Nutrition and Health — MCQs

Nutrition and Health Indian Medical PG Practice Questions and MCQs

Question 81: Golden rice, a genetically modified variety, is primarily developed to address the deficiency of which nutrient?

A. Vitamin A (Correct Answer)
B. Vitamin C
C. Calcium
D. Zinc

Explanation: **Explanation:** **Golden Rice** is a genetically modified (biofortified) variety of *Oryza sativa* produced to biosynthesize **beta-carotene**, a precursor of **Vitamin A**, in the edible parts of the rice. 1. **Why Vitamin A is correct:** In many developing countries, rice is a staple food but lacks essential micronutrients. By inserting genes from maize and a soil bacterium (*Erwinia uredovora*), scientists enabled the rice grain to produce beta-carotene. Once ingested, the body converts this into Retinol (Vitamin A). This intervention specifically targets **Vitamin A Deficiency (VAD)**, which is a leading cause of preventable childhood blindness and increased mortality from infectious diseases (like measles) in low-income regions. 2. **Why other options are incorrect:** * **Vitamin C:** Deficiencies (Scurvy) are typically managed through the consumption of citrus fruits and fresh vegetables, not cereal biofortification. * **Calcium:** While vital for bone health, calcium deficiency is not the primary target of the Golden Rice project. * **Zinc:** Although "Zinc-fortified rice" exists as a separate biofortification effort to combat stunting and immune dysfunction, it is not the defining characteristic of "Golden Rice." **High-Yield Clinical Pearls for NEET-PG:** * **The "Golden" Color:** The characteristic yellow-orange hue of the grain is due to the presence of carotenoids. * **VAD Manifestations:** The earliest clinical sign is **Conjunctival Xerosis**, while the earliest symptom is **Night Blindness (Nyctalopia)**. **Bitot’s spots** are a pathognomonic sign. * **Public Health Strategy:** Golden Rice is an example of **Biofortification** (breeding crops to increase nutritional value), which differs from *fortification* (adding nutrients during processing, e.g., Iodized salt).

Question 82: A patient is classified as obese if their Body Mass Index (BMI) is:

A. 20-30
B. greater than 30 (Correct Answer)
C. greater than 25
D. greater than 40

Explanation: **Explanation:** The Body Mass Index (BMI), or Quetelet index, is the standard epidemiological tool used to classify weight status in adults. It is calculated as weight in kilograms divided by the square of height in meters ($kg/m^2$). According to the **WHO Classification for BMI**: * **Underweight:** < 18.5 * **Normal range:** 18.5 – 24.9 * **Overweight (Pre-obese):** 25.0 – 29.9 * **Obese:** $\geq$ 30.0 **Analysis of Options:** * **Option B (Correct):** A BMI of **30 or greater** is the international threshold for defining obesity. It is further subdivided into Class I (30–34.9), Class II (35–39.9), and Class III ($\geq$ 40). * **Option A:** This range spans from "Normal" to "Overweight." It does not define a specific clinical category. * **Option C:** A BMI > 25 defines the "Overweight" category. While this indicates excess weight, it is not yet classified as clinical obesity. * **Option D:** A BMI > 40 defines **Class III Obesity** (formerly known as Morbid Obesity). While these patients are obese, the definition of obesity begins at 30. **High-Yield Clinical Pearls for NEET-PG:** 1. **Asian-Indian Specific Guidelines:** Due to a higher risk of metabolic syndrome at lower BMIs, the criteria for Indians are lower: **Overweight is 23–24.9** and **Obesity is $\geq$ 25**. 2. **Ponderal Index:** Calculated as $Height\ (cm) / \sqrt[3]{Weight\ (kg)}$. It is considered more sensitive than BMI for certain pediatric assessments. 3. **Waist-Hip Ratio (WHR):** A better indicator of upper body (android) obesity. Risk increases if WHR is **> 0.9 in men** or **> 0.85 in women**.

Question 83: Which of the following parameters, when normal, is specific in ruling out malnutrition?

A. Total body water
B. Normal skin fold thickness
C. Normal lean body mass (Correct Answer)
D. Normal BMI

Explanation: **Explanation:** The core concept in assessing nutritional status is distinguishing between **body weight** and **body composition**. **Why Lean Body Mass (LBM) is the correct answer:** Lean body mass represents the weight of the body minus the fat (including muscles, bones, organs, and water). In protein-energy malnutrition (PEM), particularly in chronic states, the body undergoes catabolism of muscle proteins to provide amino acids for essential functions. Therefore, a **normal lean body mass** is the most specific indicator that the body’s protein stores are intact and that no significant wasting has occurred. It directly reflects the "functional" mass of the body, making it the gold standard for ruling out malnutrition. **Analysis of Incorrect Options:** * **Total Body Water (A):** This is unreliable because malnutrition (especially Kwashiorkor) is often associated with **increased** total body water due to edema, despite severe tissue wasting. * **Normal Skin Fold Thickness (B):** This measures subcutaneous fat. While it indicates energy stores, a person can have normal fat stores but suffer from significant muscle wasting (sarcopenic malnutrition), making it less specific than LBM. * **Normal BMI (D):** BMI is a crude measure that does not differentiate between fat, muscle, and water. A patient with "masked malnutrition" may have a normal BMI due to obesity or pathological fluid retention (edema) while being severely protein-deficient. **High-Yield Facts for NEET-PG:** * **Mid-Upper Arm Circumference (MUAC):** The best field tool for screening malnutrition in children (1–5 years); <11.5 cm indicates SAM (Severe Acute Malnutrition). * **Quetelet’s Index:** Another name for BMI ($Weight/Height^2$). * **Growth Monitoring:** The most sensitive indicator of health status in children is the "Road to Health" chart (weight-for-age). * **Specific Indicator:** Serum Albumin is a common biochemical marker, but LBM remains the anatomical specific parameter for ruling out wasting.

Question 84: What percentage of protein does rice contain?

A. 20% protein
B. 12% protein
C. 14% protein
D. 6.8% protein (Correct Answer)

Explanation: **Explanation:** The protein content of cereals is a high-yield topic in Community Medicine. Among common cereals, **rice** contains approximately **6% to 9% protein**, with the standard value often cited as **6.8%**. **Why 6.8% is correct:** While rice has the lowest quantity of protein compared to other cereals (like wheat or maize), it possesses the **highest biological value** (approx. 80). The primary protein in rice is **Oryzenin**. Its limiting amino acid is **Lysine**, but it is relatively rich in sulfur-containing amino acids (Methionine and Cysteine). **Analysis of Incorrect Options:** * **Option A (20%):** This range is characteristic of **Pulses** (e.g., Bengal gram, Green gram), which typically contain 20–25% protein. * **Option B (12%):** This is the approximate protein content of **Wheat** (11.8% to 12%). Wheat is richer in protein than rice but has a lower biological value (approx. 65) due to the limitation of Lysine and Threonine. * **Option C (14%):** This value is higher than the standard protein content for common staple cereals and does not correspond to rice. **High-Yield Clinical Pearls for NEET-PG:** * **Net Protein Utilization (NPU):** Rice has an NPU of approximately 65, which is superior to wheat (NPU ~49). * **Milling Loss:** Excessive milling of rice leads to the loss of **Thiamine (Vitamin B1)**, resulting in **Beri-beri**. * **Parboiling:** This process (soaking and steaming) drives B-vitamins from the outer layers into the grain, preventing nutrient loss during subsequent polishing. * **Limiting Amino Acid:** For all cereals (including rice), the limiting amino acid is **Lysine**. For pulses, it is **Methionine**. This is why a cereal-pulse combination provides a "complete" protein profile.

Question 85: Which test is used to assess the quality of pasteurized milk?

A. Phosphatase test (Correct Answer)
B. Methylene blue test
C. Catalase test
D. Oxidase test

Explanation: **Explanation:** **Phosphatase Test (Correct Answer):** The Phosphatase test is the standard biochemical method used to check the **efficiency of pasteurization**. Alkaline phosphatase is an enzyme naturally present in raw milk. It is slightly more heat-resistant than the most heat-tolerant non-spore-forming pathogen found in milk, *Coxiella burnetii* (the causative agent of Q fever). Therefore, if the pasteurization process is successful, the enzyme is completely inactivated. A positive test (presence of the enzyme) indicates either inadequate heating or post-pasteurization contamination with raw milk. **Analysis of Incorrect Options:** * **Methylene Blue Reduction Test (MBRT):** This test is used to assess the **bacteriological quality** (microbial load) of raw milk. It measures the metabolic activity of bacteria; a rapid disappearance of the blue color indicates a high bacterial count and poor keeping quality. * **Catalase Test:** Primarily used in microbiology to differentiate Staphylococci (positive) from Streptococci (negative). In milk, it can be used to detect the presence of leucocytes (indicating mastitis), but it is not a test for pasteurization quality. * **Oxidase Test:** Used in microbiology to identify bacteria that produce the enzyme cytochrome c oxidase (e.g., *Pseudomonas*, *Neisseria*). It has no role in milk quality assessment. **High-Yield Clinical Pearls for NEET-PG:** * **Standard Pasteurization Methods:** 1. **Holder Method:** 63°C (145°F) for 30 minutes. 2. **HTST (High-Temperature Short-Time):** 72°C (161°F) for 15 seconds. * **Standard for Milk Safety:** The Phosphatase test is the "Gold Standard" for process control. * **Coliform Count:** While the Phosphatase test checks for heat treatment, the **Coliform test** is used to check for post-pasteurization contamination (cleanliness of the plant).

Question 86: What are the limiting amino acids in wheat?

A. Methionine and lysine
B. Lysine and threonine (Correct Answer)
C. Threonine and methionine
D. Arginine and lysine

Explanation: **Explanation:** The concept of **limiting amino acids** refers to the essential amino acid present in the smallest quantity in a food source relative to human requirements. This deficiency limits the body's ability to synthesize proteins, even if other amino acids are abundant. **Why Option B is Correct:** Cereals, including wheat, are generally deficient in **Lysine**. While Lysine is the primary limiting amino acid in wheat, **Threonine** is considered the second limiting amino acid. Therefore, the combination of Lysine and Threonine represents the most accurate profile of wheat's nutritional limitations. **Analysis of Incorrect Options:** * **Option A & C (Methionine):** Methionine is a sulfur-containing amino acid. Cereals are actually **rich in Methionine** but deficient in Lysine. Conversely, pulses (legumes) are rich in Lysine but deficient in Methionine. * **Option D (Arginine):** Arginine is a semi-essential amino acid and is not typically the primary limiting factor in major cereal grains like wheat. **High-Yield Clinical Pearls for NEET-PG:** * **Mutual Supplementation:** To achieve a "complete protein" profile, cereals (deficient in lysine) should be eaten with pulses (deficient in methionine). This is the physiological basis for traditional diets like *Dal-Chawal* or *Roti-Dal*. * **Maize (Corn):** The limiting amino acids are **Lysine and Tryptophan**. A deficiency of Tryptophan (a precursor to Niacin) leads to **Pellagra**. * **Rice:** The primary limiting amino acid is **Lysine**. * **Pulses:** The primary limiting amino acid is **Methionine**. * **Reference Protein:** Egg protein is considered the "standard" or reference protein (Biological Value = 100) because it contains all essential amino acids in the correct proportions.

Question 87: Which of the following is NOT included in the spectrum of Iodine Deficiency Disorders (IDD)?

A. Stillbirth
B. Hyperactivity (Correct Answer)
C. Deafness
D. Delayed development

Explanation: **Explanation:** Iodine is essential for the synthesis of thyroid hormones (T3 and T4), which are critical for fetal brain development and metabolic regulation. **Iodine Deficiency Disorders (IDD)** encompass a spectrum of clinical consequences resulting from inadequate iodine intake. **Why Hyperactivity is the correct answer:** Iodine deficiency during pregnancy and early childhood leads to **hypothyroidism**, which typically results in **mental retardation and lethargy**, rather than hyperactivity. Hyperactivity (often associated with ADHD) is not a recognized clinical feature of the IDD spectrum. In fact, severe iodine deficiency leads to Cretinism, characterized by profound cognitive impairment and sluggishness. **Why the other options are part of the IDD spectrum:** * **Stillbirth (Option A):** Severe iodine deficiency in the mother increases the risk of intrauterine death, spontaneous abortion, and stillbirths. * **Deafness (Option B):** Deaf-mutism is a hallmark feature of **Neurological Cretinism**, caused by iodine deficiency during the second trimester of pregnancy. * **Delayed Development (Option D):** Iodine is vital for myelination and neuronal migration. Deficiency leads to delayed physical and mental milestones, ranging from mild cognitive impairment to severe cretinism. **High-Yield Clinical Pearls for NEET-PG:** * **The IDD Spectrum:** Includes Goitre, hypothyroidism, impaired mental function, retarded physical development, and increased perinatal mortality. * **Indicator of Choice:** The most sensitive indicator for monitoring iodine status in a community is **Urinary Iodine Excretion (UIE)**. * **Goitre Rate:** A community is considered to have an endemic problem if the Total Goitre Rate (TGR) is **>5%** among primary school children. * **Iodization:** Under the National Iodine Deficiency Disorders Control Programme (NIDDCP), salt is iodized with **Potassium Iodate**. The level at the production point is **30 ppm** and at the consumer level is **15 ppm**.

Question 88: Which fruit contains the maximum calories?

A. Banana (Correct Answer)
B. Mango
C. Orange
D. Pear

Explanation: **Explanation:** The caloric density of fruits is primarily determined by their carbohydrate content (sugars and starches) and water content. Among the options provided, **Banana** is the most calorie-dense fruit. 1. **Banana (Correct):** A medium-sized banana provides approximately **89–116 kcal per 100g**. It is rich in carbohydrates (around 23g/100g), including resistant starch and sugars like sucrose, fructose, and glucose. Its lower water content compared to citrus fruits contributes to its higher energy density. 2. **Mango:** While considered a high-sugar fruit, mangoes typically provide about **60–70 kcal per 100g**. While sweet, their higher water content makes them less calorically dense than bananas. 3. **Orange:** As a citrus fruit with very high water content (approx. 87%), oranges provide only about **47–50 kcal per 100g**. 4. **Pear:** Pears are high in fiber but have a high water content, providing approximately **57–58 kcal per 100g**. **High-Yield Facts for NEET-PG:** * **Highest Calorie Fruit:** While not in the options, **Avocado** (approx. 160 kcal/100g due to healthy fats) and **Dates/Dry fruits** (approx. 280 kcal/100g due to dehydration) are even higher. * **Glycemic Index (GI):** Bananas have a medium GI (51), making them a quick energy source for athletes but requiring caution in diabetic meal planning. * **Potassium Source:** Bananas are a classic high-yield source of Potassium (approx. 358 mg/100g), essential for managing hypertension and preventing muscle cramps. * **Vitamin C:** Among the options, **Orange** is the richest source of Vitamin C, crucial for collagen synthesis and immunity.

Question 89: In iron deficiency anemia, after hemoglobin level has returned to normal, how long should iron tablets be recommended to replenish iron stores?

A. 0-3 months (Correct Answer)
B. 3-6 months
C. 6-12 months
D. 12-24 months

Explanation: ### Explanation **1. Why Option A is Correct:** The primary goal of treating Iron Deficiency Anemia (IDA) is two-fold: first, to restore hemoglobin (Hb) levels to normal, and second, to replenish the body's depleted iron stores (ferritin). According to standard clinical guidelines (including WHO and Park’s Preventive and Social Medicine), once the hemoglobin level reaches the normal range, iron supplementation should be continued for an additional **2 to 3 months (0–3 months range)**. This duration is typically sufficient to saturate the bone marrow and liver stores, preventing a rapid relapse of anemia. **2. Why Other Options are Incorrect:** * **Option B (3-6 months):** While some chronic cases or severe malabsorption might require longer therapy, 3 months is the standard benchmark for store replenishment in general public health guidelines. * **Options C & D (6-24 months):** These durations are excessively long for standard IDA. Prolonged unnecessary iron intake can lead to gastrointestinal side effects (constipation, nausea) and, in extreme cases, iron overload (hemosiderosis). **3. High-Yield Clinical Pearls for NEET-PG:** * **First sign of response:** An increase in the **Reticulocyte count** (usually seen within 5–10 days of starting therapy). * **Rate of Hb rise:** Expect an increase of approximately **0.7–1.0 g/dL per week**. * **Best Absorption:** Oral iron is best absorbed on an empty stomach or with Vitamin C (Citrus fruits). Avoid taking it with tea, coffee, or calcium, as they inhibit absorption. * **Prophylaxis in Pregnancy (IFA program):** 100 mg elemental iron + 500 mcg Folic acid for 180 days during pregnancy and 180 days postpartum. * **Therapeutic Dose (IFA program):** Double the prophylactic dose (i.e., twice daily) if the patient is clinically anemic.

Question 90: Which of the following foods has a low glycemic index?

A. Corn flakes
B. Brown rice
C. Lentils (Correct Answer)
D. White bread

Explanation: **Explanation:** The **Glycemic Index (GI)** is a ranking of carbohydrates on a scale of 0 to 100 based on how quickly they raise blood glucose levels after consumption. Foods with a **Low GI (≤ 55)** are digested and absorbed slowly, causing a gradual rise in blood sugar, which is beneficial for managing diabetes and obesity. **Why Lentils are the correct answer:** Lentils (and most pulses/legumes) have a low GI (typically between 20–35). This is due to their high content of **soluble fiber** and complex carbohydrates, which slow down gastric emptying and enzymatic digestion. They also contain "resistant starch," which escapes digestion in the small intestine, further stabilizing postprandial glucose levels. **Analysis of Incorrect Options:** * **Corn flakes (GI ≈ 80-90):** These are highly processed, refined cereals with a very high GI, causing rapid glucose spikes. * **White bread (GI ≈ 75):** Made from refined flour (maida), it lacks fiber and is rapidly hydrolyzed into glucose. * **Brown rice (GI ≈ 68):** While healthier than white rice (GI ≈ 73) due to higher fiber content, brown rice still falls into the **Medium GI** category (56–69). It is not considered a "low GI" food compared to legumes. **NEET-PG High-Yield Pearls:** * **Glycemic Load (GL):** A more accurate measure than GI, as it accounts for the portion size (GL = GI × Carbohydrate per serving / 100). * **Factors lowering GI:** High fiber content, presence of fat/protein, acidity (vinegar/lemon), and less processing/cooking. * **Clinical Utility:** Low GI diets are the cornerstone of Medical Nutrition Therapy (MNT) for **Diabetes Mellitus Type 2, PCOD, and Metabolic Syndrome.**

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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