Nutrition and Health — MCQs

Nutrition and Health Indian Medical PG Practice Questions and MCQs

Question 201: Which of the following statements about the pasteurization of milk is FALSE?

A. It does not kill thermoduric bacteria.
B. It does not kill spores.
C. It causes a greater than 95% decrease in bacterial count. (Correct Answer)
D. It kills the tubercle bacillus.

Explanation: **Explanation** Pasteurization is a heat-treatment process designed to make milk safe for human consumption by eliminating pathogenic microorganisms while minimizing chemical and physical changes. **Why Option C is the Correct (False) Statement:** The primary goal of pasteurization is the destruction of all pathogenic organisms. Regarding the total bacterial load, standard pasteurization (such as the Holder method or HTST) is expected to achieve a **99% to 99.9% reduction** in the bacterial count, not just 95%. A 95% reduction would be considered inadequate by public health standards. **Analysis of Other Options:** * **Option A (True):** Thermoduric bacteria (e.g., *Micrococcus*, *Bacillus*) can survive the heat of pasteurization. While they do not cause disease, they can contribute to milk spoilage. * **Option B (True):** Pasteurization is not sterilization. It is ineffective against bacterial spores (e.g., *Clostridium*, *Anthrax*), which require higher temperatures (autoclaving) to be destroyed. * **Option C (True):** *Mycobacterium tuberculosis* is the index organism for pasteurization because it is the most heat-resistant non-spore-forming pathogen. If the process kills the tubercle bacillus, it is assumed all other common pathogens (like *Salmonella* and *Brucella*) are also destroyed. **High-Yield NEET-PG Pearls:** 1. **Methods:** * **Holder Method:** 63–66°C for 30 minutes. * **HTST (High-Temperature Short-Time):** 72°C for 15 seconds (followed by rapid cooling to 4°C). 2. **Phosphatase Test:** This is the gold standard test to check the efficacy of pasteurization. If the enzyme phosphatase is absent, pasteurization was successful. 3. **Coxiella burnetii:** This is now considered the most heat-resistant pathogen in milk (causing Q fever); modern pasteurization standards are specifically calibrated to ensure its destruction.

Question 202: Which of the following is considered the poor man's source of iron?

A. Almond
B. Grapes
C. Soya
D. Jaggery (Correct Answer)

Explanation: **Explanation:** **Jaggery (Gur)** is historically and clinically referred to as the "poor man’s source of iron" in the context of Indian public health. Unlike refined white sugar, jaggery is produced by boiling sugarcane juice in large **iron vessels**. During this process, a significant amount of iron leaches from the vessels into the jaggery. It contains approximately **10–11 mg of iron per 100g**, making it a cost-effective and culturally acceptable dietary intervention for preventing nutritional anemia in low-socioeconomic populations. **Analysis of Incorrect Options:** * **Almond:** While nutrient-dense and containing iron, almonds are expensive and considered a "rich man’s food," making them inaccessible as a mass-scale nutritional source for the poor. * **Grapes:** These are a source of Vitamin C and antioxidants but contain negligible amounts of iron. * **Soya:** Soybeans are the "poor man’s meat" because they are the richest plant source of protein (40%). While they contain some iron, their primary clinical association in NEET-PG is with protein-energy malnutrition (PEM). **High-Yield Clinical Pearls for NEET-PG:** * **Poor man’s meat:** Pulses/Soya (due to high protein content). * **Poor man’s milk:** Groundnut milk or Soya milk. * **Iron Absorption:** Non-heme iron (found in jaggery) absorption is enhanced by Vitamin C (Ascorbic acid) and inhibited by phytates, oxalates, and tannins (tea/coffee). * **National Iron Plus Initiative (NIPI):** Under this program, the prophylactic dose for adults is 100mg elemental iron and 500mcg folic acid (IFA tablet) weekly/daily depending on the target group.

Question 203: What is an important point for a prudent diet?

A. Unsaturated fats should be less than 10%
B. Dietary fat should be limited to 20-30% of total intake (Correct Answer)
C. Avoidance of complex carbohydrates
D. Proteins should account for 50-60% of diet

Explanation: ### Explanation A **Prudent Diet** refers to a balanced dietary pattern designed to reduce the risk of non-communicable diseases (NCDs) like obesity, hypertension, and cardiovascular diseases. **1. Why Option B is Correct:** According to WHO and nutritional guidelines for a prudent diet, total dietary fat should be restricted to **20–30% of the total energy intake**. This range ensures sufficient intake of essential fatty acids while preventing excessive caloric density that leads to metabolic syndrome. **2. Analysis of Incorrect Options:** * **Option A:** In a prudent diet, it is **Saturated Fats** that should be limited to less than 10% of total energy intake. Unsaturated fats (MUFAs and PUFAs) are actually encouraged as substitutes for saturated fats to improve lipid profiles. * **Option C:** A prudent diet emphasizes the **increase** of complex carbohydrates (like whole grains, legumes, and fiber) and the **avoidance of refined/simple sugars** (which should be <10% of total energy). * **Option D:** Proteins should typically account for **10–15%** of the total daily energy intake. A diet where proteins account for 50–60% is physiologically unsustainable and potentially harmful to renal function. **3. High-Yield Clinical Pearls for NEET-PG:** * **Salt Intake:** Should be limited to less than **5g per day** to prevent hypertension. * **Dietary Fiber:** Recommended intake is **~40g/2000 kcal**. * **Cholesterol:** Dietary cholesterol should be restricted to below **300 mg/day**. * **PUFA/SFA Ratio:** The ideal ratio in a balanced diet should be between **0.8 and 1.0**. * **Free Sugars:** Should ideally be less than **5%** of total energy for additional health benefits.

Question 204: Which of the following is considered a primary source of iron for economically disadvantaged populations?

A. Soybeans
B. Oranges
C. Jaggery (Correct Answer)
D. Almonds

Explanation: **Explanation:** **Why Jaggery is the Correct Answer:** In the context of public health and community medicine, Jaggery (unrefined sugar) is a vital source of non-heme iron for economically disadvantaged populations. It contains approximately **11 mg of iron per 100g**. Its significance lies in its **affordability, cultural acceptance, and accessibility** compared to expensive animal-based heme iron sources. In India, it is frequently recommended in nutritional programs to combat Iron Deficiency Anemia (IDA) among pregnant women and children in rural settings. **Analysis of Incorrect Options:** * **Soybeans:** While soybeans are rich in protein and contain iron, they also contain high levels of **phytates**, which significantly inhibit iron absorption. They are not the primary "go-to" source for iron supplementation in low-SES groups compared to jaggery. * **Oranges:** Oranges are a source of Vitamin C (Ascorbic acid). While they do not provide iron themselves, they are crucial for **enhancing the absorption** of non-heme iron when consumed with meals. * **Almonds:** Almonds are nutrient-dense but are **prohibitively expensive** for economically disadvantaged populations, making them an impractical primary source for public health interventions. **High-Yield NEET-PG Pearls:** * **Enhancers of Iron Absorption:** Vitamin C (Ascorbic acid), meat protein, and gastric acid. * **Inhibitors of Iron Absorption:** Phytates (cereals), Oxalates (spinach), Tannins (tea), Calcium, and Phosphates. * **National Iron Plus Initiative (NIPI):** Remember the dosage for "WIFS" (Weekly Iron Folic Acid Supplementation)—100 mg elemental iron and 500 µg folic acid for adolescents. * **Best Source:** While liver is the richest source of iron, Jaggery is the most "cost-effective" source for the masses.

Question 205: A person who subsisted on taking maize only for many years reported to a health facility with the signs of glossitis. His history suggested frequent attacks of diarrhea and memory loss. What is the likely condition?

A. Iron deficiency
B. Riboflavin deficiency
C. Beri Beri
D. Pellagra (Correct Answer)

Explanation: ### Explanation The correct answer is **D. Pellagra**. **1. Why Pellagra is the correct answer:** Pellagra is caused by a deficiency of **Niacin (Vitamin B3)**. The clinical presentation is classically described by the **"4 Ds"**: **D**ermatitis (often including glossitis/stomatitis), **D**iarrhea, **D**ementia (memory loss/confusion), and if untreated, **D**eath. The key epidemiological link here is the **maize-only diet**. Maize contains niacin in a bound form (niacytin) that is not absorbable. Furthermore, maize is deficient in **Tryptophan**, an essential amino acid that serves as a precursor for the endogenous synthesis of niacin in the body (60 mg of Tryptophan = 1 mg of Niacin). **2. Why other options are incorrect:** * **Iron deficiency:** Primarily presents with microcytic hypochromic anemia, pica, and koilonychia (spoon-shaped nails). While it can cause glossitis, it does not explain the diarrhea or memory loss. * **Riboflavin (B2) deficiency:** Characterized by the "oral-ocular-genital" syndrome, including angular stomatitis, cheilosis, and corneal vascularization, but lacks the systemic triad of diarrhea and dementia. * **Beri Beri:** Caused by Thiamine (B1) deficiency. It presents as "Dry Beri Beri" (polyneuritis/muscle wasting) or "Wet Beri Beri" (high-output heart failure/edema), not the classic gastrointestinal and cognitive symptoms described. **3. High-Yield Clinical Pearls for NEET-PG:** * **Casal’s Necklace:** A characteristic hyperpigmented, scaly rash around the neck seen in Pellagra. * **Jowar (Sorghum) Link:** In India, Pellagra is also associated with a diet high in Jowar due to high levels of **Leucine**, which interferes with tryptophan-to-niacin conversion. * **Amino Acid Precursor:** Remember the 60:1 ratio (Tryptophan to Niacin). * **Hartnup Disease:** A genetic disorder of tryptophan absorption that can lead to "pellagra-like" symptoms.

Question 206: According to ICMR, what is the daily requirement of cereals and pulses for a sedentary, strict vegetarian male?

A. 460 and 40 grams (Correct Answer)
B. 300 and 60 grams
C. 200 and 50 grams
D. 560 and 50 grams

Explanation: **Explanation:** The nutritional requirements for Indians are formulated by the **ICMR-NIN (National Institute of Nutrition)** based on age, gender, and physical activity levels. For a **sedentary male** (body weight approx. 60-65 kg), the primary goal is to maintain energy balance while ensuring adequate protein intake through a cereal-pulse combination. 1. **Why Option A is Correct:** According to the ICMR guidelines, a sedentary male requires approximately **460g of cereals** and **40g of pulses** daily. This ratio ensures a balanced intake of carbohydrates and proteins. In a strict vegetarian diet, the cereal-to-pulse ratio is kept at roughly **11:1** to optimize the **Protein Efficiency Ratio (PER)**, as cereals are limiting in lysine and pulses are limiting in methionine. 2. **Why Other Options are Incorrect:** * **Option B (300 and 60g):** This represents a higher pulse-to-cereal ratio often recommended for weight loss or diabetic diets, but does not meet the total energy requirements for a standard sedentary male. * **Option C (200 and 50g):** These values are too low to meet the Basal Metabolic Rate (BMR) and daily energy expenditure of an adult male. * **Option D (560 and 50g):** These values are closer to the requirements of a **Moderate or Heavy worker**, who requires significantly more calories to sustain physical labor. **High-Yield Pearls for NEET-PG:** * **Cereal:Pulse Ratio:** For optimum protein quality in a vegetarian diet, a ratio of **4:1** (by weight) is ideal, though practical dietary patterns often reflect higher cereal intake. * **Net Protein Utilization (NPU):** The NPU of Indian diets is generally calculated at **65%**. * **Energy Requirement:** A sedentary male requires approximately **2110 kcal/day** (as per recent ICMR-NIN 2020 updates; older guidelines cited 2320 kcal). * **Protein Requirement:** The current RDA is **0.83 g/kg body weight/day**.

Question 207: Which of the following is considered the first immunization for a newborn?

A. Colostrum (Correct Answer)
B. Handing over the baby to the mother
C. Oral Polio Vaccine (OPV)
D. DPT + BCG vaccine

Explanation: **Explanation:** **Colostrum** is the correct answer because it is biologically referred to as the **"first immunization"** of the newborn. It is the thick, yellowish milk secreted by the mammary glands during the first 2–3 days after delivery. It is exceptionally rich in **Secretory IgA (Immunoglobulin A)**, which coats the infant's intestinal mucosa, providing passive immunity and protecting against enteric and respiratory pathogens. It also contains high concentrations of lactoferrin, lysozymes, and macrophages. **Analysis of Incorrect Options:** * **Option B (Handing over the baby):** While essential for "Skin-to-Skin" contact (Kangaroo Mother Care) and bonding, it does not provide immunological protection. * **Option C (OPV):** Though the "Zero Dose" of OPV is given at birth, it is an artificial active immunization. Colostrum is considered the natural, primary immunological shield. * **Option D (DPT + BCG):** BCG is given at birth, but DPT is never given at birth (it starts at 6 weeks). Neither constitutes the "first" protection compared to the immediate availability of colostrum. **High-Yield NEET-PG Pearls:** * **Immunoglobulin Profile:** Colostrum is richest in **IgA**. In contrast, the immunoglobulin that crosses the placenta is **IgG**. * **Nutritional Value:** Compared to mature milk, colostrum has more protein, vitamins (A, D, E, K), and minerals, but **less fat and lactose**. * **Purgative Action:** Colostrum helps in the passage of **meconium**, preventing early neonatal jaundice. * **WHO Recommendation:** Exclusive breastfeeding should be initiated within **one hour** of birth.

Question 208: What is the approximate percentage of invisible fat in rice?

A. 1%
B. 2%
C. 3% (Correct Answer)
D. 5%

Explanation: **Explanation:** The concept of **invisible fat** refers to the fat naturally present within the cellular structure of food grains, pulses, and vegetables, which is not visible to the naked eye (unlike "visible fats" like ghee or oil). 1. **Why 3% is Correct:** Cereals are not just sources of carbohydrates; they contribute significantly to the total fat intake in the Indian diet due to the volume consumed. According to the ICMR and standard textbooks of Community Medicine (Park), **rice contains approximately 2.5% to 3% invisible fat**. While the fat content is low, it is rich in essential fatty acids, particularly linoleic acid. 2. **Analysis of Incorrect Options:** * **A (1%):** This is too low for whole or polished rice. While highly polished rice loses some nutrients, the baseline invisible fat remains closer to 2-3%. * **B (2%):** While closer, 3% is the standard value cited in most preventive and social medicine (PSM) references for competitive exams. * **D (5%):** This value is more characteristic of certain varieties of **Maize (Corn)** or specific pulses, rather than rice. 3. **High-Yield Clinical Pearls for NEET-PG:** * **Wheat vs. Rice:** Wheat contains about **3%** invisible fat, similar to rice. * **Highest Invisible Fat in Cereals:** **Bajra (Pearl Millet)** contains the highest amount of invisible fat, approximately **5%**. * **Pulses:** Generally contain **3-5%** invisible fat. * **Essential Fatty Acids:** Invisible fats in cereals and pulses are important because they provide a significant portion of the **Linoleic acid (Omega-6)** requirement in low-income populations. * **Total Fat Requirement:** For a balanced diet, invisible fat usually accounts for about 10% of the total energy intake.

Question 209: Cereal protein is deficient in which amino acid?

A. Leucine
B. Lysine (Correct Answer)
C. Phenylalanine
D. Tryptophan

Explanation: **Explanation:** The nutritional quality of a protein is determined by its **limiting amino acid**, which is the essential amino acid present in the smallest amount relative to human requirements. **1. Why Lysine is Correct:** Cereals (such as wheat, rice, and maize) are the primary source of energy in the Indian diet. However, they are universally **deficient in Lysine**. Conversely, cereals are relatively rich in methionine and cysteine (sulfur-containing amino acids). To achieve a "complete protein" profile, cereals are traditionally consumed with pulses (dal), which are rich in lysine but deficient in methionine. This is known as the **supplementary action of proteins**. **2. Analysis of Incorrect Options:** * **Leucine (A):** Most cereals contain adequate leucine. Notably, **Maize (Corn)** and **Jowar (Sorghum)** contain high levels of leucine. An excess of leucine can interfere with tryptophan metabolism, leading to Pellagra. * **Phenylalanine (C):** This is an essential amino acid generally found in sufficient quantities in most cereal grains. * **Tryptophan (D):** While most cereals have adequate tryptophan, **Maize** is uniquely deficient in both **Lysine and Tryptophan**. However, for the general category of "cereals," Lysine remains the primary deficiency. **3. High-Yield Clinical Pearls for NEET-PG:** * **Limiting Amino Acid in Pulses:** Methionine. * **Limiting Amino Acid in Cereals:** Lysine. * **The "Maize-Pellagra" Connection:** Maize is deficient in Tryptophan (a precursor to Niacin) and high in Leucine (which inhibits Niacin synthesis), leading to Niacin deficiency (Pellagra). * **Reference Protein:** Egg protein is considered the "standard" or reference protein (Biological Value = 100) because it contains all essential amino acids in the right proportions.

Question 210: What is the approximate proportion of protein and calories in the mid-day meal?

A. 1/2 protein and 1/2 calories
B. 1/2 protein and 1/3 calories (Correct Answer)
C. 1/3 protein and 1/3 calories
D. 1/3 protein and 2/3 calories

Explanation: ### Explanation The **Mid-Day Meal (MDM) Scheme**, now known as **PM POSHAN**, is a flagship school meal program in India designed to improve the nutritional status of school-age children and encourage school attendance. **1. Why Option B is Correct:** The nutritional guidelines for the Mid-Day Meal are specifically designed to supplement the child's home diet. The program aims to provide: * **Calories:** **1/3rd** of the total daily energy requirement. * **Protein:** **1/2 (50%)** of the total daily protein requirement. For a Primary school child (Class I-V), this translates to approximately **450 calories and 12g of protein**. For an Upper Primary child (Class VI-VIII), it provides **700 calories and 20g of protein**. The higher proportion of protein is prioritized to combat protein-energy malnutrition (PEM) and support rapid growth during school years. **2. Why Other Options are Incorrect:** * **Option A & D:** Providing 1/2 or 2/3 of daily calories in a single meal is logistically difficult and may lead to satiety issues, preventing the child from eating other meals at home. * **Option C:** While 1/3 of calories is correct, providing only 1/3 of protein is insufficient to bridge the "protein gap" often found in the cereal-heavy diets of rural or low-income Indian households. **3. High-Yield NEET-PG Pearls:** * **Iron & Folic Acid:** Under the Weekly Iron and Folic Acid Supplementation (WIFS) program, school children receive 1 blue IFA tablet (60mg elemental iron + 500mcg Folic acid) weekly. * **Deworming:** Albendazole (400mg) is administered twice yearly (National Deworming Day). * **Menu:** The guidelines mandate at least 50g of food grains for primary and 75g for upper primary, with a focus on local ingredients and pulses to ensure protein quality.

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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