Nutrition and Health Practice Questions

Q: What is the best test to detect iron deficiency in a community setting?

Serum ferritin. **Explanation:** The correct answer is **Serum Ferritin**. **Why Serum Ferritin is the Correct Choice:** Serum ferritin is the most sensitive and specific indicator of iron stores in the body. In the progression of iron deficiency, the **depletion of iron stores** is the earliest stage. Since serum ferritin levels correlate directly with total body iron stores, a low level is the first laboratory abnormality to appear, often before any clinical symptoms or changes in red blood cell morphology occur. In a community setting, it serves as the "gold standard" for assessing iron status and identifying subclinical deficiency. **Analysis of Incorrect Options:** * **Serum Transferrin:** This reflects the iron-binding capacity. While it increases in iron deficiency, it is less specific than ferritin and is influenced by protein-energy malnutrition and liver disease. * **Serum Iron:** This measures the iron currently circulating in the blood. Levels fluctuate significantly based on recent dietary intake, diurnal variation, and inflammatory states, making it an unreliable indicator of overall iron status. * **Hemoglobin:** While commonly used for screening **anemia**, it is a late indicator of iron deficiency. Hemoglobin levels only drop after iron stores are completely exhausted (Iron Deficiency Anemia). It cannot detect the early "pre-anemic" stages of iron depletion. **High-Yield Pearls for NEET-PG:** * **Earliest indicator of iron deficiency:** Low serum ferritin. * **Earliest hematological change:** Increased Red Cell Distribution Width (RDW). * **Best indicator of iron deficiency erythropoiesis:** Soluble Transferrin Receptor (sTfR) – *Note: This is not affected by inflammation.* * **Limitation of Ferritin:** It is an **acute-phase reactant**. Levels may be falsely normal or high in the presence of infection, inflammation, or malignancy, even if iron deficiency coexists.

Q: What is the best test to detect iron deficiency anemia in a community with low prevalence of iron deficiency?

Serum ferritin. **Explanation:** The correct answer is **Serum ferritin**. In the context of community screening, especially in low-prevalence areas, the goal is to identify individuals in the earliest stages of iron depletion before clinical anemia develops. **Why Serum Ferritin is the Correct Answer:** Serum ferritin is the most sensitive and specific indicator of total body iron stores. In the progression of iron deficiency, **depletion of iron stores** (Stage 1) occurs long before changes in serum iron or hemoglobin levels. Therefore, in a community with low prevalence, ferritin can detect "pre-latent" iron deficiency. It is considered the "Gold Standard" biochemical test for diagnosing iron deficiency in a population. **Analysis of Incorrect Options:** * **Packed Cell Volume (PCV) / Hemoglobin:** These are markers of **Iron Deficiency Anemia** (Stage 3). They only decrease after iron stores are exhausted and erythropoiesis is impaired. They lack sensitivity for early detection. * **Serum Iron:** This reflects iron currently in transport, not stored iron. Levels fluctuate significantly due to diurnal variation, recent dietary intake, or infection, making it an unreliable screening tool. * **Total Iron Binding Capacity (TIBC):** While TIBC increases in iron deficiency, it is less sensitive than ferritin and can be affected by liver function and nutritional status (protein intake). **High-Yield Clinical Pearls for NEET-PG:** * **Earliest finding in Iron Deficiency:** Decreased Serum Ferritin. * **Earliest morphological change in RBCs:** Increased RDW (Red Cell Distribution Width). * **Limitation:** Ferritin is an **acute-phase reactant**. It may be falsely elevated in the presence of infection, inflammation, or malignancy, even if iron stores are low. * **Cut-off:** A serum ferritin level **<15 μg/L** is highly specific for iron deficiency.

Q: On the basis of Body Mass Index (BMI), at what value is obesity typically labeled?

30. **Explanation:** The Body Mass Index (BMI), or Quetelet index, is the standard epidemiological tool used 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 C is Correct:** According to the **World Health Organization (WHO)** classification, **Obesity** is defined as a BMI **$\ge$ 30 $kg/m^2$**. This threshold 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 (20):** This falls within the **Normal range** (18.5–24.9 $kg/m^2$). * **Option B (25):** This is the cutoff for **Overweight** (Pre-obese). A BMI of 25.0–29.9 $kg/m^2$ indicates an increased health risk but is not yet classified as clinical obesity. * **Option D (18):** A BMI below 18.5 $kg/m^2$ is classified as **Underweight**, indicating chronic energy deficiency. **High-Yield Clinical Pearls for NEET-PG:** * **Asian-Indian Specific Cutoffs:** Due to a higher percentage of body fat at lower BMIs, the consensus criteria for Indians are lower: * **Overweight:** 23–24.9 $kg/m^2$ * **Obesity:** $\ge$ 25 $kg/m^2$ * **WHO Obesity Grading:** * Class I: 30.0–34.9 * Class II: 35.0–39.9 * Class III (Morbid): $\ge$ 40.0 * **Ponderal Index:** Another measure of leaness ($kg/m^3$), often used in pediatrics. * **Waist-Hip Ratio:** A better predictor of metabolic risk than BMI alone (Significant if $>0.9$ in men or $>0.85$ in women).

Q: Fat provides what percentage of the body's total calories?

30%. In balanced nutrition, the distribution of macronutrients is essential for maintaining metabolic homeostasis. According to the World Health Organization (WHO) and standard Indian dietary guidelines (ICMR), the recommended distribution of total energy intake is as follows: **1. Why 30% is Correct:** In a balanced diet, fats should ideally contribute between **20% to 30%** of the total daily caloric intake. This range ensures the body receives essential fatty acids and fat-soluble vitamins (A, D, E, K) without increasing the risk of obesity or cardiovascular diseases. In most competitive exams like NEET-PG, 30% is the standard upper limit cited for a healthy individual. **2. Why Incorrect Options are Wrong:** * **A (40%) & C (50%):** These represent high-fat diets. Consuming >35% of calories from fat is associated with an increased risk of atherosclerosis, coronary heart disease, and metabolic syndrome. * **D (75%):** This is characteristic of a "Keto" or therapeutic diet used for specific conditions like refractory epilepsy, but it is not the physiological norm for the general population. **3. High-Yield NEET-PG Pearls:** * **Caloric Value:** Fat is the most energy-dense macronutrient, providing **9 kcal/g**, compared to 4 kcal/g for proteins and carbohydrates. * **Carbohydrate Contribution:** The majority of body calories (**50–70%**) should come from carbohydrates. * **Protein Contribution:** Proteins should provide **10–15%** of total calories. * **Saturated Fat Limit:** For heart health, saturated fats should constitute less than **10%** of total energy intake. * **Essential Fatty Acids:** Linoleic acid (Omega-6) and Alpha-linolenic acid (Omega-3) must be provided by the diet as the body cannot synthesize them.

Q: What is the daily protein requirement for a 2-year-old child?

20 gm. **Explanation:** The protein requirement for children is determined by the **ICMR-NIN (2020) guidelines**, which are the standard reference for NEET-PG. For a 2-year-old child (falling in the 1–3 years age group), the Recommended Dietary Allowance (RDA) for protein is approximately **1.13 g/kg/day**. Given that the average weight of a 2-year-old is roughly 12–13 kg, the total daily requirement calculates to approximately **12.5–15 g/day** of reference protein. However, in the context of typical Indian mixed diets with lower bioavailability, the practical recommendation is often rounded to **20 g/day** to ensure adequate growth and tissue repair. **Analysis of Options:** * **Option C (20 gm):** This is the most accurate clinical estimate for a toddler. It accounts for the rapid growth phase and the metabolic demands of a child transitioning to a complete family diet. * **Option A (10 gm):** This is insufficient. A 10g intake is closer to the requirement of an infant (6–12 months), which is roughly 10.5 g/day. * **Option B (15 gm):** While 15g is the physiological minimum (RDA), 20g is the standard "safe" clinical answer used in exams to account for protein quality and growth spurts. * **Option D (25 gm):** This is excessive for a 2-year-old and is closer to the requirement for school-aged children (6–9 years). **High-Yield Clinical Pearls for NEET-PG:** * **Protein Energy Malnutrition (PEM):** Deficiency leads to Kwashiorkor (characterized by edema and hypoalbuminemia) or Marasmus (generalized wasting). * **Reference Protein:** Egg protein is considered the reference protein (100% bioavailability). * **Growth Rule:** A child’s weight triples by 1 year and quadruples by 2 years. Protein intake must scale with this rapid weight gain. * **Energy-Protein Ratio:** In a healthy diet, protein should contribute roughly **10–15%** of the total daily caloric intake.

Q: Which field instrument is used to measure body weight?

Salter's spring balance. **Explanation:** In community medicine and field-based nutrition surveys (like those conducted by ICDS or NFHS), the **Salter’s spring balance** is the gold standard for measuring the weight of infants and young children (up to 25 kg). **Why Salter’s Spring Balance is Correct:** The Salter scale is specifically designed for **field use** because it is lightweight, portable, and does not require electricity. It consists of a hook and a circular dial. The child is placed in a "sling" or "weighing pants" attached to the hook. It is highly durable and allows for quick measurements in rural or remote settings where sophisticated equipment is impractical. **Analysis of Incorrect Options:** * **Electronic weighing scale:** While highly accurate and used in clinical settings (hospitals/clinics), these are often less preferred for rugged field use due to their dependence on batteries/electricity and sensitivity to uneven terrain. * **Mass produced balance scale:** These are standard commercial scales (like those in markets) and lack the precision and standardized calibration required for medical anthropometry. * **Roberval balance:** This is a classic "two-pan" balance. While used in some laboratories, it is bulky, difficult to transport, and not used for human anthropometry in the field. **High-Yield Clinical Pearls for NEET-PG:** * **Growth Monitoring:** Weight-for-age is the primary indicator used on the **WHO Growth Chart** (Road to Health Chart) to detect early protein-energy malnutrition (PEM). * **Zeroing:** Always ensure the Salter scale is adjusted to "zero" with the empty weighing pants attached before placing the child. * **Other Field Instruments:** * **Length ( 2 years):** Measured using a **Stadiometer** (Standing height). * **MUAC:** Measured using **Shakir’s Tape**.

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

Sullivan's index. **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 $\geq 25$).

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

200000 IU. ### 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 1

What is the best test to detect iron deficiency in a community setting?

Accepted Answer

Serum ferritin

Answer

Serum transferrin

Answer

Serum iron

Answer

Hemoglobin

Question 2

What is the best test to detect iron deficiency anemia in a community with low prevalence of iron deficiency?

Accepted Answer

Serum ferritin

Answer

Packed Cell Volume (PCV)

Answer

Serum iron

Answer

Iron binding capacity

Question 3

Which of the following is a preventable cause of mental retardation?

Accepted Answer

Cretinism

Answer

Down syndrome

Answer

Phenylketonuria

Answer

Cerebral palsy

Question 4

On the basis of Body Mass Index (BMI), at what value is obesity typically labeled?

Accepted Answer

30

Answer

20

Answer

25

Answer

18

Question 5

Fat provides what percentage of the body's total calories?

Accepted Answer

30%

Answer

40%

Answer

50%

Answer

75%

Question 6

What is the daily protein requirement for a 2-year-old child?

Accepted Answer

20 gm

Answer

10 gm

Answer

15 gm

Answer

25 gm

Question 7

Which field instrument is used to measure body weight?

Accepted Answer

Salter's spring balance

Answer

Electronic weighing scale

Answer

Mass produced balance scale

Answer

Roberval balance

Question 8

What is the estimated daily energy requirement in kcal for a pregnant woman weighing 55 kg who engages in moderate physical activity?

Accepted Answer

2580 kcal

Answer

2280 kcal

Answer

2730 kcal

Answer

2630 kcal

Question 9

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

Accepted Answer

Sullivan's index

Answer

Quetelet's index

Answer

Broca index

Answer

Corpulence index

Question 10

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

Accepted Answer

200000 IU

Answer

2000 IU

Answer

20000 IU

Answer

100000 IU

Nutrition and Health — MCQs

Nutrition and Health — MCQs

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