Nutrition and Health Practice Questions

Q: Which of the following statements about Recommended Daily Allowance (RDA) is false?

The RDA caters to the dietary requirement of all people.. ### Explanation **Why Option B is the Correct Answer (The False Statement):** The Recommended Daily Allowance (RDA) is defined as the average daily dietary nutrient intake level that is sufficient to meet the nutrient requirements of nearly all (**97–98%**) healthy individuals in a particular life stage and gender group. It does **not** cater to "all" people because it excludes individuals with specific clinical conditions, metabolic disorders, or chronic illnesses who may have significantly higher or lower requirements. Therefore, stating it caters to "all people" is technically incorrect in a medical context. **Analysis of Other Options:** * **Option A:** Correct. RDAs are formulated by expert committees (like ICMR-NIN in India) based on rigorous scientific data regarding nutrient metabolism and deficiency prevention. * **Option C:** Correct. The RDA is intentionally set higher than the minimum requirement to provide a "safety margin" that accounts for individual variations and ensures that the needs of the vast majority of the population are met. * **Option D:** Correct. The mathematical formula for RDA is **RDA = EAR + 2 SD** (Standard Deviation). The Estimated Average Requirement (EAR) meets the needs of 50% of the population; the RDA builds upon this to cover 97.5%. **High-Yield Clinical Pearls for NEET-PG:** * **RDA Formula:** RDA = EAR + 2 SD (Standard Deviation of the requirement). * **Energy Exception:** For **Energy (Calories)**, the RDA is set exactly at the **EAR**. This is to prevent overconsumption and the subsequent risk of obesity. * **Reference Indian Adult:** The 2020 ICMR-NIN guidelines define the reference man and woman as aged **19–39 years** with a body weight of **65 kg** and **55 kg**, respectively. * **Safe Intake:** For nutrients like proteins and vitamins, the RDA is the "Safe Level of Intake."

Q: What is the net protein utilization of egg?

96. **Explanation:** The correct answer is **96**. Net Protein Utilization (NPU) is a measure of protein quality that represents the proportion of dietary protein retained by the body. It is calculated as: *NPU = (Nitrogen Retained / Nitrogen Intake) × 100.* Egg protein is considered the **"Reference Protein"** in human nutrition because it contains all essential amino acids in the ideal proportions required by the human body. It has the highest NPU among all natural foods, making it the gold standard for comparing the quality of other proteins. **Analysis of Options:** * **Option A (96):** This is the standard NPU value for a whole egg. Because of its near-perfect digestibility and amino acid profile, almost all the protein consumed is utilized for tissue building. * **Option B (81):** This is the approximate NPU for **Milk**. While high, it is slightly lower than egg due to different amino acid concentrations. * **Option C (79):** This is the approximate NPU for **Meat/Fish**. Animal muscle proteins are high quality but slightly less efficient in utilization compared to eggs. * **Option D (45-50):** This range represents the NPU of many **Vegetable proteins** (e.g., pulses, Bengal gram). Most plant proteins are "incomplete" as they lack one or more essential amino acids (limiting amino acids). **High-Yield Pearls for NEET-PG:** 1. **Biological Value (BV):** For Egg is **94** (Note: NPU = BV × Digestibility coefficient). 2. **Protein Efficiency Ratio (PER):** For Egg is **4.5**. 3. **Limiting Amino Acids:** Pulses are deficient in **Methionine**, while Cereals are deficient in **Lysine**. 4. **Reference Protein:** Egg is used as the reference protein because its amino acid score is **100**.

Q: Which of the following can cause lathyrism?

Khesari dal. **Explanation:** **Lathyrism** is a non-fungal nutritional toxicoses caused by the excessive consumption of **Khesari dal (*Lathyrus sativus*)**. This pulse contains a potent neurotoxin known as **BOAA (Beta-oxalyl-amino-alanine)**, also referred to as ODAP. When Khesari dal constitutes more than 30% of the total calorie intake over a period of 2–6 months, it leads to **Neurolathyrism**, characterized by spastic paraplegia. * **Why Khesari dal is correct:** It is a hardy, drought-resistant crop often consumed by landless laborers during famines. The BOAA toxin causes the death of upper motor neurons, leading to a characteristic "scissor gait." * **Why other options are wrong:** Moong dal, Chana dal, and Masoor dal are common edible pulses consumed across India. They do not contain neurotoxic amino acids like BOAA and are safe for human consumption as primary protein sources. **High-Yield Clinical Pearls for NEET-PG:** 1. **Stages of Lathyrism:** * *Latent stage:* No symptoms, but positive "Treadmill test." * *No-stick stage:* Short steps, jerky gait. * *One-stick/Two-stick stage:* Progressive difficulty in walking. * *Crawler stage:* Permanent disability; the patient can only crawl. 2. **Prevention:** * **Steeping method:** Soaking dal in hot water (removes 90% of toxin). * **Parboiling:** Similar to rice processing. * **Banning:** The sale of Khesari dal was historically banned in many Indian states to prevent outbreaks. 3. **Target Population:** Most commonly affects young adult males (15–45 years).

Q: Milk is deficient in which of the following nutrients?

Iron. **Explanation:** Milk is often described as a "nearly complete food" because it contains most essential nutrients required for growth and development. However, it is notoriously deficient in two primary nutrients: **Iron** and **Vitamin C**. **1. Why Iron is the Correct Answer:** Milk contains negligible amounts of iron (approximately 0.1 mg per 100g). If an infant is exclusively breastfed or fed cow’s milk beyond six months of age without appropriate complementary feeding, they are at a high risk of developing **Iron Deficiency Anemia (IDA)**. This is a classic "high-yield" concept in pediatrics and community medicine. **2. Analysis of Incorrect Options:** * **A. Calcium:** Milk is one of the richest dietary sources of bioavailable calcium, essential for bone mineralization. * **B. Vitamin A:** Milk and dairy products are excellent sources of fat-soluble Vitamin A (Retinol), especially if the milk has a high fat content. * **C. Vitamin D:** While natural levels can vary, milk contains Vitamin D. In many regions, milk is also fortified with Vitamin D to prevent rickets. **3. NEET-PG High-Yield Pearls:** * **The "Two Deficiencies":** Always remember that milk is deficient in **Iron** and **Vitamin C**. * **The "Two Minerals":** Milk is rich in **Calcium** and **Phosphorus**, but poor in **Iron** and **Copper**. * **Goat Milk:** Specifically deficient in **Folic Acid**, which can lead to megaloblastic anemia in infants fed exclusively on goat milk. * **Milk Proteins:** The primary protein in milk is **Casein**, while the primary carbohydrate is **Lactose**. * **Pasteurization:** This process destroys the enzyme phosphatase (used as a check for pasteurization efficiency) and reduces Vitamin C content further, but does not significantly affect the protein or mineral value.

Q: Sorghum contains a good amount of which amino acid?

Leucine. **Explanation:** The correct answer is **Leucine**. **1. Why Leucine is correct:** Sorghum (Jowar) is unique among cereals because it contains a disproportionately high concentration of the amino acid **Leucine**. While most cereals are deficient in certain essential amino acids, sorghum's high leucine content is clinically significant. Excess leucine interferes with the conversion of Tryptophan to Niacin (Vitamin B3) by inhibiting the enzyme *quinolinate phosphoribosyl transferase (QPRT)*. This biochemical imbalance leads to a secondary deficiency of Niacin, which is the underlying cause of **Pellagra** in populations where sorghum is the staple diet. **2. Analysis of Incorrect Options:** * **Lysine:** This is the **limiting amino acid** in almost all cereals, including sorghum. Cereals are characteristically deficient in lysine but rich in methionine. * **Arginine & Histidine:** These are semi-essential amino acids. While present in grains, they are not found in excess in sorghum and do not have the specific clinical association with disease (like the Leucine-Pellagra link) that makes Leucine a high-yield topic for exams. **3. Clinical Pearls for NEET-PG:** * **The Pellagra Connection:** Pellagra is traditionally associated with **Maize** (due to bound niacin/niacytin) and **Sorghum** (due to high leucine). * **Limiting Amino Acids:** * Cereals: Lysine (Deficient), Methionine (Rich). * Pulses: Methionine (Deficient), Lysine (Rich). * **Mutual Supplementation:** This is why a cereal-pulse combination (e.g., Dal-Chawal) provides a complete protein profile, as they compensate for each other's deficiencies. * **Pellagra Symptoms (4 Ds):** Dermatitis (Casal’s necklace), Diarrhea, Dementia, and Death.

Q: What is the recommended daily protein intake (in gm/kg/day) for a female child aged 13-15 years?

0.95. This question is based on the **ICMR-NIN (2020) Dietary Guidelines for Indians**, which revised the Recommended Dietary Allowances (RDA) for various age groups. ### **Explanation of the Correct Answer** **Option A (0.95 gm/kg/day)** is the correct RDA for a female child aged **13–15 years**. During adolescence, protein requirements are elevated to support the rapid "pubertal growth spurt," lean body mass development, and hormonal changes. The ICMR 2020 guidelines shifted from a fixed gram-per-day value to a weight-based calculation for children and adolescents to ensure precision based on growth velocity. ### **Analysis of Incorrect Options** * **Option B (0.68 gm/kg/day):** This is the RDA for **sedentary adult males and females**. In the 2020 guidelines, the protein requirement for adults was reduced from 1.0 g/kg to 0.83 g/kg (estimated average requirement) with an RDA of 0.66–0.83 g/kg. * **Option C (1.00 gm/kg/day):** This was the older RDA (ICMR 2010) for most age groups. It is no longer the standard for the 13–15 age bracket under the revised 2020 guidelines. * **Option D (1.33 gm/kg/day):** This value is significantly higher and is more characteristic of the protein requirements for **infants (6–12 months)**, who require higher protein density per kg of body weight for rapid initial growth. ### **High-Yield NEET-PG Pearls** * **Reference Body Weight (ICMR 2020):** Adult Male = 65 kg; Adult Female = 55 kg. * **Adolescent Protein (13–15 yrs):** Boys require **0.90 g/kg/day**, while Girls require **0.95 g/kg/day**. Note that girls have a slightly higher requirement per kg in this specific bracket due to earlier pubertal onset. * **Pregnancy/Lactation:** Always remember to add the "additional" protein requirements to the base RDA (e.g., +22.0 g/day in the 3rd trimester). * **Net Protein Utilization (NPU):** The safe intake is calculated based on a protein quality (NPU) of 100.

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**.

Question 1

Which of the following statements about Recommended Daily Allowance (RDA) is false?

Accepted Answer

The RDA caters to the dietary requirement of all people.

Answer

The RDA is decided by a panel of experts and is based on scientific research.

Answer

The RDA is often higher than the recommended minimum requirement.

Answer

The RDA is based on the Estimated Average Requirement (EAR).

Question 2

What is the net protein utilization of egg?

Accepted Answer

96

Answer

81

Answer

79

Answer

45-50

Question 3

Which of the following can cause lathyrism?

Accepted Answer

Khesari dal

Answer

Moong dal

Answer

Chana dal

Answer

Masoor dal

Question 4

Cereals and pulses are considered complementary in terms of protein content because?

Accepted Answer

Cereals are deficient in lysine, and pulses are deficient in methionine.

Answer

Cereals are deficient in methionine.

Answer

Cereals are deficient in methionine, and pulses are deficient in lysine.

Answer

Cereal proteins contain primarily non-essential amino acids, while pulse proteins contain essential amino acids.

Question 5

What is true about Iodine deficiency disorders?

Accepted Answer

A goitre prevalence of >10% in an area is considered as endemicity.

Answer

Exclusively found in the Himalayan goitre belt.

Answer

Only monitored by blood thyroid tests.

Answer

Includes only goitre.

Question 6

Milk is deficient in which of the following nutrients?

Accepted Answer

Iron

Answer

Calcium

Answer

Vitamin A

Answer

Vitamin D

Question 7

Sorghum contains a good amount of which amino acid?

Accepted Answer

Leucine

Answer

Lysine

Answer

Arginine

Answer

Histidine

Question 8

What is the recommended daily protein intake (in gm/kg/day) for a female child aged 13-15 years?

Accepted Answer

0.95

Answer

0.68

Answer

1.00

Answer

1.33

Question 9

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 10

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%

Nutrition and Health — MCQs

Nutrition and Health — MCQs

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