Nutrition and Health — MCQs

Nutrition and Health Indian Medical PG Practice Questions and MCQs

Question 21: Which of the following is NOT a role of Fluorine in dental health?

A. To make enamel harder than usual (Correct Answer)
B. To replace several hydroxyl ions in hydroxyapatite
C. To make enamel several times less soluble
D. To promote deposition of calcium phosphate to 'heal' pits in enamel surface

Explanation: **Explanation:** Fluorine is often called a "double-edged sword" in public health because while it is essential for preventing dental caries, an excess leads to fluorosis. **Why Option A is the Correct Answer:** Contrary to popular belief, fluorine **does not make the enamel harder** than its original state. The hardness of enamel is primarily determined by its mineral density and crystalline structure during formation. Fluorine’s primary role is not structural reinforcement of "hardness," but rather **chemical stabilization** and **resistance to acid demineralization.** **Analysis of Incorrect Options:** * **Option B:** Fluorine works by a process of **ion substitution**. It replaces the hydroxyl (-OH) ions in the hydroxyapatite crystal lattice to form **Fluoroapatite**. * **Option C:** Fluoroapatite is significantly **less soluble** in acid than hydroxyapatite. This means when oral bacteria produce acid, the enamel is less likely to dissolve, thereby preventing cavities. * **Option D:** Fluorine acts as a catalyst to promote the **remineralization** of enamel. It attracts calcium and phosphate ions to the tooth surface, effectively "healing" or arresting early non-cavitated carious lesions (micro-pits). **High-Yield NEET-PG Pearls:** * **Optimal Fluoride Level in Water:** 0.5 to 0.8 mg/L (ppm). * **Dental Fluorosis:** Occurs when levels exceed 1.5 mg/L. It is characterized by "mottling" of enamel. * **Skeletal Fluorosis:** Occurs with prolonged intake of water containing >3–10 mg/L of fluoride. * **Defluoridation:** The **Nalgonda Technique** (using alum and lime) is the most common method used in India to remove excess fluoride from water.

Question 22: What is the increased energy requirement for women during the first six months of lactation?

A. 300 kcal
B. 400 kcal
C. 550 kcal (Correct Answer)
D. 450 kcal

Explanation: **Explanation:** The energy requirement during lactation is significantly higher than during pregnancy to support the production of breast milk, which has an average energy density of 0.67 kcal/ml. According to the **ICMR-NIN (2020) guidelines**, the additional energy requirement for a lactating mother during the first six months (0–6 months) is **+600 kcal/day**. However, based on the **older ICMR guidelines** (which are still frequently tested in NEET-PG), the requirement is **+550 kcal/day**. 1. **Why C is correct:** During the first six months, the infant is exclusively breastfed, and milk production is at its peak (approx. 750–800 ml/day). To produce this volume while maintaining maternal health, an additional 550 kcal is required. After six months (6–12 months), as complementary feeding begins, the requirement drops to **+400 kcal/day**. 2. **Why A is incorrect:** **300 kcal** (specifically +350 kcal in 2020 guidelines) is the additional daily requirement during the **second and third trimesters of pregnancy**, not lactation. 3. **Why B is incorrect:** **400 kcal** is the additional requirement for the **late lactation period (7–12 months)**. 4. **Why D is incorrect:** **450 kcal** does not correspond to any standard ICMR category for maternal energy increments. **High-Yield Clinical Pearls for NEET-PG:** * **Protein Increment:** +17 g/day (0–6 months) and +13 g/day (6–12 months) according to ICMR 2020. * **Net Energy:** A sedentary woman (1900 kcal) who is lactating (0–6 months) needs a total of 2450–2500 kcal/day. * **Iron:** Requirement actually *decreases* during lactation (compared to pregnancy) because of lactational amenorrhea, but remains higher than a non-pregnant state to replenish stores.

Question 23: Lysine is deficient in which of the following food groups?

A. Cereals (Correct Answer)
B. Pulses
C. Jowar
D. Soyabean

Explanation: **Explanation:** The concept of **Limiting Amino Acids** is a high-yield topic in Community Medicine. Proteins are composed of amino acids; if a food source lacks one or more essential amino acids, it is considered an "incomplete protein." **1. Why Cereals are the Correct Answer:** Cereals (such as wheat, rice, and maize) are the primary source of calories in the Indian diet. However, they are characteristically **deficient in Lysine**, which is their "limiting amino acid." Conversely, cereals are rich in sulfur-containing amino acids like **Methionine and Cysteine**. **2. Analysis of Incorrect Options:** * **Pulses (B) & Soyabean (D):** Pulses and legumes (including Soyabean) are the opposite of cereals. They are **rich in Lysine** but **deficient in Methionine**. This is why a "Cereal-Pulse combination" (e.g., Dal-Chawal) provides a complete amino acid profile through **mutual supplementation**. * **Jowar (C):** While Jowar is a cereal and also lacks lysine, it is more specifically associated with a high concentration of **Leucine**. An excess of Leucine interferes with the conversion of Tryptophan to Niacin, leading to **Pellagra** in sorghum/jowar eaters. **High-Yield Clinical Pearls for NEET-PG:** * **Limiting Amino Acid in Maize:** Lysine and Tryptophan. * **Limiting Amino Acid in Pulses:** Methionine. * **Limiting Amino Acid in Cereals:** Lysine. * **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. * **Net Protein Utilization (NPU):** Highest for Egg (96), followed by Milk (75-80), Meat (74), and Soyabean (61).

Question 24: Which of the following is NOT a true statement regarding the macronutrient and micronutrient composition of an egg?

A. Approximately 6 grams of protein
B. Approximately 6 grams of fat
C. Approximately 1.5 mg of Iron
D. Approximately 150 mg of Cholesterol (Correct Answer)

Explanation: The nutritional composition of a standard chicken egg (approx. 60g) is a high-yield topic in Community Medicine. **Explanation of the Correct Answer:** Option **D** is the incorrect statement because an average egg contains approximately **250 mg of cholesterol**, not 150 mg. This cholesterol is found exclusively in the egg yolk. For NEET-PG purposes, remember that while eggs are nutrient-dense, their high cholesterol content is the primary reason for recommending moderation in patients with dyslipidemia. **Analysis of Incorrect Options:** * **Option A (6g Protein):** This is **true**. An egg provides about 6–7 grams of high-quality protein. It is considered the "Reference Protein" (Biological Value = 94) because it contains all essential amino acids in the ideal proportion for human needs. * **Option B (6g Fat):** This is **true**. An egg contains about 5–6 grams of fat, almost all of which is concentrated in the yolk. This includes healthy polyunsaturated and monounsaturated fatty acids. * **Option C (1.5mg Iron):** This is **true**. Eggs are a good source of iron (approx. 1.2–1.5 mg), located in the yolk. However, the bioavailability is lower than meat due to the presence of phosvitin. **High-Yield Clinical Pearls for NEET-PG:** * **Reference Protein:** Egg protein is the gold standard for comparing the quality of other dietary proteins. * **Net Protein Utilization (NPU):** The NPU of an egg is **100**, the highest among all natural foods. * **Missing Nutrients:** Eggs are a complete food except for **Vitamin C and Carbohydrates**, which are virtually absent. * **Energy Value:** One average egg provides approximately **70–80 kcal**. * **Yolk vs. White:** The white (albumin) contains mainly protein (riboflavin/B2), while the yolk contains all the fat, cholesterol, and fat-soluble vitamins (A, D, E, K).

Question 25: Folic acid supplementation is necessary for whom?

A. Menstruating females
B. Elderly females
C. Pregnant females (Correct Answer)
D. All

Explanation: **Explanation:** **1. Why Pregnant Females is the Correct Answer:** Folic acid (Vitamin B9) is critical during pregnancy due to its role in DNA synthesis and rapid cell division. Supplementation is mandatory to prevent **Neural Tube Defects (NTDs)** like spina bifida and anencephaly. The demand for folate increases significantly during pregnancy to support fetal growth and placental development. Under the *Anemia Mukt Bharat* guidelines, pregnant women are prescribed **60 mg of elemental iron and 500 mcg (0.5 mg) of folic acid** daily for 180 days, starting from the second trimester. **2. Analysis of Incorrect Options:** * **Menstruating Females:** While they require Iron and Folic Acid (IFA) to prevent iron-deficiency anemia due to menstrual blood loss (Weekly Iron Folic Acid Supplementation - WIFS), the primary clinical "necessity" highlighted in public health and exams is the prevention of congenital anomalies in pregnancy. * **Elderly Females:** While they may suffer from macrocytic anemia, they are not a target group for routine mass folic acid supplementation unless a specific deficiency is diagnosed. * **All:** Since the physiological requirement for "supplementation" (beyond dietary intake) is most critical and universally mandated for pregnancy to prevent teratogenicity, "Pregnant females" is the most specific and correct choice. **3. High-Yield Clinical Pearls for NEET-PG:** * **Pre-conception dose:** To effectively prevent NTDs, 400 mcg of folic acid should ideally start **4 weeks before conception** and continue through the first trimester. * **High-risk dose:** Women with a previous history of a child with NTD should take a higher dose of **4 mg/day**. * **Diagnosis:** Folate deficiency leads to **Megaloblastic Anemia** (increased MCV, hypersegmented neutrophils). * **Public Health:** Under the National Iron Plus Initiative (NIPI), the IFA tablet for pregnant women is **Red-colored**.

Question 26: What obesity index is defined as Height (cm) - 100?

A. BMI
B. Broca's Index (Correct Answer)
C. Ponderal Index
D. Corpulence Index

Explanation: **Explanation:** The correct answer is **Broca's Index**. This is one of the simplest and earliest methods used to estimate "Ideal Body Weight" (IBW). 1. **Broca’s Index:** It is calculated using the formula: **Ideal Weight (kg) = Height (cm) – 100**. For example, if a person is 170 cm tall, their ideal weight according to Broca’s index would be 70 kg. While easy to use, it is less accurate than modern indices as it does not account for age or body frame variations. 2. **Why other options are incorrect:** * **BMI (Body Mass Index/Quetelet’s Index):** Defined as **Weight (kg) / Height (m²)**. It is the most widely used diagnostic tool for obesity. * **Ponderal Index (Rohrer's Index):** Defined as **Weight (kg) / Height (m³)**. It is primarily used in pediatrics to assess fetal growth or newborn proportionality. * **Corpulence Index:** Defined as **Actual Weight / Desired Weight**. A value >1.20 is generally considered indicative of obesity. **High-Yield Clinical Pearls for NEET-PG:** * **Quetelet’s Index** is another name for BMI. * **Lorentz’s Formula:** A more refined version of Broca’s index: $Height (cm) - 100 - [\frac{Height (cm) - 150}{4 \text{ (for men) or } 2 \text{ (for women)}}]$. * **Waist-Hip Ratio (WHR):** A better indicator of upper body (android) obesity. Obesity is defined as WHR **>0.9 in men** and **>0.85 in women**. * **Waist Circumference:** The best indicator of visceral fat. Risk increases at **>90 cm in Indian men** and **>80 cm in Indian women**.

Question 27: What is the minimum recommended consumption level of polyunsaturated fatty acids (PUFA) by the WHO/FAO expert group on diet, nutrition, and prevention of chronic diseases?

A. 5%
B. 6% (Correct Answer)
C. 8%
D. 10%

Explanation: **Explanation:** The WHO/FAO Expert Consultation on Diet, Nutrition, and the Prevention of Chronic Diseases (Technical Report Series 916) provides specific guidelines for the intake of fatty acids to reduce the risk of non-communicable diseases (NCDs). **1. Why 6% is Correct:** The WHO/FAO expert group recommends that **Polyunsaturated Fatty Acids (PUFAs)** should contribute between **6% to 10%** of the total daily energy intake. The **minimum** recommended level is specifically set at **6%** to ensure an adequate supply of essential fatty acids (Linoleic and Alpha-linolenic acid) and to maintain cardiovascular health. **2. Analysis of Incorrect Options:** * **A. 5%:** While some older guidelines suggested lower limits, the current WHO/FAO consensus for chronic disease prevention sets the floor at 6%. * **C. 8%:** This falls within the recommended range (6-10%) but is not the *minimum* threshold. * **D. 10%:** This represents the **maximum** recommended limit for PUFA intake. Consuming more than 10% of total energy from PUFAs is not recommended due to potential risks of lipid peroxidation and suppression of HDL cholesterol. **3. High-Yield NEET-PG Clinical Pearls:** * **Total Fat Intake:** Should be between **15% to 30%** of total energy. * **Saturated Fatty Acids (SFA):** Should be restricted to **less than 10%** (and <7% for high-risk groups). * **Trans-fatty acids:** Should be **less than 1%** of total energy. * **Monounsaturated Fatty Acids (MUFA):** Calculated as the remainder (Total Fat - SFA - PUFA - Trans fat). * **P/S Ratio:** A balanced diet should ideally maintain a Polyunsaturated to Saturated fat ratio of **0.8 to 1.0**.

Question 28: All of the following are true regarding dietary fibers EXCEPT:

A. Increases stool transit time (Correct Answer)
B. Binds to bile salts and reduces their reabsorption
C. Inhibits faecal mutagen synthesis
D. Reduces postprandial glucose levels

Explanation: **Explanation:** The correct answer is **A (Increases stool transit time)** because dietary fiber actually **decreases** stool transit time. **1. Why Option A is the Correct (False) Statement:** Dietary fiber, particularly insoluble fiber (cellulose, hemicellulose, and lignin), acts as a bulking agent. It absorbs water, increases fecal mass, and stimulates peristalsis. This leads to a **faster** passage of stool through the colon, thereby **decreasing** the transit time. A shorter transit time reduces the duration during which the colonic mucosa is exposed to potential carcinogens. **2. Analysis of Other Options:** * **Option B (Binds to bile salts):** Soluble fibers (pectins, gums) bind to bile salts in the intestine, preventing their enterohepatic circulation. This forces the liver to use more cholesterol to synthesize new bile salts, effectively lowering serum cholesterol levels. * **Option C (Inhibits faecal mutagen synthesis):** By altering gut microflora and lowering colonic pH, fiber inhibits the bacterial degradation of bile salts into secondary bile acids (which are potential mutagens), thus offering protection against colorectal cancer. * **Option D (Reduces postprandial glucose):** Soluble fiber forms a viscous gel in the gut, slowing gastric emptying and delaying the absorption of glucose. This prevents rapid "spikes" in blood sugar after meals. **Clinical Pearls for NEET-PG:** * **Recommended Intake:** 40g of dietary fiber per 2000 kcal. * **Sources:** Whole grains, legumes, fruits, and vegetables. * **Protective Role:** High fiber intake is associated with a reduced risk of Coronary Heart Disease (CHD), Type 2 Diabetes, Obesity, and Diverticular disease. * **Key Distinction:** *Insoluble fiber* is primarily responsible for laxation (decreasing transit time), while *soluble fiber* is primarily responsible for metabolic benefits (cholesterol and glucose lowering).

Question 29: Lathyrism is due to:

A. Aflatoxin
B. Beta oxalyl amino acid (Correct Answer)
C. Saccharin
D. Cyclamate

Explanation: **Explanation:** **Lathyrism** is a non-progressive but permanent spastic paraplegia caused by the excessive consumption of **Khesari Dal (*Lathyrus sativus*)**. The disease is caused by the neurotoxin **BOAA (Beta-oxalyl-amino-alanine)**, also known as ODAP. This toxin acts as an excitatory neurotoxin, leading to the destruction of upper motor neurons in the spinal cord. It typically affects young males (15–45 years) during periods of famine when Khesari Dal becomes a staple food. **Analysis of Options:** * **Beta oxalyl amino acid (Correct):** This is the specific neurotoxin found in *Lathyrus sativus*. It is heat-stable but water-soluble. * **Aflatoxin:** Produced by *Aspergillus flavus*, this toxin contaminates stored grains (like groundnuts and maize) and is a major risk factor for **Hepatocellular Carcinoma**. * **Saccharin & Cyclamate:** These are artificial sweeteners. While historically linked to bladder cancer in high-dose rodent studies, they are not associated with Lathyrism. **High-Yield Clinical Pearls for NEET-PG:** 1. **Stages of Lathyrism:** Latent stage → No-stick stage → One-stick stage → Two-stick stage → Crawler stage. 2. **Prevention:** The safest method is to limit Khesari Dal intake to <1/3rd of the diet. 3. **Toxin Removal:** BOAA can be removed by **steeping** (soaking in hot water and draining) or **parboiling**. 4. **Legal Aspect:** The Prevention of Food Adulteration Act once banned its sale, though some states have recently lifted bans on specific varieties. 5. **Neurolathyrism vs. Osteolathyrism:** Human Lathyrism is primarily *neurolathyrism*; *osteolathyrism* (affecting bone/collagen) is usually seen in animal models.

Question 30: Which of the following diseases can prove fatal in combination with malnutrition among children under 5 years of age?

A. Anemia
B. Tetanus
C. Measles (Correct Answer)
D. Diarrhoea

Explanation: **Explanation:** The synergistic relationship between **malnutrition and infection** is a cornerstone of pediatric public health. Among the options provided, **Measles** is the most notorious for its fatal synergy with malnutrition. **Why Measles is the Correct Answer:** Measles causes a state of severe **secondary immunosuppression** (by depleting T-lymphocytes and suppressing cytokine responses). In a malnourished child, who already has "nutritional thymectomy" (atrophy of lymphoid tissue), measles leads to catastrophic complications like giant-cell pneumonia, secondary bacterial infections, and severe keratomalacia due to acute Vitamin A depletion. This "vicious cycle" significantly increases the Case Fatality Rate (CFR) in malnourished populations. **Analysis of Incorrect Options:** * **Anemia (A):** While anemia is a component of malnutrition (micronutrient deficiency), it is generally a chronic condition rather than an acute infectious trigger that causes rapid mortality in the same synergistic way as measles. * **Tetanus (B):** Tetanus mortality is primarily determined by the toxin load and the quality of intensive care (ventilation/antispasmodics), rather than the underlying nutritional status of the child. * **Diarrhoea (D):** While diarrhea is a major cause of death in malnourished children, the question asks for the disease most classically associated with fatal outcomes in this context. In many standardized exams (and WHO guidelines), Measles is highlighted as the "greatest killer" when combined with protein-energy malnutrition (PEM). **High-Yield NEET-PG Pearls:** * **Vitamin A Supplementation:** Administering two doses of Vitamin A (24 hours apart) is mandatory in measles management to reduce mortality by 50%. * **The Cycle:** Malnutrition $\rightarrow$ Decreased Immunity $\rightarrow$ Increased Infection $\rightarrow$ Malabsorption/Anorexia $\rightarrow$ Worsening Malnutrition. * **WHO Fact:** Measles remains one of the leading causes of death among young children globally, despite the availability of a safe and effective vaccine.

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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