Nutrition and Health — MCQs

Nutrition and Health Indian Medical PG Practice Questions and MCQs

Question 341: What is the minimal level of iodine at the consumer level in ppm?

A. 5
B. 10
C. 15 (Correct Answer)
D. 30

Explanation: **Explanation:** The correct answer is **15 ppm**. This value is determined by the **National Iodine Deficiency Disorders Control Programme (NIDDCP)** in India to ensure adequate iodine intake for the prevention of Goiter and other Iodine Deficiency Disorders (IDD). **1. Why 15 ppm is correct:** Under the NIDDCP, the legal requirement for iodine levels in salt is set at two different points in the supply chain to account for losses during transit and storage: * **At the Production level (Manufacturer):** Not less than **30 ppm**. * **At the Consumer level (Retailer/Household):** Not less than **15 ppm**. Since iodine is volatile and can be lost due to heat, moisture, and long-term storage, the initial concentration is kept higher so that at least 15 ppm reaches the consumer. **2. Why other options are incorrect:** * **Option A (5 ppm) & B (10 ppm):** These levels are insufficient to meet the daily physiological requirement of iodine (approx. 150 μg/day for adults) considering average salt consumption. * **Option D (30 ppm):** This is the mandatory level at the **production/manufacturing level**, not the consumer level. **High-Yield Clinical Pearls for NEET-PG:** * **Daily Requirement:** Adults: 150 μg; Pregnant women: 250 μg; Infants: 90 μg. * **Monitoring:** The most sensitive indicator for recent iodine intake is **Urinary Iodine Excretion (UIE)**. A UIE of <100 μg/L indicates iodine deficiency in a community. * **Goiter Rate:** A community is said to have endemic goiter if the Total Goiter Rate (TGR) is **>5%** among primary school-age children. * **Iodine Content:** 1 gram of salt with 15 ppm iodine provides 15 μg of iodine. Assuming a 10g daily salt intake, this ensures 150 μg/day.

Question 342: What is the recommended daily dose of vitamin A for a child aged 6-12 months?

A. 500 micrograms
B. 200 micrograms
C. 300 micrograms (Correct Answer)
D. 700 micrograms

Explanation: **Explanation:** The correct answer is **300 micrograms**. This recommendation is based on the **Recommended Dietary Allowance (RDA)** established by the ICMR-NIN (Indian Council of Medical Research - National Institute of Nutrition) for the Indian population. 1. **Why 300 µg is correct:** For infants aged 6–12 months, the RDA for Vitamin A (as Retinol) is specifically set at **300 µg/day**. This amount is calculated to maintain adequate serum retinol levels and support rapid growth, immune function, and ocular health during the transition from exclusive breastfeeding to complementary feeding. 2. **Analysis of Incorrect Options:** * **500 µg (Option A):** This is the RDA for children aged 1–6 years. * **200 µg (Option B):** This is below the recommended threshold for the 6–12 month age group and may lead to subclinical deficiency. * **700 µg (Option C):** This is closer to the RDA for adolescent boys and adult men (approx. 840–1000 µg). **High-Yield Clinical Pearls for NEET-PG:** * **Prophylaxis Schedule:** Do not confuse *daily RDA* with the *National Vitamin A Prophylaxis Programme* doses. Under the national program: * **9 months (with Measles/MR vaccine):** 1 lakh IU (30 mg) orally. * **1–5 years:** 2 lakh IU (60 mg) every 6 months (Total 9 doses). * **Conversion Factor:** 1 µg of Retinol = 3.33 IU of Vitamin A. * **Storage:** Vitamin A is stored in the **Ito cells** (Stellate cells) of the liver. * **Earliest Sign:** The earliest clinical sign of Vitamin A deficiency is **Conjunctival Xerosis**, while the earliest symptom is **Night Blindness (Nyctalopia)**.

Question 343: Virulence of a disease is indicated by which of the following?

A. Specific mortality rate
B. Proportional mortality rate
C. Amount of GDP spent on the disease
D. Case fatality ratio (Correct Answer)

Explanation: **Explanation:** The correct answer is **Case Fatality Ratio (CFR)**. **Why Case Fatality Ratio is Correct:** In epidemiology, **virulence** refers to the degree of pathogenicity of an infectious agent or its ability to cause severe disease and death. The Case Fatality Ratio measures the killing power of a disease by calculating the proportion of people diagnosed with a specific disease who die from it within a specified period. * **Formula:** (Total deaths from a disease / Total number of cases of that disease) × 100. Since it reflects the severity of the clinical outcome, it is the most direct indicator of a pathogen's virulence. **Why Other Options are Incorrect:** * **Specific Mortality Rate:** This measures the number of deaths from a specific cause in the *entire population* (e.g., deaths per 1,000 people). It reflects the risk of dying from the disease for the general public, not the inherent virulence of the organism once a person is infected. * **Proportional Mortality Rate:** This expresses the number of deaths due to a particular cause as a percentage of *total deaths* from all causes. it is used to identify the leading causes of death in a community, not the severity of the disease itself. * **Amount of GDP spent:** This is an economic indicator reflecting the "burden of disease" and healthcare infrastructure costs, rather than a biological measure of the pathogen. **High-Yield Clinical Pearls for NEET-PG:** * **CFR vs. Mortality Rate:** CFR is a ratio (numerator is part of the denominator), while Mortality Rate is a true rate (denominator is the population at risk). * **Complement of CFR:** (100 - CFR) represents the **Survival Rate**. * **Indicator of Communicability:** While CFR indicates virulence, the **Secondary Attack Rate (SAR)** is the best indicator of the communicability (infectivity) of an infectious disease. * **Disease with highest CFR:** Rabies (nearly 100%).

Question 344: Chronic malnutrition is measured by which of the following indices?

A. Weight-for-height ratio
B. Height-for-age ratio (Correct Answer)
C. Weight-for-age ratio
D. Mid-arm circumference

Explanation: **Explanation:** In nutritional epidemiology, anthropometric indices are used to differentiate between different types of malnutrition. **1. Why Height-for-age is the correct answer:** Height-for-age is the primary indicator of **chronic malnutrition (Stunting)**. Linear growth is a slow process; a deficit in height indicates a long-term, cumulative deficiency of nutrition or repeated infections. Stunting reflects a failure to reach genetic potential for growth due to chronic poor health or dietary conditions. **2. Analysis of Incorrect Options:** * **Weight-for-height (Wasting):** This measures **acute malnutrition**. It reflects a recent and severe process of weight loss, often associated with acute starvation or severe disease. It is the best indicator for "wasting." * **Weight-for-age (Underweight):** This is a composite indicator that reflects **both** acute and chronic malnutrition. While it is the most common parameter used in the ICDS (Anganwadi) growth charts, it cannot distinguish between a child who is short (stunted) and a child who is thin (wasted). * **Mid-arm circumference (MUAC):** This is a rapid screening tool used to identify **Severe Acute Malnutrition (SAM)** in children aged 6–59 months. It is not used to measure chronic nutritional status. **High-Yield Clinical Pearls for NEET-PG:** * **Stunting:** Height-for-age < -2 SD (Chronic). * **Wasting:** Weight-for-height < -2 SD (Acute). * **Underweight:** Weight-for-age < -2 SD (Composite). * **Waterlow’s Classification:** Uses Weight-for-height (Wasting) and Height-for-age (Stunting) to categorize malnutrition. * **Gomez Classification:** Uses only Weight-for-age. * **Quetelet Index:** Another name for Body Mass Index (BMI).

Question 345: What will be the Body Mass Index (BMI) of a male whose weight is 89 kg and height is 172 cm?

A. 27
B. 30 (Correct Answer)
C. 33
D. 36

Explanation: **Explanation:** **1. Calculation of the Correct Answer:** Body Mass Index (BMI), also known as Quetelet’s Index, is a key anthropometric measure used to assess nutritional status. The formula is: **BMI = Weight (kg) / [Height (m)]²** * **Step 1:** Convert height from cm to meters: $172\text{ cm} = 1.72\text{ m}$. * **Step 2:** Square the height: $1.72 \times 1.72 = 2.9584$. * **Step 3:** Divide weight by height squared: $89 / 2.9584 \approx 30.08$. Rounding to the nearest whole number gives **30**, which corresponds to Option B. **2. Analysis of Incorrect Options:** * **Option A (27):** This would be the result if the weight were approximately 80 kg. In the WHO classification, 27 falls under 'Overweight'. * **Option C (33) & Option D (36):** These values represent higher grades of obesity (Class I and Class II respectively). They are mathematically incorrect based on the provided weight of 89 kg. **3. NEET-PG High-Yield Clinical Pearls:** * **WHO Classification (Global):** * Underweight: <18.5 * Normal: 18.5–24.9 * Overweight: 25–29.9 * **Obese: ≥30** (Class I: 30–34.9; Class II: 35–39.9; Class III: ≥40) * **Revised Criteria for Asian Indians:** Due to higher risk of abdominal obesity and metabolic syndrome at lower BMIs, the cut-offs are lower: * Normal: 18.5–22.9 * Overweight: 23–24.9 * **Obesity: ≥25** * **Ponderal Index:** Another measure calculated as $\text{Weight (kg)} / \text{Height (m)}^3$. * **Corpulence Index:** $\text{Actual weight} / \text{Desired weight}$.

Question 346: The Rose-Bengal test is used to detect which of the following?

A. The presence of conjunctival xerosis (Correct Answer)
B. The safety of pasteurized milk
C. The presence of rabies antigen in corneal cells
D. The presence of antibodies in connective tissue disorders

Explanation: **Explanation:** The **Rose-Bengal test** is a diagnostic tool used to detect **conjunctival xerosis**, which is a clinical manifestation of Vitamin A deficiency (Xerophthalmia). Rose-Bengal is a vital dye that has a high affinity for dead or degenerating epithelial cells and areas where the protective mucin layer is absent. In Vitamin A deficiency, the conjunctiva undergoes squamous metaplasia and loses its goblet cells, leading to dryness (xerosis). When the dye is instilled into the eye, it stains these devitalized cells a distinct pink or red, making early xerotic changes visible even before the formation of Bitot’s spots. **Analysis of Incorrect Options:** * **Option B:** The safety of pasteurized milk is assessed using the **Phosphatase Test**, which checks if the enzyme alkaline phosphatase (naturally present in raw milk) has been inactivated by heat. * **Option C:** The presence of rabies antigen in corneal cells is detected via the **Corneal Impression Test** using Direct Fluorescent Antibody (DFA) staining. * **Option D:** Antibodies in connective tissue disorders (like SLE or Sjogren’s) are typically detected via **ANA (Antinuclear Antibody) testing** or ELISA. While Rose-Bengal is used to diagnose dry eye in Sjogren’s Syndrome, in the context of Community Medicine and Public Health, it is primarily associated with Vitamin A deficiency screening. **High-Yield Clinical Pearls for NEET-PG:** * **WHO Classification of Xerophthalmia:** X1A (Conjunctival xerosis), X1B (Bitot’s spots), X2 (Corneal xerosis), X3A/B (Corneal ulceration/Keratomalacia). * **Lissamine Green:** A newer alternative to Rose-Bengal that is better tolerated by patients as it causes less ocular irritation. * **Vitamin A Prophylaxis:** The first dose (1 lakh IU) is given at 9 months with Measles/MR vaccine; subsequent doses (2 lakh IU) are given every 6 months up to the age of 5 years (Total 9 doses/17 lakh IU).

Question 347: Which of the following has a low glycemic index?

A. Sucrose
B. Potato
C. Wheat bread
D. Rice (Correct Answer)

Explanation: **Explanation:** The **Glycemic Index (GI)** is a ranking of carbohydrates on a scale of 0 to 100 based on how quickly they raise blood glucose levels after consumption. Foods with a **Low GI (≤ 55)** are digested and absorbed slowly, causing a gradual rise in blood sugar, whereas **High GI (≥ 70)** foods cause rapid spikes. **Why Rice is the correct answer:** While the GI of rice varies significantly based on the variety and processing, certain types like **parboiled rice** or long-grain Basmati have a lower GI compared to refined wheat products and tubers. In the context of this specific comparison, rice (especially brown or parboiled) is often categorized as having a lower glycemic impact than white bread or mashed potatoes. *Note: In many standardized exams, rice is considered the "best fit" among these options, though clinical values can overlap.* **Analysis of Incorrect Options:** * **Sucrose (GI ~65):** A disaccharide (glucose + fructose). While it has a medium GI, it is a refined sugar that contributes to rapid metabolic shifts. * **Potato (GI ~80-90):** Potatoes, especially when boiled or mashed, have a very high GI because their starch is rapidly hydrolyzed into glucose. * **Wheat Bread (GI ~70-75):** Modern refined wheat bread (white bread) is a high GI food. Even whole wheat bread often has a GI similar to white bread due to the fine grinding of the flour. **High-Yield NEET-PG Pearls:** * **Low GI (<55):** Pulses, legumes, most fruits, and non-starchy vegetables. * **High GI (>70):** Glucose (Reference = 100), white bread, honey, and watermelons. * **Clinical Significance:** Low GI diets are preferred in the management of **Diabetes Mellitus** and **PCOS** to improve insulin sensitivity and satiety. * **Factors affecting GI:** Presence of fiber (lowers GI), cooking time (overcooking raises GI), and acidity (lowers GI).

Question 348: At what Body Mass Index (BMI) is obesity considered to start?

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

Explanation: **Explanation:** The Body Mass Index (BMI), or Quetelet Index, is the standard epidemiological tool used to classify weight 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 **World Health Organization (WHO)** classification for adults, **Obesity** is defined as a BMI **$\ge$ 30 $kg/m^2$**. This threshold is chosen because, at this level, the risk of co-morbidities (such as Type 2 Diabetes and Cardiovascular diseases) increases significantly. **2. Analysis of Incorrect Options:** * **Option A (25 $kg/m^2$):** This marks the beginning of the **'Overweight'** (Pre-obese) category (25.00–29.99 $kg/m^2$). * **Option C (35 $kg/m^2$):** This represents the start of **Class II Obesity** (35.00–39.99 $kg/m^2$). * **Option D (40 $kg/m^2$):** This is the threshold for **Class III Obesity** (Morbid Obesity). **3. High-Yield Facts for NEET-PG:** * **WHO Classification (Global):** * Underweight: < 18.5 * Normal: 18.5 – 24.9 * Overweight: 25 – 29.9 * Obesity: $\ge$ 30 * **Asia-Pacific (Indian) Guidelines:** Due to a higher risk of metabolic syndrome at lower BMIs in South Asians, the criteria are lower: * **Overweight:** 23 – 24.9 $kg/m^2$ * **Obesity:** $\ge$ 25 $kg/m^2$ * **Ponderal Index:** Another measure of obesity calculated as $Weight (kg) / Height^3 (m)$. * **Best Indicator of Abdominal Obesity:** Waist-to-Hip Ratio (Significant if > 0.9 in men and > 0.85 in women).

Question 349: What percentage of lactose is typically found in bovine milk?

A. 4% (Correct Answer)
B. 3%
C. 5%
D. 2%

Explanation: **Explanation:** The correct answer is **4%**. In Community Medicine and Nutrition, understanding the composition of milk is vital for pediatric nutrition and public health. Bovine (cow) milk typically contains approximately **4% to 4.5% lactose**. Lactose is a disaccharide composed of glucose and galactose, serving as the primary carbohydrate source in milk. **Why the other options are incorrect:** * **3% (Option B):** This value is closer to the **protein** content of cow's milk (approx. 3.2–3.5%). * **5% (Option C):** While some specific breeds may reach this level, the standard average used in medical examinations for cow's milk is 4%. However, **5%** is more characteristic of the lactose content in **Buffalo milk**. * **2% (Option D):** This is too low for natural whole milk; such values are only seen in commercially processed "low-fat" or "skimmed" milk variants where solids-not-fat (SNF) might be altered. **High-Yield Clinical Pearls for NEET-PG:** * **Human vs. Cow Milk:** Human milk has a significantly higher lactose content (**7%**) compared to cow milk (**4%**). This higher lactose level in humans facilitates the absorption of calcium and supports the development of the infant's brain and nervous system. * **Protein Content:** Cow milk has nearly triple the protein (**3.5%**) of human milk (**1.1%**), primarily consisting of **casein**, which forms a hard curd that is more difficult for infants to digest. * **Energy Value:** Both human and cow milk provide approximately **65–67 kcal per 100ml**. * **Mineral Content:** Cow milk is much richer in Calcium and Phosphorus, but human milk has better bioavailability of Iron.

Question 350: What is the recommended carbohydrate intake as a percentage of total energy for an ideal balanced diet?

A. 10-20% of total energy intake
B. 20-30% of total energy intake
C. 40-50% of total energy intake
D. 50-70% of total energy intake (Correct Answer)

Explanation: **Explanation:** In Community Medicine and Nutrition, a **Balanced Diet** is defined as one that contains all essential nutrients in correct proportions to maintain health and well-being. According to the World Health Organization (WHO) and the Indian Council of Medical Research (ICMR), the macronutrient distribution for an ideal balanced diet is: * **Carbohydrates:** 50–70% (The primary source of energy) * **Proteins:** 10–15% (Essential for growth and repair) * **Fats:** 15–30% (For essential fatty acids and fat-soluble vitamin absorption) **Why Option D is Correct:** Carbohydrates are the body's most economical and readily available source of energy. In the Indian context, where cereals form the staple diet, 50–70% of total caloric intake should come from carbohydrates, preferably complex ones (polysaccharides) rather than free sugars. **Why Other Options are Incorrect:** * **A (10-20%):** This range is too low and resembles a "Ketogenic Diet." It would lead to protein-energy malnutrition or excessive fat intake. * **B (20-30%):** This is the recommended range for **Fats**, not carbohydrates. * **C (40-50%):** While closer, this is still below the recommended threshold for a standard balanced diet, especially in developing nations where carbohydrate-rich staples are vital. **High-Yield NEET-PG Pearls:** * **Energy Density:** Carbohydrates and Proteins provide **4 kcal/g**, while Fats provide **9 kcal/g**. * **Dietary Fiber:** A subset of carbohydrates; the recommended intake is **~40g/2000 kcal**. * **Prudent Diet:** To prevent non-communicable diseases (NCDs), free sugar intake should be limited to **<10%** (ideally <5%) of total energy. * **Protein Quality:** Measured by Net Protein Utilization (NPU). Egg protein is the reference protein (NPU = 100).

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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