Nutrition and Health — MCQs

Nutrition and Health Indian Medical PG Practice Questions and MCQs

Question 41: What is the estimated daily caloric requirement for an adult male worker with moderate activity levels?

A. 2320 Kcal/day
B. 2230 Kcal/day
C. 2730 Kcal/day (Correct Answer)
D. 3490 Kcal/day

Explanation: 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.

Question 42: Which vitamin is absent in eggs?

A. Vitamin B1
B. Vitamin B6
C. Vitamin C (Correct Answer)
D. Vitamin E

Explanation: **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.

Question 43: Among the pulses, which one contains the highest quantity of protein?

A. Green gram
B. Red gram
C. Soyabean (Correct Answer)
D. Black gram

Explanation: **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).

Question 44: James Lind is known for what contribution?

A. Germ theory of disease
B. Multifactorial causation of disease
C. Prevention of scurvy by fruits (Correct Answer)
D. None of the above

Explanation: **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.

Question 45: One mg of Niacin is produced by how many mg of Tryptophan?

A. 22
B. 37
C. 55
D. 60 (Correct Answer)

Explanation: **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).

Question 46: Vitamin B12 is not found in which of the following?

A. Soyabean (Correct Answer)
B. Milk
C. Meat
D. Fish

Explanation: **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.

Question 47: What is the best method to measure goitre prevalence rate in a community?

A. Neonatal hypothyroidism screening (Correct Answer)
B. Iodine level in salt
C. Adult hypothyroidism screening
D. Thyroid function test screening

Explanation: **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.

Question 48: What is the daily requirement of Vitamin A for an adult man?

A. 350 mcg
B. 100 mcg
C. 600 mcg (Correct Answer)
D. 2000 mcg

Explanation: **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.

Question 49: What is the approximate amount of lactose in grams per 100 grams of human breast milk?

A. 3.4
B. 4.4
C. 5.1
D. 7.5 (Correct Answer)

Explanation: ### 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 50: Which of the following tests is NOT used to assess the effectiveness of pasteurization?

A. Phosphatase test
B. Methylene blue test (Correct Answer)
C. Coliform count
D. Standard plate count

Explanation: **Explanation:** The primary goal of pasteurization is to destroy pathogenic organisms (like *Mycobacterium tuberculosis* and *Coxiella burnetii*) and reduce spoilage bacteria without altering the milk's nutritional value. **Why Methylene Blue Reduction Test (MBRT) is the correct answer:** The MBRT is used to assess the **bacteriological quality of raw milk** before it is processed. It measures the metabolic activity of bacteria; the faster the blue color disappears, the higher the bacterial load. It is **not** a test for pasteurization efficiency because the process of heating significantly alters the microbial flora, making this test unreliable for post-pasteurization assessment. **Analysis of Incorrect Options:** * **Phosphatase Test:** This is the **standard/confirmatory test** for pasteurization. The enzyme alkaline phosphatase is naturally present in raw milk and is destroyed at temperatures slightly higher than those required to kill the most heat-resistant pathogens. If the test is positive, it indicates inadequate heating or contamination with raw milk. * **Standard Plate Count (SPC):** This measures the total number of viable aerobic bacteria in the milk. Post-pasteurization, the SPC must be within legal limits (e.g., <30,000/ml for Grade A) to ensure the process was effective. * **Coliform Count:** Coliforms are usually destroyed by pasteurization. Their presence in pasteurized milk indicates **post-pasteurization contamination** (re-contamination), reflecting poor hygiene in the plant. **High-Yield Clinical Pearls for NEET-PG:** * **Confirmatory Test for Pasteurization:** Phosphatase Test. * **Most Heat-Resistant Pathogen in Milk:** *Coxiella burnetii* (Q fever). Pasteurization standards are specifically designed to kill this organism. * **Holder Method:** 63°C (145°F) for 30 minutes. * **HTST (High Temperature Short Time) Method:** 72°C (161°F) for 15 seconds. * **Milk-borne diseases:** Include Bovine TB, Brucellosis, Q fever, and Salmonellosis.

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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