children. **3. High-Yield Clinical Pearls for NEET-PG:** * **Vitamin A Prophylaxis Program (India):** * **1st dose:** 1 lakh IU at 9 months (with Measles/MR vaccine). * **2nd to 9th dose:** 2 lakh IU every 6 months up to 5 years of age. * **Total doses:** 9; **Total amount:** 17 lakh IU. * **Earliest Sign:** Conjunctival xerosis (though Night Blindness is the earliest *symptom*). * **Bitot’s Spots:** Triangular, pearly white foamy spots on the bulbar conjunctiva (WHO Stage X1B). * **Conversion:** 1 mcg of Retinol = 3.33 IU of Vitamin A.

Question 525: Which one of the following describes the flavouring substance asafoetida?

A. Dried leaf extract
B. Exudate from chopped roots (Correct Answer)
C. Pith of stem boiled and dried
D. Dried and hardened paste of fruit

Explanation: **Explanation:** **Asafoetida** (commonly known as *Hing*) is a potent flavoring agent and medicinal spice derived from the perennial herb *Ferula asafoetida*. **1. Why the correct answer is right:** Asafoetida is an **oleo-gum-resin**. It is obtained by making incisions (chopping) into the living **rhizomes or taproots** of the plant. A milky liquid exudes from these cuts, which then coagulates and hardens upon exposure to air into a resinous mass. This process makes **Option B** the correct botanical description. **2. Why the incorrect options are wrong:** * **Option A (Dried leaf extract):** While many herbs like bay leaves or mint are used as leaf extracts, asafoetida is strictly a root exudate. * **Option C (Pith of stem):** This describes substances like Sago (Sabudana). While some *Ferula* species have edible stems, the flavoring resin is not derived from the pith. * **Option D (Paste of fruit):** Spices like black pepper or cardamom come from fruits/seeds, but asafoetida does not. **3. High-Yield Clinical Pearls for NEET-PG:** * **Therapeutic Properties:** In traditional medicine and community health, it is used as a **carminative** (relieves flatulence), antispasmodic, and expectorant. * **Active Principle:** It contains sulfur compounds (mainly coumarins and volatile oils), which give it its characteristic pungent odor. * **Adulteration:** In the context of Food Adulteration (a frequent NEET-PG topic), asafoetida is commonly adulterated with **chalk, grit, or cheap resins/gums**. * **Public Health Significance:** It is often used in "Hing-water" as a home remedy for infantile colic and abdominal distension in rural communities.

Question 526: Which one of the following describes the flavouring substance asafoetida?

A. Dried leaf extract
B. Exudate from chopped roots (Correct Answer)
C. Pith of stem boiled and dried
D. Dried and hardened paste of fruit

Explanation: **Explanation:** **Asafoetida** (commonly known as *Hing*) is a potent flavoring agent and medicinal spice derived from the perennial herb *Ferula assa-foetida*. **Why Option B is Correct:** Asafoetida is an **oleo-gum-resin**. It is obtained by making incisions (chopping) into the living **rhizomes and taproots** of the plant. When the root is cut, a milky juice (exudate) flows out, which hardens upon exposure to air into a dark brown, resinous mass. This raw resin is then processed (often mixed with starch or gum arabic) to be sold as the culinary spice. **Analysis of Incorrect Options:** * **Option A (Dried leaf extract):** While many herbs like bay leaves or coriander are used as dried leaves, asafoetida is strictly a root exudate. * **Option C (Pith of stem):** This describes substances like Sago (from palm stems). While the stem of the *Ferula* plant can produce some resin, the primary commercial source is the root. * **Option D (Paste of fruit):** Spices like black pepper or tamarind come from fruits, but asafoetida does not. **NEET-PG High-Yield Pearls:** * **Therapeutic Properties:** In Community Medicine and Pharmacology, it is recognized for its **carminative** (relieves flatulence), antispasmodic, and expectorant properties. * **Adulteration:** Asafoetida is a common subject in "Food Adulteration" topics. It is frequently adulterated with foreign resins, gums, or even chalk powder. * **Active Ingredient:** The characteristic pungent odor is due to **organic sulfur compounds**. * **Public Health Context:** It is often used in traditional medicine for intestinal parasites and digestive disorders, making it relevant to nutritional hygiene and indigenous medicine sections of the PSM syllabus.

Question 527: What is the dosage of retinol palmitate for early stages of xerophthalmia?

A. 90 mg orally on two successive days
B. 100 mg orally on two successive days
C. 110 mg orally on two successive days (Correct Answer)
D. 120 mg orally on two successive days

Explanation: ### Explanation **1. Understanding the Correct Answer (Option C)** The treatment protocol for clinical xerophthalmia (Bitot’s spots, corneal xerosis, keratomalacia) involves the immediate administration of high-dose Vitamin A. The standard therapeutic dose for adults and children over one year of age is **200,000 International Units (IU)**. In pharmacological terms, **1 IU of Vitamin A is equivalent to 0.55 mcg of Retinol Palmitate**. Therefore: * 200,000 IU × 0.55 mcg = 110,000 mcg * 110,000 mcg = **110 mg** The WHO treatment schedule requires this dose to be given on **Day 1, Day 2, and Day 14** (or at follow-up 2–4 weeks later). The question specifically highlights the initial intensive phase (two successive days). **2. Why Other Options are Incorrect** * **Options A, B, and D:** These values (90 mg, 100 mg, 120 mg) do not mathematically correspond to the standardized 200,000 IU dose of retinol palmitate. 100 mg is a common distractor because it is a "round number," but it falls short of the required 200,000 IU potency. **3. High-Yield Clinical Pearls for NEET-PG** * **Prophylaxis vs. Treatment:** Do not confuse treatment doses (200,000 IU) with the Vitamin A Prophylaxis Program doses (100,000 IU for 6–11 months; 200,000 IU for 1–5 years every 6 months). * **Age-Specific Dosing (Treatment):** * **<6 months:** 50,000 IU (27.5 mg) * **6–12 months:** 100,000 IU (55 mg) * **>1 year:** 200,000 IU (110 mg) * **Xerophthalmia Classification:** Remember the WHO "X" classification (X1A: Conjunctival xerosis; X1B: Bitot’s spots; X3A/B: Corneal ulceration/Keratomalacia). * **Night Blindness (XN):** The earliest clinical sign; Bitot’s spots are the most common objective sign.

Question 528: Biological value of a protein is related to which of the following?

A. Nitrogen content (Correct Answer)
B. Amino acid content
C. Sulphur content
D. Energy content

Explanation: **Explanation:** The **Biological Value (BV)** of a protein is a measure of the proportion of absorbed protein from a food which becomes incorporated into the proteins of the organism's body. It specifically measures how efficiently the body utilizes dietary protein. **Why Nitrogen content is correct:** The fundamental principle of BV is based on **Nitrogen balance**. Proteins are the primary source of nitrogen in the diet. BV is calculated using the formula: $$BV = \frac{\text{Nitrogen Retained}}{\text{Nitrogen Absorbed}} \times 100$$ Since the body does not store excess amino acids, any nitrogen not used for tissue synthesis is excreted. Therefore, the amount of nitrogen retained in the body is the most direct indicator of a protein’s quality and its ability to support growth and maintenance. **Why other options are incorrect:** * **Amino acid content:** While the amino acid profile determines the quality of a protein (e.g., Net Protein Utilization), BV specifically refers to the *retention* of nitrogen after absorption. * **Sulphur content:** Though some amino acids (Methionine, Cysteine) contain sulphur, it is not the standard metric for measuring protein utilization efficiency. * **Energy content:** This refers to the caloric value (4 kcal/g for proteins), which is unrelated to the biological quality or tissue-building capacity of the protein. **High-Yield Clinical Pearls for NEET-PG:** * **Egg Protein:** Has a BV of **100**, making it the "Reference Protein" against which others are compared. * **Net Protein Utilization (NPU):** Unlike BV, NPU accounts for **digestibility**. ($NPU = BV \times \text{Digestibility coefficient} / 100$). * **Limiting Amino Acids:** Pulses are deficient in Methionine; Cereals are deficient in Lysine. * **Most sensitive indicator** of protein quality is the **Protein Efficiency Ratio (PER)**, which measures weight gain per gram of protein intake.

Question 529: What is the best indicator for nutritional status in a child?

A. Mid-arm circumference
B. Head circumference
C. Rate of increase of height and weight (Correct Answer)
D. Chest circumference

Explanation: **Explanation:** The **rate of increase of height and weight** (growth velocity) is considered the most sensitive and best indicator of a child's nutritional status. Nutrition is a dynamic process; while a single measurement provides a "snapshot" of the current state, serial measurements plotted over time on a growth chart reveal the **trend of growth**. A flattening or decline in the growth curve is often the earliest sign of protein-energy malnutrition (PEM), appearing even before clinical signs manifest. **Analysis of Incorrect Options:** * **Mid-arm circumference (MUAC):** This is a useful screening tool for quick assessment of wasting (acute malnutrition) in children aged 6–59 months, especially in field settings. However, it is not as comprehensive as longitudinal height and weight monitoring. * **Head circumference:** This primarily reflects brain development rather than general nutritional status. It is useful for monitoring neurodevelopmental issues (e.g., microcephaly or hydrocephalus) up to age 2–3. * **Chest circumference:** This is used mainly in relation to head circumference (the ratio crosses 1:1 at age 1). It is a poor independent indicator of nutrition. **High-Yield Clinical Pearls for NEET-PG:** * **Weight for Age:** Reflects "Underweight" (combined indicator of acute and chronic malnutrition). * **Height for Age:** Reflects "Stunting" (indicator of **chronic** malnutrition). * **Weight for Height:** Reflects "Wasting" (indicator of **acute** malnutrition). * **Road to Health Chart:** The primary tool for "Growth Monitoring" in the ICDS program, where the direction of the curve is more important than the actual weight.

Question 530: What is the Recommended Dietary Allowance (RDA) for Iodine?

A. 300 micrograms
B. 500 micrograms
C. 150 micrograms (Correct Answer)
D. 50 micrograms

Explanation: **Explanation:** The correct answer is **150 micrograms (Option C)**. Iodine is an essential trace element required for the synthesis of thyroid hormones (T3 and T4), which regulate metabolic rate, growth, and brain development. According to the WHO and ICMR guidelines, the daily requirement for a healthy adult is 150 µg to maintain normal thyroid function and prevent Iodine Deficiency Disorders (IDD). **Analysis of Options:** * **Option A (300 µg):** This exceeds the standard adult RDA. However, it is closer to the upper limits or specific therapeutic doses sometimes discussed in high-risk scenarios, but not the baseline requirement. * **Option B (500 µg):** This is significantly higher than the RDA. The WHO defines the "Tolerable Upper Intake Level" for iodine as 1100 µg/day; 500 µg is safe but not the recommended daily standard. * **Option D (50 µg):** This is the minimum amount required to prevent goiter, but it is insufficient to maintain optimal health and physiological reserves. **High-Yield Clinical Pearls for NEET-PG:** * **Pregnancy/Lactation:** The RDA increases to **250 µg/day** to support fetal brain development. * **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. * **Indicator of Status:** The best epidemiological indicator for monitoring iodine status in a community is **Median Urinary Iodine Excretion (MUIE)**. A value of 100–199 µg/L indicates adequate intake. * **Goiter Rate:** A community is considered to have endemic goiter if the Total Goiter Rate (TGR) is **>5%** among primary school children.

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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