Nutrition and Health Practice Questions

Q: Iodine status in a population is best measured using which of the following?

Urinary iodine levels. ### Explanation **Correct Option: D. Urinary iodine levels** **Why it is correct:** Urinary Iodine Excretion (UIE) is the most sensitive and reliable indicator for assessing the iodine status of a **population**. Since approximately 90% of dietary iodine is excreted through the kidneys, urinary levels directly reflect recent dietary intake. For epidemiological surveys, a **median urinary iodine concentration (MUIC)** is used: * **Optimal:** 100–199 µg/L * **Deficiency:** 300 µg/L **Why other options are incorrect:** * **A & B (TSH, T3, T4):** While these are vital for diagnosing individual thyroid dysfunction (hypothyroidism/hyperthyroidism), they are poor indicators of population iodine status. Serum TSH is only sensitive for iodine status in **neonates**, not the general population. T3 and T4 levels often remain within normal limits even in moderate iodine deficiency due to compensatory mechanisms. * **C (Thyroglobulin):** This is a sensitive marker for long-term iodine nutrition in children and adults, but it is technically difficult to measure and lacks the standardized global reference ranges that make Urinary Iodine the "gold standard" for public health monitoring. **High-Yield NEET-PG Pearls:** 1. **Neonatal TSH:** The best indicator for monitoring the impact of iodine deficiency on the **developing brain** in a community. 2. **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. 3. **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. 4. **Standard Test:** The **Sandell-Kolthoff reaction** is the analytical method used to measure urinary iodine.

Q: What is the recommended percentage of fat intake in a prudent diet?

Less than 20-30%. ### Explanation **1. Understanding the Correct Answer (Option D: Less than 20-30%)** A **Prudent Diet** is a balanced dietary pattern designed to prevent chronic non-communicable diseases (NCDs) such as obesity, hypertension, and cardiovascular diseases. According to WHO and standard nutritional guidelines, the total fat intake in a prudent diet should be limited to **less than 20-30% of the total daily energy intake**. The goal is to provide enough essential fatty acids and fat-soluble vitamins while avoiding caloric excess. Within this 30%, the quality of fat matters: saturated fats should be <10%, and trans-fats should be <1% of total energy. **2. Analysis of Incorrect Options** * **Options A, B, and C:** These ranges (5% to 20%) are considered **too restrictive**. Very low-fat diets (below 15%) can lead to deficiencies in essential fatty acids (like Linoleic and Linolenic acid) and impair the absorption of fat-soluble vitamins (A, D, E, and K). Furthermore, extremely low fat intake often leads to a compensatory increase in refined carbohydrate consumption, which can elevate triglycerides and lower HDL levels. **3. High-Yield Clinical Pearls for NEET-PG** * **Dietary Fiber:** A prudent diet recommends an intake of **~40g/2000 kcal** (or 25-30g/day). * **Salt Intake:** Should be restricted to **less than 5g per day** to prevent hypertension. * **Refined Sugars:** Should constitute **less than 10%** (ideally <5%) of total energy. * **P:S Ratio:** The recommended Polyunsaturated to Saturated fatty acid ratio in a balanced diet is **0.8 to 1.0**. * **Cholesterol:** Dietary cholesterol should be limited to **less than 300 mg/day**.

Q: Height in centimeters divided by the cube root of body weight is also known as which index?

Ponderal index. **Explanation:** The correct answer is **C. Ponderal Index**. The **Ponderal Index (PI)**, also known as the Rohrer's Index, is a measure of leanness or "corpulence" of a person. It is calculated using the formula: $$\text{Ponderal Index} = \frac{\text{Height (cm)}}{\sqrt[3]{\text{Weight (kg)}}}$$ Unlike the Body Mass Index (BMI), which scales weight to the square of height, the Ponderal Index uses the cube root, making it more mathematically valid for assessing body composition across different heights, especially in newborns and pediatrics. **Analysis of Incorrect Options:** * **A. Quetelet Index:** This is the most common synonym for **Body Mass Index (BMI)**. It is calculated as $\text{Weight (kg)} / \text{Height (m)}^2$. It is the gold standard for epidemiological studies of obesity. * **B. Broca Index:** A simple formula used to estimate "Ideal Body Weight." It is calculated as: $\text{Height (cm)} - 100$. (e.g., if height is 170 cm, ideal weight is 70 kg). * **D. Corpulence Index:** While sometimes used interchangeably with Ponderal Index in older literature, in modern nutritional assessment, the Corpulence Index (or Kaup Index) specifically refers to the formula $\text{Weight (g)} / \text{Height (cm)}^2$, often used in infants. **High-Yield Clinical Pearls for NEET-PG:** * **Lorentz’s Formula:** A more refined version of the Broca index: $\text{Height (cm)} - 100 - [(\text{Height} - 150) / 4 \text{ (for males) or } 2 \text{ (for females)}]$. * **Best indicator of overweight in children:** BMI-for-age (Z-scores). * **Waist-Hip Ratio (WHR):** A WHR $>0.9$ in men and $>0.85$ in women indicates upper body (android) obesity and increased cardiovascular risk. * **Most sensitive marker of central obesity:** Waist circumference.

Q: Which food source has the highest biological value?

Egg. **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 essentially measures how efficiently the body utilizes the dietary protein. **1. Why Egg is the Correct Answer:** The **Egg** is considered the "Gold Standard" in nutrition because it contains all essential amino acids in the correct proportions required by the human body. It has a **Biological Value of approximately 94–96%** (often rounded to 100 in comparative indices). Because of its near-perfect amino acid profile, it is used as the reference protein against which all other food proteins are compared. **2. Analysis of Incorrect Options:** * **Milk:** While milk is a high-quality animal protein, its BV is approximately **84–90%**. It is slightly lower than egg because it is relatively lower in sulfur-containing amino acids. * **Soyabean:** This is the best plant-based protein source, but its BV is around **70–75%**. Like most legumes, it is deficient in methionine. * **Pulses:** Most pulses have a BV ranging from **50–70%**. They are generally limiting in methionine and cysteine, though they are rich in lysine. **3. NEET-PG High-Yield Pearls:** * **Net Protein Utilization (NPU):** For Egg, NPU is **100**, making it the most efficiently utilized protein. * **Reference Protein:** Egg is the standard reference protein used by the WHO. * **Limiting Amino Acids:** * Pulses/Cereals: Pulses are low in Methionine; Cereals are low in Lysine. * **Pulse-Cereal Mix:** Combining them (e.g., Khichdi) provides a complete amino acid profile (Supplementary action of proteins). * **Highest Protein Content:** While Egg has the highest *quality* (BV), **Soyabean** has the highest *quantity* of protein (approx. 40g/100g).

Q: Which of the following processes prevents lathyrism from Khesari dal?

Parboiling. **Explanation:** **Lathyrism** is a condition caused by the excessive consumption of *Lathyrus sativus* (Khesari dal), which contains the neurotoxin **BOAA (Beta-oxalyl-amino-alanine)**. To make the dal safe for consumption, the toxin must be removed. 1. **Why Parboiling is Correct:** **Parboiling** (steeping the seeds in hot water) is the most effective method for large-scale detoxification. BOAA is a water-soluble toxin. During parboiling, the dal is soaked in hot water for several hours and then drained. This process leaches out approximately **90% of the BOAA**, making the dal safe for consumption. 2. **Why Other Options are Incorrect:** * **Filtration:** This is a physical separation process used for liquids and solids; it has no effect on chemical toxins embedded within a seed. * **Sunlight exposure:** While UV rays can degrade some toxins, BOAA is heat-stable and resistant to light; sunlight does not neutralize it. * **Soaking:** While simple soaking in cold water can remove some toxin, it is significantly less efficient than parboiling or "steeping" in hot water, which is the standardized recommended preventive measure. **Clinical Pearls for NEET-PG:** * **The Toxin:** BOAA is also known as **ODAP** (Oxalyldiaminopropionic acid). * **Clinical Presentation:** It causes **Spastic Paraplegia** (upper motor neuron lesion) due to the destruction of pyramidal tracts. * **Stages:** It progresses through four stages: Latent, No-stick, One-stick, Two-stick, and Crawler stage. * **Lathyrism vs. Epidemic Dropsy:** Do not confuse these. Lathyrism is caused by Khesari dal (BOAA), while Epidemic Dropsy is caused by **Argemone mexicana** (Sanguinarine toxin) contaminating mustard oil. * **Home Method:** Another effective method is "Steeping," where dal is soaked in boiling water for 30–60 minutes and the water is discarded.

Q: According to WHO, what is the cut-off for the diagnosis of anemia in non-pregnant females?

12 g%. **Explanation:** The diagnosis of anemia is based on hemoglobin (Hb) levels falling below the established physiological requirements for an individual's age, sex, and physiological status (like pregnancy). According to the **WHO criteria**, the cut-off for anemia in **non-pregnant females (≥15 years of age)** is **<12 g/dL**. * **Why Option D is correct:** In non-pregnant adult females, the lower limit of normal hemoglobin is set at 12 g/dL. This threshold accounts for menstrual blood loss and lower androgen levels compared to males. * **Why Option C is incorrect:** **11 g/dL** is the WHO cut-off for **pregnant women** and **children aged 6–59 months**. During pregnancy, hemodilution (disproportionate increase in plasma volume over red cell mass) leads to a lower physiological cut-off. * **Why Option B is incorrect:** **10 g/dL** is often used as a threshold for "moderate anemia" (7.0–9.9 g/dL) but is not the diagnostic cut-off for the presence of anemia. * **Why Option A is incorrect:** **7 g/dL** is the threshold for **severe anemia**. Patients with Hb <7 g/dL often require urgent intervention or blood transfusion. **High-Yield Facts for NEET-PG:** * **Adult Males:** <13 g/dL * **Pregnant Females:** <11 g/dL * **Children (6 months to 5 years):** <11 g/dL * **Children (5 to 11 years):** <11.5 g/dL * **Children (12 to 14 years):** <12 g/dL * **Anemia Mukt Bharat (AMB) Strategy:** Uses a "6x6x6" strategy to combat anemia in India, targeting six age groups with six interventions and six institutional mechanisms.

Q: What is the percent of total energy supplied by fish protein (PE % Kcal)?

80%. ***80%*** - Fish is a **high-quality protein source** with minimal carbohydrates and fats, making protein contribute approximately **80% of total calories**. - This high **PE% Kcal** makes fish an excellent source for meeting **protein requirements** with relatively few calories. *20%* - This percentage is too low for fish protein and more representative of **mixed diets** or **carbohydrate-rich foods**. - Fish has much higher protein density compared to foods that would yield only **20% protein energy**. *40%* - This value is closer to **mixed protein sources** like eggs (~35%) but significantly underestimates fish protein contribution. - Fish has **minimal non-protein calories** from carbohydrates, making this percentage inadequate. *60%* - While higher than many foods, this still underestimates the **protein energy percentage** of fish. - Fish has very low **carbohydrate content** and moderate fat, allowing protein to dominate the caloric contribution more than 60%.

Q: Which of the following is not present in pulses?

Cysteine. **Explanation:** The correct answer is **Cysteine** (Option B). Pulses (legumes) are a vital source of dietary protein, especially in vegetarian populations. However, they are characterized by a specific amino acid profile that makes them an "incomplete" protein source. 1. **Why Cysteine is the correct answer:** Pulses are notoriously deficient in **sulfur-containing amino acids**, specifically **Methionine and Cysteine**. In the context of NEET-PG, Methionine is the most frequently cited deficiency, but Cysteine is also lacking. 2. **Why other options are incorrect:** * **Lysine:** Pulses are **rich in Lysine**. This is clinically significant because cereals (wheat, rice) are deficient in Lysine but rich in Methionine. * **Arginine:** This is a non-essential/semi-essential amino acid that is present in pulses. * **Protein:** Pulses are a major source of plant-based protein, typically containing **20-25% protein** by weight (Soybean being the highest at ~40%). **High-Yield NEET-PG Pearls:** * **Mutual Supplementation (Pulse-Cereal Mix):** To achieve a "complete" protein profile (Biological Value), pulses and cereals should be consumed together in a **1:4 ratio**. The Lysine from pulses compensates for the deficiency in cereals, while the Methionine from cereals compensates for the deficiency in pulses. * **Limiting Amino Acid:** The amino acid in shortest supply in a food is called the "limiting amino acid." For pulses, it is **Methionine**; for cereals, it is **Lysine**; for maize, it is **Tryptophan**. * **Anti-nutritional factors:** Pulses often contain phytates and tannins which can inhibit mineral absorption.

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

250 mcg. **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 1

Iodine status in a population is best measured using which of the following?

Accepted Answer

Urinary iodine levels

Answer

Thyroid Stimulating Hormone (TSH)

Answer

Thyroid hormones (T3, T4)

Answer

Thyroglobulin

Question 2

What is the recommended percentage of fat intake in a prudent diet?

Accepted Answer

Less than 20-30%

Answer

Less than 10-15%

Answer

Less than 5-10%

Answer

Less than 15-20%

Question 3

Height in centimeters divided by the cube root of body weight is also known as which index?

Accepted Answer

Ponderal index

Answer

Quetelet index

Answer

Broca index

Answer

Corpulence index

Question 4

Which of the following are suggestions to improve the nutritional value of the Mid-day meal program?

Accepted Answer

Sprouted pulses should be added as they have more nutrients.

Answer

The cereals to pulse ratio should be 1:3.

Answer

Rice water left after cooking should be mixed with dal.

Answer

Food grains should be stored away from moist areas.

Question 5

Which food source has the highest biological value?

Accepted Answer

Egg

Answer

Milk

Answer

Soyabean

Answer

Pulses

Question 6

Which of the following processes prevents lathyrism from Khesari dal?

Accepted Answer

Parboiling

Answer

Filtration

Answer

Sunlight exposure

Answer

Soaking

Question 7

According to WHO, what is the cut-off for the diagnosis of anemia in non-pregnant females?

Accepted Answer

12 g%

Answer

7 g%

Answer

10 g%

Answer

11 g%

Question 8

What is the percent of total energy supplied by fish protein (PE % Kcal)?

Accepted Answer

80%

Answer

20%

Answer

40%

Answer

60%

Question 9

Which of the following is not present in pulses?

Accepted Answer

Cysteine

Answer

Lysine

Answer

Arginine

Answer

Protein

Question 10

What is the recommended daily iodine intake for pregnant women?

Accepted Answer

250 mcg

Answer

75 mcg

Answer

100 mcg

Answer

150 mcg

Nutrition and Health — MCQs

Nutrition and Health — MCQs

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