Nutrition and Health — MCQs

Nutrition and Health Indian Medical PG Practice Questions and MCQs

Question 361: Compared with cow's milk, mother's milk has more-

A. Lactose (Correct Answer)
B. Vitamin D
C. Proteins
D. Fat

Explanation: **Explanation:** The composition of human milk is uniquely designed to meet the developmental needs of a human infant. **1. Why Lactose is the Correct Answer:** Human milk contains significantly more **Lactose** (approx. 7.0 g/dL) compared to cow’s milk (approx. 4.5 g/dL). Lactose is a disaccharide that provides essential energy for the rapidly developing infant brain. Furthermore, it is fermented in the gut to produce lactic acid, which promotes the growth of *Lactobacillus bifidus* and enhances the absorption of calcium. **2. Why the Other Options are Incorrect:** * **Proteins:** Cow’s milk contains about **three times more protein** (3.5 g/dL) than human milk (1.1 g/dL). However, human milk has a higher proportion of **Whey** (60:40 ratio), which is easier to digest, whereas cow’s milk is dominant in **Casein** (20:80 ratio), which forms hard curds. * **Vitamin D:** Both human and cow’s milk are **notoriously low** in Vitamin D. Infants require sunlight exposure or supplementation regardless of the milk source. * **Fat:** The total fat content is roughly similar in both (approx. 3.5–4.0 g/dL). However, human milk is richer in **Polyunsaturated Fatty Acids (PUFAs)** and contains **Lipase**, which aids in fat digestion—a feature absent in cow’s milk. **Clinical Pearls for NEET-PG:** * **Minerals:** Cow’s milk has much higher concentrations of Calcium, Phosphorus, Sodium, and Potassium, which can lead to a high **Renal Solute Load** in infants. * **Iron:** Both are poor sources of iron, but the **bioavailability** of iron in breast milk is much higher (50-70%) compared to cow's milk (10%). * **Protective Factors:** Breast milk contains IgA, Lysozyme, and Lactoferrin, providing passive immunity that cow's milk lacks.

Question 362: Burning foot syndrome was described by whom?

A. Gopalan (Correct Answer)
B. Ramalingaswamy
C. Pauling
D. Limann

Explanation: **Explanation:** **Burning Foot Syndrome (Gopalan’s Syndrome)** is a clinical condition characterized by severe burning sensations, tingling, and numbness in the feet, often accompanied by excessive sweating and elevated skin temperature. 1. **Why Gopalan is correct:** The syndrome was first described by the renowned Indian nutritionist **Dr. C. Gopalan** in 1946. He observed this condition in prisoners of war and malnourished individuals. It is primarily attributed to a deficiency of **Pantothenic acid (Vitamin B5)**, which is essential for the synthesis of coenzyme A and fatty acid metabolism. 2. **Why other options are incorrect:** * **Ramalingaswamy:** Dr. V. Ramalingaswamy was a pioneer in Indian medical research known for his work on protein-energy malnutrition (PEM) and nutritional blindness, but he did not describe Burning Foot Syndrome. * **Pauling:** Linus Pauling is famous for his work on Vitamin C (orthomolecular medicine) and sickle cell anemia; he is not associated with Vitamin B5 research. * **Limann:** There is no significant historical association between a researcher named Limann and nutritional deficiency syndromes in standard medical literature. **High-Yield Clinical Pearls for NEET-PG:** * **Vitamin B5 (Pantothenic Acid):** Known as the "chick anti-dermatitis factor." * **Clinical Presentation:** Distal dysesthesia (burning), sleep disturbances, and fatigue. * **Differential Diagnosis:** Must be distinguished from diabetic neuropathy and alcoholic neuropathy. * **Key Association:** Always link **Gopalan → Burning Foot → Vitamin B5**.

Question 363: What is the optimum percentage of calories that should be provided by proteins?

A. 5-10%
B. 10-15% (Correct Answer)
C. 15-20%
D. 20-30%

Explanation: In balanced nutrition, the distribution of macronutrients is essential for maintaining physiological functions and preventing chronic diseases. For a healthy adult, the **Acceptable Macronutrient Distribution Range (AMDR)** for proteins is typically set between **10% and 15%** of the total daily caloric intake. ### Why 10-15% is Correct: This range ensures an adequate supply of essential amino acids for tissue repair, enzyme production, and immune function without placing an excessive metabolic load on the kidneys. In the Indian context (ICMR-NIN guidelines), the recommended dietary allowance (RDA) for protein is approximately **0.8 to 1.0 g/kg body weight/day**, which aligns with this percentage of total energy. ### Explanation of Incorrect Options: * **A (5-10%):** This is insufficient for most adults. Intakes below 10% may lead to protein-energy malnutrition (PEM), muscle wasting, and impaired immunity. * **C (15-20%):** While common in "high-protein" diets or for athletes, this is above the standard population recommendation for a balanced diet. * **D (20-30%):** This range is typically reserved for therapeutic diets (e.g., burn recovery) or specific bodybuilding regimens. Long-term intake at this level may increase the risk of renal calculi or accelerate underlying kidney disease. ### High-Yield Facts for NEET-PG: * **Energy Values (Atwater Factors):** Protein = 4 kcal/g; Carbohydrates = 4 kcal/g; Fat = 9 kcal/g. * **Balanced Diet Ratios:** * **Carbohydrates:** 50–70% (Major source) * **Proteins:** 10–15% * **Fats:** 20–30% * **Net Protein Utilization (NPU):** Egg protein is considered the "Reference Protein" with an NPU of 100. * **Limiting Amino Acids:** Pulses are deficient in Methionine; Cereals are deficient in Lysine. (Mixing them provides a "complete" protein profile).

Question 364: The Nitric acid test is used for the detection of which substance?

A. Lathyrism
B. Argemone oil (Correct Answer)
C. Aflatoxin
D. BOAA

Explanation: ### Explanation **Correct Answer: B. Argemone oil** **Medical Concept:** The **Nitric Acid Test** is the standard chemical test used to detect the presence of **Argemone oil** (an adulterant) in mustard oil. When concentrated nitric acid is added to a sample containing argemone oil, a **rich orange-red to crimson color** develops in the acid layer. This reaction occurs due to the presence of the alkaloid **Sanguinarine**, which is the toxic principle in argemone seeds. **Analysis of Incorrect Options:** * **A. Lathyrism:** This is a neurological condition caused by the consumption of *Lathyrus sativus* (Khesari dal). It is detected by the **HCl Test** (which turns the sample pink) or by identifying the presence of the neurotoxin **BOAA**. * **C. Aflatoxin:** These are hepatotoxic mycotoxins produced by *Aspergillus flavus*, commonly found in stored groundnuts and grains. Detection is typically done via **Ultraviolet (UV) light fluorescence** (showing a blue or green glow) or Chromatography (HPLC/TLC). * **D. BOAA (Beta-Oxalyl-Amino-Alanine):** This is the specific neurotoxin found in Khesari dal responsible for Neurolathyrism. It is not detected by nitric acid. **High-Yield Clinical Pearls for NEET-PG:** 1. **Epidemic Dropsy:** Consumption of mustard oil adulterated with Argemone oil leads to Epidemic Dropsy. Clinical features include bilateral pitting edema of legs, diarrhea, dyspnea, and **Glaucoma** (due to increased capillary permeability). 2. **Sanguinarine:** The toxin inhibits the oxidation of pyruvic acid, leading to its accumulation in the blood. 3. **Paper Chromatography:** This is a more sensitive test than the Nitric Acid test for detecting Argemone oil at very low concentrations (up to 0.0001%).

Question 365: Pasteurization of milk is achieved by boiling at what temperature and duration?

A. 65°C for 30 minutes (Correct Answer)
B. 72°C for 10 seconds
C. 100°C for 20 seconds
D. 136°C for 30 seconds

Explanation: **Explanation:** Pasteurization is a protective heat-treatment process designed to kill pathogenic bacteria (especially *Mycobacterium tuberculosis* and *Coxiella burnetii*) and reduce spoilage organisms without significantly altering the nutritional value or flavor of milk. **Why Option A is Correct:** Option A refers to the **Holder Method (Low-Temperature Long-Time - LTLT)**. In this method, milk is heated to **63.5°C to 65.6°C (standardized as 65°C)** and maintained at that temperature for **30 minutes**, followed by rapid cooling to below 5°C. This duration ensures the destruction of the most heat-resistant non-spore-forming pathogens. **Analysis of Incorrect Options:** * **Option B:** This is a distractor for the **Flash Method (High-Temperature Short-Time - HTST)**. The correct parameters for HTST are **72°C for 15 seconds** (not 10 seconds). * **Option C:** Heating milk to 100°C is considered boiling or sterilization, which alters the protein structure and taste, exceeding the requirements for pasteurization. * **Option D:** This resembles **Ultra-High Temperature (UHT)** processing, which typically requires **125°C to 150°C for 1 to 3 seconds**. **High-Yield NEET-PG Pearls:** 1. **Phosphatase Test:** This is the standard test to check the efficiency of pasteurization. Since the enzyme alkaline phosphatase is naturally present in raw milk and is destroyed at temperatures slightly higher than those required to kill pathogens, its absence indicates successful pasteurization. 2. **Standard for Pasteurization:** *Coxiella burnetii* (the causative agent of Q fever) is the most heat-resistant pathogen found in milk; therefore, pasteurization parameters are specifically set to ensure its destruction. 3. **Storage:** After pasteurization, milk must be quickly cooled to **5°C or less** to prevent the growth of any surviving thermoduric bacteria.

Question 366: What are the doses of Vitamin A (I.U.) and Vitamin D (I.U.) in Dalda?

A. 1000 & 100
B. 1500 & 125
C. 2000 & 150
D. 2500 & 175 (Correct Answer)

Explanation: **Explanation:** In India, **Dalda** (Hydrogenated Vegetable Oil/Vanaspati) is legally required to be fortified with Vitamin A and Vitamin D under the **Prevention of Food Adulteration (PFA) Act**. This fortification is a public health strategy to combat widespread micronutrient deficiencies. **1. Why Option D is Correct:** According to the statutory standards, Vanaspati must be fortified with: * **Vitamin A:** 25 International Units (I.U.) per gram. * **Vitamin D:** 2 International Units (I.U.) per gram (optional, but standard practice is to include it). When calculated per **100 grams**, this equates to **2500 I.U. of Vitamin A** and **approximately 175–200 I.U. of Vitamin D**. Option D (2500 & 175) aligns precisely with these mandatory fortification levels. **2. Why Other Options are Incorrect:** * **Options A, B, and C:** These values (1000, 1500, 2000 I.U.) fall below the legally mandated levels for Vitamin A fortification in Vanaspati. Providing lower doses would fail to meet the nutritional goals set by the government to prevent conditions like Xerophthalmia. **3. High-Yield Facts for NEET-PG:** * **Purpose of Fortification:** Vanaspati is fortified to make it nutritionally equivalent to Ghee (clarified butter). * **Vitamin A Source:** Usually added as Vitamin A palmitate or acetate. * **Baudouin Test:** This is a mandatory test for Vanaspati to detect the presence of **Sesame Oil** (5% addition is compulsory). It helps identify the adulteration of pure Ghee with Vanaspati. * **Public Health Impact:** Fortification of staple foods (like oil, milk, and salt) is considered one of the most cost-effective "Best Buys" in community medicine to tackle "Hidden Hunger."

Question 367: 'Burning Sole Syndrome' is seen in deficiency of?

A. Riboflavin
B. Pyridoxine
C. Pantothenic acid (Correct Answer)
D. Vitamin B12

Explanation: **Explanation:** The correct answer is **Pantothenic acid (Vitamin B5)**. **1. Why Pantothenic Acid is Correct:** Burning Sole Syndrome (also known as Grierson-Gopalan Syndrome) is the classic clinical manifestation of Pantothenic acid deficiency. Pantothenic acid is a structural component of **Coenzyme A (CoA)**, which is vital for the metabolism of carbohydrates, fatty acids, and amino acids. Deficiency leads to distal paresthesia, characterized by a severe burning sensation in the feet, hyperesthesia, and vasomotor instability. Historically, this was famously documented in prisoners of war during World War II. **2. Why Other Options are Incorrect:** * **Riboflavin (B2):** Deficiency typically presents with **Ariboflavinosis**, characterized by angular stomatitis, cheilosis, glossitis (magenta tongue), and corneal vascularization. * **Pyridoxine (B6):** Deficiency primarily causes peripheral neuropathy (often isoniazid-induced), microcytic anemia, and seizures (due to decreased GABA synthesis). While it causes neuropathy, it is not specifically associated with the "Burning Sole" eponym. * **Vitamin B12 (Cobalamin):** Deficiency leads to **Subacute Combined Degeneration (SCD)** of the spinal cord and Megaloblastic anemia. While it causes tingling and numbness, the specific clinical syndrome of "Burning Soles" is unique to B5. **3. High-Yield Clinical Pearls for NEET-PG:** * **Vitamin B5 (Pantothenic acid):** Derived from the Greek word *pantothen* (meaning "from everywhere"), reflecting its wide distribution in foods. Isolated deficiency is rare. * **Gopalan’s Syndrome:** Another name for Burning Feet Syndrome, named after the Indian nutritionist C. Gopalan. * **Key Association:** Always link **Coenzyme A** and **Acyl Carrier Protein (ACP)** with Vitamin B5.

Question 368: Why is egg considered an ideal protein source?

A. High cholesterol content
B. High protein content per 100 grams
C. High biological value and Net Protein Utilization (NPU) (Correct Answer)
D. Absence of a limiting amino acid

Explanation: **Explanation:** The egg is considered the "Gold Standard" or the reference protein in human nutrition because its amino acid profile most closely matches the requirements of the human body. **1. Why Option C is Correct:** The quality of a protein is determined by its **Biological Value (BV)** and **Net Protein Utilization (NPU)**. * **Biological Value:** This measures the proportion of absorbed nitrogen that is retained by the body. The BV of an egg is **94**, the highest among naturally occurring foods. * **Net Protein Utilization (NPU):** This measures the proportion of nitrogen intake that is actually retained (taking digestibility into account). The NPU of an egg is **96**. Because these values are near-perfect, the egg is used as a benchmark (Score = 100) to compare the quality of all other dietary proteins. **2. Why Other Options are Incorrect:** * **Option A:** High cholesterol is a lipid characteristic and does not define the quality of a protein. * **Option B:** While eggs have good protein content (approx. 13g/100g), foods like soy (40g/100g) or pulses have higher absolute quantities. "Ideal" refers to **quality**, not just quantity. * **Option D:** While eggs contain all essential amino acids, the term "ideal" specifically relates to the efficiency of utilization (BV/NPU) rather than just the absence of a limiting amino acid. **High-Yield Clinical Pearls for NEET-PG:** * **Reference Protein:** Egg protein is the reference protein against which others are compared. * **Limiting Amino Acids:** Pulses are deficient in **Methionine**, while Cereals are deficient in **Lysine**. Egg has no such deficiency. * **Protein Efficiency Ratio (PER):** For eggs, it is approximately 4.5. * **Daily Requirement:** The safe intake of protein for an average Indian adult is **0.83 g/kg body weight/day** (as per ICMR-NIN 2020 guidelines).

Question 369: Which of the following trace elements cannot be completely supplemented by diet in pregnancy?

A. Iron (Fe) (Correct Answer)
B. Calcium (Ca++)
C. Zinc (Zn)
D. Manganese

Explanation: **Explanation:** **Why Iron (Fe) is the Correct Answer:** During pregnancy, the physiological requirement for iron increases significantly to support the expansion of maternal red cell mass, the development of the placenta, and the growth of the fetus. The total iron requirement during a singleton pregnancy is approximately **1000 mg**. Even with a balanced, iron-rich diet, the bioavailability of dietary iron (especially non-heme iron from plant sources common in the Indian diet) is insufficient to meet these escalated demands. The daily absorption required exceeds what the gut can physiologically process from food alone. Therefore, the **National Iron Plus Initiative (NIPI)** and WHO mandate oral supplementation (100 mg elemental iron daily for 180 days) to prevent Iron Deficiency Anemia (IDA). **Analysis of Incorrect Options:** * **B. Calcium (Ca++):** While calcium requirements increase (to ~1200 mg/day), they can generally be met through a diet rich in dairy products, ragi, and green leafy vegetables. Supplementation is often given to prevent pre-eclampsia, but it is theoretically possible to meet needs via diet. * **C. Zinc (Zn):** Zinc is widely available in pulses, nuts, and animal products. Deficiency is rare in pregnant women consuming a diverse diet. * **D. Manganese:** This is a micro-trace element required in very minute quantities; dietary intake is almost always sufficient. **High-Yield Clinical Pearls for NEET-PG:** * **Iron Stores:** A woman must have at least 500 mg of iron stores to navigate pregnancy without supplements; most women in developing countries start pregnancy with near-zero stores. * **IFA Tablet Composition (Programmatic):** 100 mg Elemental Iron + 500 mcg Folic Acid. * **Prophylaxis:** Started from the 2nd trimester (after 12 weeks) to avoid aggravating first-trimester nausea. * **Most Common Nutrient Deficiency:** Iron deficiency remains the most common nutritional deficiency during pregnancy worldwide.

Question 370: Iron absorption from the intestine is regulated by which of the following mechanisms?

A. Acid secretion in the stomach
B. Reducing substances in food
C. The mucosal block in intestinal cells according to iron requirement (Correct Answer)
D. An alkaline medium in the small intestine

Explanation: ### Explanation **1. Why the Correct Answer is Right:** The primary regulator of iron balance in the body is the **"Mucosal Block"** mechanism. Unlike other minerals, the body has no physiological pathway for active iron excretion. Therefore, homeostasis is maintained strictly at the point of absorption in the proximal small intestine (duodenum). When iron stores are adequate, the liver produces **Hepcidin**, which binds to and degrades ferroportin (the export channel on enterocytes). This "blocks" the transfer of iron from the intestinal cells into the bloodstream. The trapped iron is eventually lost when the mucosal cells are desquamated. Conversely, in iron deficiency, hepcidin levels fall, allowing for increased absorption. This ensures the body only takes in what it requires. **2. Why the Other Options are Incorrect:** * **Options A & B:** Gastric acid (HCl) and reducing substances (like Vitamin C/Ascorbic acid) are **facilitators** of absorption. They help convert ferric iron ($Fe^{3+}$) to the more soluble ferrous form ($Fe^{2+}$). While they influence the *efficiency* of absorption, they do not *regulate* the body's overall iron balance based on systemic requirements. * **Option D:** An alkaline medium actually **inhibits** iron absorption by promoting the formation of insoluble iron complexes. Iron is best absorbed in an acidic environment. **3. NEET-PG High-Yield Pearls:** * **Hepcidin:** The "Master Regulator" of iron metabolism. It is an acute-phase reactant (increased in chronic inflammation, leading to Anemia of Chronic Disease). * **Enhancers of Absorption:** Vitamin C, Citrate, Amino acids, and "Meat factor." * **Inhibitors of Absorption:** Phytates (cereals), Oxalates (green leafy vegetables), Phosphates, Tannins (tea), and Calcium. * **Storage:** Iron is stored as **Ferritin** (labile) and **Hemosiderin** (stable). Ferritin is the most sensitive index for iron deficiency.

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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