Nutrition and Health Practice Questions

Q: What is the estimated daily caloric requirement for an adult male worker with moderate activity levels?

2730 Kcal/day. This question is based on the **ICMR-NIN (2020) Expert Group Report** on Nutrient Requirements for Indians. The caloric requirement for an adult male is categorized based on the intensity of physical activity: Sedentary, Moderate, and Heavy. ### **Explanation of the Correct Answer** **C. 2730 Kcal/day** is the correct RDA (Recommended Dietary Allowance) for an **adult male (Reference body weight: 65 kg) performing moderate activity**. Moderate activity includes occupations like fisherman, carpenters, or weavers. The calculation is based on the Estimated Energy Requirement (EER) needed to maintain energy balance for this specific activity level. ### **Analysis of Incorrect Options** * **A. 2320 Kcal/day:** This is the requirement for an adult male with **Sedentary activity** (e.g., office workers, teachers). * **B. 2230 Kcal/day:** This is the requirement for an **adult female** with **Moderate activity** (Reference weight: 55 kg). * **D. 3490 Kcal/day:** This is the requirement for an adult male performing **Heavy activity** (e.g., stone cutters, blacksmiths, mine workers). ### **High-Yield Clinical Pearls for NEET-PG** * **Reference Body Weight (2020 Update):** The reference weight for an Indian Adult Male is **65 kg** and for an Adult Female is **55 kg** (increased from the previous 60 kg and 50 kg respectively). * **Pregnancy:** There is **no additional** calorie requirement in the 1st trimester. Add **+350 kcal/day** in the 2nd trimester and **+525 kcal/day** in the 3rd trimester. * **Lactation:** Add **+600 kcal/day** (0-6 months) and **+520 kcal/day** (6-12 months). * **Protein Requirement:** The current recommendation is **0.83 g/kg body weight/day** for both adult males and females.

Q: Which vitamin is absent in eggs?

Vitamin C. **Explanation:** The correct answer is **Vitamin C**. Eggs are often described as a "complete food" because they contain almost all essential nutrients required for life; however, they are notably deficient in Vitamin C (Ascorbic acid). **1. Why Vitamin C is the correct answer:** Vitamin C is primarily found in citrus fruits and fresh vegetables. In the biological context of an egg, the developing embryo (chick) is capable of synthesizing its own Vitamin C from glucose in the liver and kidneys. Therefore, the egg does not need to store pre-formed Vitamin C, making it the only major vitamin absent in this food source. **2. Analysis of Incorrect Options:** * **Vitamin B1 (Thiamine):** Present in the egg yolk. It is essential for the carbohydrate metabolism of the developing embryo. * **Vitamin B6 (Pyridoxine):** Found in significant amounts in eggs, contributing to amino acid metabolism. * **Vitamin E (Tocopherol):** Eggs are a good source of fat-soluble vitamins (A, D, E, and K), which are concentrated in the lipid-rich egg yolk. **High-Yield NEET-PG Pearls:** * **The "Egg Rule":** Eggs contain all vitamins **EXCEPT Vitamin C**. * **Mineral Deficiency:** While rich in iron, the iron in eggs is bound to **phosvitin**, which inhibits its absorption. Eggs are also considered a poor source of **Calcium** (as most calcium is in the shell, not the edible portion). * **Reference Protein:** Egg protein is considered the "Standard Protein" (Biological Value = 100) against which all other proteins are compared. * **Avidin:** Raw egg whites contain avidin, which binds to **Biotin** (Vitamin B7), potentially leading to deficiency if consumed in large quantities.

Q: Among the pulses, which one contains the highest quantity of protein?

Soyabean. **Explanation:** The correct answer is **Soyabean**. In the context of Community Medicine and Nutrition, pulses are essential plant-based sources of protein, but their protein content varies significantly. **1. Why Soyabean is Correct:** Soyabean (*Glycine max*) is considered a "gold standard" among plant proteins. It contains approximately **40-43% protein**, which is nearly double the amount found in most other pulses. Unlike most plant sources, soy protein is a "complete protein," containing all essential amino acids in sufficient quantities, making its biological value superior to other legumes. **2. Analysis of Incorrect Options:** * **Green gram (Moong dal):** Contains approximately **24-25%** protein. It is highly digestible and often recommended for therapeutic diets, but its protein density is lower than soyabean. * **Red gram (Arhar/Tur dal):** Contains approximately **22-23%** protein. It is a staple in Indian diets but ranks lower in total protein content. * **Black gram (Urad dal):** Contains approximately **24%** protein. While rich in phosphoric acid, it does not match the protein concentration of soyabean. **3. High-Yield Clinical Pearls for NEET-PG:** * **Limiting Amino Acid:** Most pulses are deficient in **Methionine** but rich in **Lysine**. Conversely, cereals are deficient in Lysine but rich in Methionine. This is why a cereal-pulse combination (e.g., Khichdi) provides a complete amino acid profile (Mutual Supplementation). * **Antinutritional Factors:** Soyabeans contain a **Trypsin inhibitor**, which must be inactivated by heat (cooking) to ensure proper protein absorption. * **Lathyrism:** Consumption of *Khesari Dal* (Lathyrus sativus) is associated with Neurolathyrism due to the toxin **BOAA** (Beta-oxalyl-amino-alanine). * **Reference Protein:** Egg is considered the reference protein (Biological Value = 100).

Q: James Lind is known for what contribution?

Prevention of scurvy by fruits. **Explanation:** **James Lind** (1716–1794), a Scottish naval surgeon, is celebrated for conducting one of the first clinical trials in medical history. In 1747, while serving on the HMS Salisbury, he observed that sailors suffered severely from **scurvy** (Vitamin C deficiency). He divided 12 scorbutic patients into six groups, providing each with different dietary supplements. The group given **citrus fruits (oranges and lemons)** showed miraculous recovery, proving that scurvy was a nutritional deficiency preventable by fresh fruit consumption. **Analysis of Incorrect Options:** * **A. Germ theory of disease:** This was primarily established by **Louis Pasteur** and **Robert Koch** in the late 19th century, shifting the focus from "miasma" to microorganisms as the cause of infection. * **B. Multifactorial causation of disease:** This concept, which posits that diseases (especially non-communicable ones) result from an interaction of multiple factors, was popularized much later (e.g., by Pettenkofer and modern epidemiologists). * **D. None of the above:** Incorrect, as Lind’s contribution to nutritional epidemiology is well-documented. **High-Yield Clinical Pearls for NEET-PG:** * **Scurvy:** Caused by deficiency of **Vitamin C (Ascorbic acid)**, which is essential for collagen synthesis (specifically the hydroxylation of proline and lysine). * **Clinical Signs:** Bleeding gums, perifollicular hemorrhages, "corkscrew" hairs, and impaired wound healing. * **Historical Context:** James Lind is often referred to as the **"Father of Naval Hygiene."** * **Epidemiological Significance:** His work is a classic example of a **Controlled Trial**, even before the formalization of modern statistics.

Q: One mg of Niacin is produced by how many mg of Tryptophan?

60. **Explanation:** The correct answer is **60 mg**. This is a fundamental concept in nutritional biochemistry regarding the synthesis of Niacin (Vitamin B3). **1. The Underlying Concept:** Niacin can be obtained directly from the diet or synthesized endogenously from the essential amino acid **Tryptophan**. This conversion occurs primarily in the liver. The established metabolic ratio is that **60 mg of dietary Tryptophan yields 1 mg of Niacin**. This relationship is expressed as "Niacin Equivalents" (NE), where 1 NE = 1 mg Niacin or 60 mg Tryptophan. This conversion requires cofactors, specifically Vitamin B6 (Pyridoxine), Vitamin B2 (Riboflavin), and Iron. **2. Analysis of Options:** * **Option D (60):** This is the standard physiological conversion ratio recognized by the WHO and ICMR. * **Options A, B, and C (22, 37, 55):** These values do not correspond to any recognized metabolic conversion ratio for Niacin synthesis in humans. They are distractors often used in medical exams to test precise recall of nutritional constants. **3. High-Yield Clinical Pearls for NEET-PG:** * **Pellagra:** A deficiency of Niacin characterized by the **4 Ds**: Dermatitis (Casal’s necklace), Diarrhea, Dementia, and Death. * **Hartnup Disease:** A genetic disorder involving defective tryptophan absorption, leading to pellagra-like symptoms. * **Carcinoid Syndrome:** Can lead to Niacin deficiency because tryptophan is diverted to produce excessive amounts of Serotonin (5-HT) instead of Niacin. * **Maize/Corn Diets:** Predispose individuals to Pellagra because maize is low in tryptophan and its niacin is in a bound, non-bioavailable form (niacytin).

Q: Vitamin B12 is not found in which of the following?

Soyabean. **Explanation:** **Core Concept:** Vitamin B12 (Cyanocobalamin) is unique among vitamins because it is synthesized exclusively by microorganisms (bacteria and archaea). In the food chain, it is found almost entirely in **animal-based foods**. Plants do not require B12 for their metabolic processes and therefore do not synthesize or store it. **Why Soyabean is the Correct Answer:** Soyabean is a legume (plant source). Like all other unfortified plant foods, it naturally lacks Vitamin B12. While some fermented soy products (like tempeh) may contain trace amounts due to bacterial fermentation during processing, pure soyabean is considered a B12-deficient food. This is why strict vegetarians and vegans are at a high risk for B12 deficiency. **Analysis of Incorrect Options:** * **Milk:** While lower in concentration than meat, dairy products are a significant source of B12 for lacto-vegetarians. * **Meat:** Organ meats (especially liver and kidney) are the richest sources of Vitamin B12. * **Fish:** Seafood, particularly shellfish and fatty fish, contains high levels of B12. **High-Yield NEET-PG Pearls:** * **Absorption:** Requires **Intrinsic Factor (IF)** secreted by gastric parietal cells; absorption occurs in the **terminal ileum**. * **Storage:** Unlike other water-soluble vitamins, B12 is stored in the **liver** for 3–5 years. * **Deficiency:** Leads to **Megaloblastic Anemia** and neurological complications like **Subacute Combined Degeneration of the Spinal Cord (SCD)**. * **Schilling Test:** Historically used to determine the cause of B12 malabsorption (e.g., Pernicious anemia). * **Vegetarian Source Myth:** Spirulina and certain algae contain "pseudo-B12," which is biologically inactive in humans.

Q: What is the best method to measure goitre prevalence rate in a community?

Neonatal hypothyroidism screening. **Explanation:** The assessment of Iodine Deficiency Disorders (IDD) in a community relies on specific indicators of severity. **Neonatal hypothyroidism screening** (measuring TSH levels in newborns) is considered the most sensitive and "best" indicator for monitoring the impact of iodine deficiency in a population. **Why Option A is correct:** Newborns are highly sensitive to iodine deficiency. Even mild deficiency during pregnancy can lead to elevated TSH levels in the neonate. A prevalence of neonatal TSH >5 mU/L in more than 3% of births indicates a public health problem. This method provides a real-time assessment of the current iodine status of the community, unlike physical goitre surveys which reflect past or chronic deficiency. **Why other options are incorrect:** * **B. Iodine level in salt:** This is a process indicator (monitoring the intervention), not a biological impact indicator. It measures the availability of iodized salt but not the actual physiological status of the population. * **C & D. Adult hypothyroidism/Thyroid function tests:** While useful for clinical diagnosis, these are not cost-effective or sensitive enough for community-wide prevalence screening. Adult thyroid status is influenced by many non-iodine-related factors (e.g., autoimmunity). **High-Yield Facts for NEET-PG:** * **Total Goitre Rate (TGR):** If TGR is >5% in primary school children (6–12 years), the area is declared endemic for goitre. * **Urinary Iodine Excretion (UIE):** The best indicator for **current** iodine intake. A median UIE <100 µg/L indicates deficiency. * **Best indicator for impact of Iodization:** Neonatal TSH levels. * **Iodine content in salt:** 30 ppm at production level; 15 ppm at consumer level.

Q: What is the daily requirement of Vitamin A for an adult man?

600 mcg. **Explanation:** The daily requirement of Vitamin A is based on the recommendations provided by the **ICMR-NIN (National Institute of Nutrition)**. For an adult man, the Recommended Dietary Allowance (RDA) is **600 mcg of Retinol** per day. Vitamin A is a fat-soluble vitamin essential for maintaining normal vision (rhodopsin synthesis), epithelial integrity, and immune function. In the body, it is measured in terms of Retinol or Beta-carotene (where 1 mcg of Retinol = 8 mcg of Beta-carotene, as per revised ICMR guidelines). **Analysis of Options:** * **600 mcg (Correct):** This is the standard RDA for both adult men and non-pregnant, non-lactating adult women. * **350 mcg (Incorrect):** This value is significantly below the adult requirement and does not correspond to any standard adult RDA category. * **100 mcg (Incorrect):** This is too low for an adult and is insufficient even for infants (whose requirement is approximately 350 mcg). * **2000 mcg (Incorrect):** This exceeds the daily requirement. While the liver stores Vitamin A, chronic intake at this level without deficiency could lead to hypervitaminosis A. **High-Yield Clinical Pearls for NEET-PG:** 1. **Lactation:** The requirement increases significantly to **950 mcg/day** to compensate for Vitamin A secreted in breast milk. 2. **Vitamin A Prophylaxis Program:** Children (6–11 months) receive 1 lakh IU, and children (1–5 years) receive 2 lakh IU every 6 months. 3. **First Sign:** Conjunctival xerosis is the first *objective* sign, while Night Blindness (Nyctalopia) is the earliest *symptom*. 4. **Bitot’s Spots:** These are triangular, pearly-white foamy deposits on the bulbar conjunctiva, pathognomonic for Vitamin A deficiency.

Q: What is the approximate amount of lactose in grams per 100 grams of human breast milk?

7.5. ### Explanation The correct answer is **7.5 g/100 ml** (Option D). **1. Why Option D is Correct:** Human breast milk is uniquely designed to support the rapid brain development of human infants. It contains a significantly higher concentration of **lactose** (the primary carbohydrate) compared to animal milk. On average, human milk contains **7.0 to 7.5 grams of lactose per 100 ml**. This high lactose content provides a steady source of glucose for the brain and promotes the growth of *Lactobacillus bifidus* in the gut, which maintains an acidic environment to inhibit pathogens. **2. Why the Other Options are Incorrect:** * **Options A (3.4) and B (4.4):** These values are more characteristic of **Cow’s Milk**, which contains approximately **4.4 to 4.8 g/100 ml** of lactose. Cow’s milk is higher in protein (3.2g) but lower in carbohydrates compared to human milk. * **Option C (5.1):** This is an intermediate value that does not represent the standard physiological composition of mature human breast milk. **3. High-Yield Clinical Pearls for NEET-PG:** To differentiate between Human Milk and Cow's Milk (per 100 ml), remember the **"Rule of 7-1-3"** for Human Milk: * **Carbohydrates (Lactose):** ~7.0 g (Cow's milk: ~4.5 g) * **Proteins:** ~1.1 g (Cow's milk: ~3.2 g — *Cow's milk has 3x more protein, mainly casein*) * **Fats:** ~3.4 g (Cow's milk: ~3.4 g — *Total fat is similar, but human milk has more PUFAs/DHA*) * **Energy:** Both provide approximately **65–67 kcal/100 ml**. * **Minerals:** Human milk has a lower solute load (Calcium/Phosphorus), making it easier on neonatal kidneys.

Question 1

What is the estimated daily caloric requirement for an adult male worker with moderate activity levels?

Accepted Answer

2730 Kcal/day

Answer

2320 Kcal/day

Answer

2230 Kcal/day

Answer

3490 Kcal/day

Question 2

Which vitamin is absent in eggs?

Accepted Answer

Vitamin C

Answer

Vitamin B1

Answer

Vitamin B6

Answer

Vitamin E

Question 3

Among the pulses, which one contains the highest quantity of protein?

Accepted Answer

Soyabean

Answer

Green gram

Answer

Red gram

Answer

Black gram

Question 4

James Lind is known for what contribution?

Accepted Answer

Prevention of scurvy by fruits

Answer

Germ theory of disease

Answer

Multifactorial causation of disease

Answer

None of the above

Question 5

One mg of Niacin is produced by how many mg of Tryptophan?

Accepted Answer

60

Answer

22

Answer

37

Answer

55

Question 6

Vitamin B12 is not found in which of the following?

Accepted Answer

Soyabean

Answer

Milk

Answer

Meat

Answer

Fish

Question 7

What is the best method to measure goitre prevalence rate in a community?

Accepted Answer

Neonatal hypothyroidism screening

Answer

Iodine level in salt

Answer

Adult hypothyroidism screening

Answer

Thyroid function test screening

Question 8

What is the daily requirement of Vitamin A for an adult man?

Accepted Answer

600 mcg

Answer

350 mcg

Answer

100 mcg

Answer

2000 mcg

Question 9

What is the approximate amount of lactose in grams per 100 grams of human breast milk?

Accepted Answer

7.5

Answer

3.4

Answer

4.4

Answer

5.1

Question 10

Which of the following tests is NOT used to assess the effectiveness of pasteurization?

Accepted Answer

Methylene blue test

Answer

Phosphatase test

Answer

Coliform count

Answer

Standard plate count

Nutrition and Health — MCQs

Nutrition and Health — MCQs

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