Nutrition and Health — MCQs

Nutrition and Health Indian Medical PG Practice Questions and MCQs

Question 331: Which of the following oils does NOT contain n-3 polyunsaturated fatty acids (PUFA)?

A. Mustard oil
B. Corn oil
C. Fish oil
D. Groundnut oil (Correct Answer)

Explanation: ### Explanation The core of this question lies in distinguishing between the two main families of Essential Fatty Acids (EFAs): **n-6 (Omega-6)** and **n-3 (Omega-3)** polyunsaturated fatty acids. **Why Groundnut oil is the correct answer:** Groundnut oil (Peanut oil) is primarily composed of Monounsaturated Fatty Acids (MUFA), specifically Oleic acid, and n-6 PUFA (Linoleic acid). It contains **negligible to zero n-3 PUFA** (Alpha-linolenic acid). In the context of the Indian diet, while it is a good source of MUFA, it does not contribute to the n-3 requirement. **Analysis of Incorrect Options:** * **Mustard oil:** This is a high-yield fact for NEET-PG. Unlike many other vegetable oils, mustard oil is a significant source of **Alpha-linolenic acid (n-3)**, making it heart-friendly in terms of its n-6:n-3 ratio (roughly 1:1). * **Corn oil:** While predominantly high in n-6 PUFA, corn oil contains small, measurable amounts (approx. 1%) of n-3 PUFA. * **Fish oil:** This is the richest source of long-chain n-3 PUFAs, specifically **EPA (Eicosapentaenoic acid)** and **DHA (Docosahexaenoic acid)**, which are vital for cardiovascular health and brain development. **High-Yield Clinical Pearls for NEET-PG:** * **Ideal n-6 to n-3 Ratio:** The WHO/FAO recommends a ratio of **5:1 to 10:1**. Most modern diets are skewed towards 20:1. * **Rich n-3 Sources:** Flaxseed (Linseed) oil is the richest plant source; Soyabean and Mustard oils are also good sources. * **Safflower/Sunflower oils:** These are "pure" n-6 oils and lack n-3 PUFA. * **Invisible Fats:** These contribute significantly to the total fat intake in Indian diets, often providing a better EFA profile than visible fats alone.

Question 332: Under the Antyodaya Anna Yojana, wheat is provided at what rate per kilogram?

A. Rs. 2/Kg (Correct Answer)
B. Rs. 3/Kg
C. Rs. 5/Kg
D. Rs. 6/Kg

Explanation: **Explanation:** The **Antyodaya Anna Yojana (AAY)** was launched in December 2000 to serve the "poorest of the poor" among the Below Poverty Line (BPL) population. Under the National Food Security Act (NFSA) 2013, this scheme ensures food security by providing highly subsidized food grains to eligible households. **1. Why Option A is Correct:** Under AAY, the Central Government provides food grains at specific **Central Issue Prices (CIP)**. The current rates are: * **Wheat:** Rs. 2 per kg * **Rice:** Rs. 3 per kg * **Coarse Grains:** Rs. 1 per kg Therefore, wheat is provided at **Rs. 2/kg**. **2. Why Other Options are Incorrect:** * **Option B (Rs. 3/Kg):** This is the subsidized rate for **Rice** under the AAY and NFSA. * **Option C (Rs. 5/Kg) & Option D (Rs. 6/Kg):** These figures do not correspond to the subsidized rates under the AAY. Historically, these might relate to older BPL/APL rates or open market prices, but they are irrelevant to the current AAY mandate. **High-Yield Clinical Pearls for NEET-PG:** * **Quantity:** Each AAY household is entitled to **35 kg** of food grains per month, regardless of the number of family members. * **Priority Households (PHH):** Under NFSA, PHH receive **5 kg** of food grains per person per month at the same subsidized rates (3/2/1). * **Target Population:** AAY targets households headed by widows, terminally ill persons, disabled persons, or senior citizens with no assured means of subsistence. * **Recent Update:** Since January 2023, the government has integrated these schemes under the **Pradhan Mantri Garib Kalyan Anna Yojana (PMGKAY)**, providing these rations **free of cost** to beneficiaries for a specified period, though the statutory rates under NFSA remain 3/2/1.

Question 333: Which type of milk provides the highest amount of calories per 100ml?

A. Human milk
B. Cow milk
C. Buffalo milk (Correct Answer)
D. Goat milk

Explanation: The caloric value of milk is primarily determined by its **fat content**, as fat provides 9 kcal/g compared to the 4 kcal/g provided by proteins and carbohydrates. ### Why Buffalo Milk is Correct **Buffalo milk** contains the highest amount of fat (approx. 6.5g to 7g per 100ml) among the common domestic sources. Consequently, it yields the highest energy, providing approximately **100–117 kcal per 100ml**. It is also richer in total solids, calcium, and phosphorus compared to cow or human milk. ### Analysis of Incorrect Options * **Human Milk:** Contains about 3.5g of fat and provides approximately **65–70 kcal per 100ml**. While it is the gold standard for infant nutrition due to its immunological properties and whey-to-casein ratio, it is lower in calories than buffalo milk. * **Cow Milk:** Contains about 3.5g to 4g of fat and provides approximately **67 kcal per 100ml**. Its composition is similar to human milk in terms of calories, though it has higher protein (casein) and lower lactose content. * **Goat Milk:** Provides approximately **70–75 kcal per 100ml**. While slightly higher in calories than cow milk, it still falls significantly short of buffalo milk. ### NEET-PG High-Yield Pearls * **Fat Content Ranking:** Buffalo > Goat > Cow ≈ Human. * **Protein Content:** Buffalo milk has the highest protein (~4.3g), while Human milk has the lowest (~1.1g). * **Iron Deficiency:** All types of milk are **poor sources of Iron** and Vitamin C. * **Specific Gravity:** Buffalo milk has a higher specific gravity than cow milk due to higher solid content. * **Clinical Note:** Buffalo milk is often diluted for infant feeding because its high solute load and curd tension can be difficult for an infant's immature digestive system and kidneys to process.

Question 334: The Methylene blue test for milk is primarily used to detect which of the following?

A. Microorganisms (Correct Answer)
B. Lactose
C. Proteins
D. Sugars

Explanation: **Explanation:** The **Methylene Blue Reduction Test (MBRT)** is a rapid screening method used to assess the **bacteriological quality** of raw and pasteurized milk. **Why Microorganisms is the correct answer:** The test is based on the principle that metabolic activities of aerobic bacteria in milk consume dissolved oxygen. Methylene blue is an oxidation-reduction indicator; it is blue in an oxidized state and becomes colorless (leuco-form) when reduced. As microorganisms multiply, they deplete oxygen and release reducing enzymes (reductases), causing the dye to lose its color. The **speed of decolorization** is directly proportional to the microbial load: the shorter the time taken for the milk to turn white, the higher the bacterial count and the poorer the quality of the milk. **Why other options are incorrect:** * **Lactose & Sugars:** These are carbohydrates. Their presence is usually checked via polarimetry or specific chemical tests (like Benedict’s for reducing sugars) to detect adulteration, not microbial activity. * **Proteins:** Milk protein (Casein) content is typically measured using the Kjeldahl method or formal titration, not through redox indicators. **High-Yield Clinical Pearls for NEET-PG:** * **Grading:** Milk is considered "Very Good" if it takes >6 hours to decolorize and "Poor" if it decolorizes in <2 hours. * **Phosphatase Test:** Do not confuse MBRT with the Phosphatase test. While MBRT checks for bacterial load, the Phosphatase test is the gold standard to check the **efficiency of pasteurization**. * **Standard:** MBRT is a measure of the "keeping quality" of milk.

Question 335: Which of the following is NOT used for the assessment of malnutrition?

A. Creatinine-height index
B. Transferrin
C. Total lymphocyte count
D. None of the above (Correct Answer)

Explanation: **Explanation:** The assessment of malnutrition involves a combination of anthropometric, biochemical, and clinical parameters. In this question, all three listed options are valid indicators used to evaluate nutritional status; therefore, **"None of the above"** is the correct choice. 1. **Creatinine-Height Index (CHI):** This is a sensitive biochemical marker for **lean body mass** and skeletal muscle depletion. Since creatinine excretion is proportional to muscle mass, a low CHI indicates protein-energy malnutrition (PEM). 2. **Transferrin:** This is a transport protein for iron. In the context of nutrition, it serves as a **biochemical marker of visceral protein status**. Because it has a shorter half-life (approx. 8 days) than albumin (approx. 20 days), it is a more sensitive indicator of recent protein depletion. 3. **Total Lymphocyte Count (TLC):** Malnutrition leads to secondary immunodeficiency. TLC is used as a surrogate marker for **immune competence**. A low TLC (<1500 cells/mm³) is often associated with increased nutritional risk and poor clinical outcomes. **High-Yield Clinical Pearls for NEET-PG:** * **Albumin vs. Pre-albumin:** While Albumin is the most common marker, **Pre-albumin (Transthyretin)** is the "Gold Standard" for monitoring acute changes in nutritional status due to its very short half-life (2 days). * **Anthropometry:** In community settings, **Mid-Upper Arm Circumference (MUAC)** is the preferred screening tool for Severe Acute Malnutrition (SAM) in children aged 6–59 months (Cut-off: <11.5 cm). * **Nitrogen Balance:** This is the most precise way to measure the adequacy of protein intake versus breakdown.

Question 336: Which element is often referred to as a "double-edged sword" in public health due to its benefits in preventing dental caries but potential for harm at higher concentrations?

A. Chlorine
B. Fluorine (Correct Answer)
C. Lead
D. Selenium

Explanation: ### Explanation **Correct Answer: B. Fluorine** Fluorine is famously known as a **"double-edged sword"** in public health because of its narrow therapeutic index. Its effects are strictly dose-dependent: 1. **The Benefit:** At optimal levels (0.5–0.8 mg/L in drinking water), it prevents dental caries by reducing the solubility of enamel in acids and promoting remineralization. 2. **The Harm:** At higher concentrations (>1.5 mg/L), it leads to **Dental Fluorosis** (mottling of enamel). At levels >3–10 mg/L, prolonged exposure causes **Skeletal Fluorosis**, characterized by increased bone density, calcification of ligaments, and "knock-knees" (Genu valgum). --- ### Why the other options are incorrect: * **A. Chlorine:** Used primarily for water disinfection. While excessive chlorine can cause taste issues or form trihalomethanes, it is not characterized by the specific "double-edged" benefit-to-toxicity ratio regarding dental health. * **C. Lead:** A pure environmental toxin with no known physiological benefit to humans. It causes plumbism, anemia, and neurotoxicity. * **D. Selenium:** While also a trace element with a narrow safety range (essential for glutathione peroxidase but toxic in excess), it is not the classic answer associated with dental caries prevention in public health terminology. --- ### NEET-PG High-Yield Pearls: * **Safe Limit:** The WHO guideline for fluoride in drinking water is **1.5 mg/L**. * **Defluoridation:** The **Nalgonda Technique** (using alum and lime) is the most common method used in India for removing excess fluoride. * **Clinical Sign:** **Mottling of teeth** is the earliest sign of dental fluorosis; it is permanent and occurs during the period of tooth formation. * **Skeletal Fluorosis:** Primarily affects the spine and small joints; "Crippling fluorosis" occurs with long-term intake of >10 mg/day.

Question 337: Poisoning of food by which of the following organisms has the shortest incubation period?

A. S. aureus (Correct Answer)
B. Salmonella
C. Botulism
D. Cl. perfringens

Explanation: The correct answer is **S. aureus**. ### **Medical Concept: Preformed Toxins vs. Infection** The incubation period of food poisoning is primarily determined by whether the illness is caused by a **preformed toxin** (intoxication) or the **growth of the organism** within the gut (infection). * **S. aureus (Correct Answer):** This is the classic example of "picnic pathology." The bacteria produce a heat-stable enterotoxin in the food *before* it is consumed. Because the toxin is already present, symptoms (nausea, projectile vomiting, and abdominal cramps) appear rapidly, typically within **1–6 hours** (average 3 hours). ### **Analysis of Incorrect Options** * **Salmonella:** This is a food-borne **infection**. The bacteria must multiply in the intestine and invade the mucosa, which takes time. The incubation period is typically **12–36 hours**. * **Cl. perfringens:** While it involves a toxin, the toxin is usually released *after* the spores are ingested and germinate in the gut. This results in an intermediate incubation period of **8–24 hours** (average 12 hours). * **Botulism (Cl. botulinum):** Although this is also an intoxication (preformed toxin), the toxin must be absorbed and travel to the neuromuscular junctions. The incubation period is usually **12–36 hours**. ### **NEET-PG High-Yield Pearls** * **Shortest Incubation:** *S. aureus* (1–6 hours) followed by *B. cereus* (emetic type: 1–5 hours). * **Key Symptom:** *S. aureus* is characterized by **violent vomiting**; fever is usually absent. * **Common Vehicle:** For *S. aureus*, it is often milk products, custards, or processed meats. * **B. cereus Dual Syndrome:** * **Emetic type:** Short incubation (1–5 hrs), associated with **fried rice**. * **Diarrheal type:** Long incubation (8–16 hrs), associated with meat/vegetables.

Question 338: Endemic ascites is associated with which of the following?

A. Pyrrolizidine (Correct Answer)
B. Aflatoxin
C. Sanguinarine
D. Beta oxalylamino alanine (BOAA)

Explanation: **Explanation:** **Endemic Ascites** (also known as Veno-Occlusive Disease or VOD) is caused by the ingestion of **Pyrrolizidine alkaloids**. These toxins are found in the seeds of plants like *Crotalaria* (Jhunjhunia), which often contaminate staple food crops like millet or mustard. 1. **Why Pyrrolizidine is correct:** When ingested, these alkaloids are metabolized in the liver to reactive pyrroles. These cause damage to the endothelial lining of the small hepatic venules, leading to obstruction, portal hypertension, and rapid accumulation of **ascites**. This condition was famously documented in the Sarguja district of Chhattisgarh, India. 2. **Why other options are incorrect:** * **Aflatoxin:** Produced by *Aspergillus flavus*, it contaminates stored grains (groundnuts, maize). It is primarily associated with **Hepatocellular Carcinoma (HCC)** and acute hepatitis, not endemic ascites. * **Sanguinarine:** This is an alkaloid found in *Argemone mexicana* (Prickly poppy) seeds. Contamination of mustard oil with Argemone oil leads to **Epidemic Dropsy**, characterized by bilateral pitting edema, cardiac failure, and glaucoma. * **Beta oxalylamino alanine (BOAA):** Also known as ODAP, this neurotoxin is found in *Lathyrus sativus* (Khesari dal). It causes **Lathyrism**, a form of spastic paraplegia. **High-Yield Clinical Pearls for NEET-PG:** * **Veno-Occlusive Disease (VOD):** Think *Crotalaria* + Pyrrolizidine. * **Epidemic Dropsy:** Think *Argemone* + Sanguinarine (Test: Nitric Acid test/Cupric sulfate test). * **Lathyrism:** Think *Lathyrus sativus* + BOAA (Prevention: Steeping or Parboiling). * **Ergotism:** Think *Claviceps purpurea* + Lysergic acid (Symptoms: St. Anthony’s Fire/Gangrene).

Question 339: Which of the following statements regarding Net Protein Utilization (NPU) is FALSE?

A. It is the increase in body weight per unit weight of protein consumed. (Correct Answer)
B. The NPU of cow's milk is 81%.
C. The NPU of average Indian foods is typically between 50% and 80%.
D. If NPU is low, a higher intake of protein is required.

Explanation: ### Explanation **1. Why Option A is the correct answer (The False Statement):** Option A describes **Protein Efficiency Ratio (PER)**, not Net Protein Utilization (NPU). PER is defined as the gain in body weight per gram of protein intake. **Net Protein Utilization (NPU)**, on the other hand, is a measure of protein quality that accounts for both digestibility and the biological value of the amino acids. It is defined as the proportion of nitrogen intake that is actually retained in the body. * **Formula:** $NPU = \frac{\text{Nitrogen Retained}}{\text{Nitrogen Intake}} \times 100$ (or $NPU = \text{Biological Value} \times \text{Digestibility Coefficient}$). **2. Analysis of Incorrect Options (True Statements):** * **Option B:** The NPU of **cow’s milk is indeed 81%**. For comparison, Egg (the reference protein) has an NPU of 96-100%, and Meat is approximately 80%. * **Option C:** The NPU of **average Indian diets** (predominantly cereal-based) typically ranges between **50% and 80%**, often averaging around 65%. * **Option D:** Because NPU measures how much protein is actually utilized, if the NPU is low (poor quality), a person must consume a **higher total quantity** of that protein to meet their physiological nitrogen requirements. **3. High-Yield NEET-PG Pearls:** * **Reference Protein:** Egg is considered the "Standard/Reference Protein" because of its high NPU (96) and Biological Value (94). * **Limiting Amino Acids:** Indian diets are often deficient in specific amino acids (e.g., Pulses are low in Methionine; Cereals are low in Lysine). * **Net Dietary Protein Calories % (NDpCal%):** This is a more comprehensive measure used to assess if a diet provides enough protein relative to total energy. For an average adult, an NDpCal% of **5%** is considered adequate.

Question 340: Regular consumption of which of the following fruit juices is known to help prevent Urinary Tract Infections (UTI)?

A. Raspberry juice
B. Grape juice
C. Cranberry juice (Correct Answer)
D. Orange juice

Explanation: **Explanation:** The correct answer is **Cranberry juice**. **Mechanism of Action:** Cranberry juice contains high concentrations of **Proanthocyanidins (PACs)**, specifically Type-A proanthocyanidins. These compounds prevent Urinary Tract Infections (UTIs) by inhibiting the **adhesion** of P-fimbriated *Escherichia coli* (the most common uropathogen) to the uroepithelial cells lining the bladder wall. By preventing bacterial attachment, the pathogens are flushed out during micturition rather than colonizing the urinary tract. Additionally, cranberries contain **D-mannose**, which further inhibits bacterial binding. **Analysis of Incorrect Options:** * **A. Raspberry juice:** While raspberries contain antioxidants and Vitamin C, they do not possess the specific Type-A proanthocyanidins required to inhibit uropathogenic bacterial adhesion. * **B. Grape juice:** Grapes contain Type-B proanthocyanidins. Research indicates that only Type-A (found in cranberries) is effective at preventing the attachment of *E. coli* to the bladder wall. * **D. Orange juice:** Although orange juice acidifies the urine due to its Vitamin C content (which can be bacteriostatic), it lacks the specific anti-adhesion properties found in cranberries and is not considered a primary preventive measure for recurrent UTIs. **High-Yield Clinical Pearls for NEET-PG:** * **Prophylaxis vs. Treatment:** Cranberry juice is effective for the **prevention** (prophylaxis) of recurrent UTIs, particularly in women, but it is **not** an effective treatment for an active, established infection. * **Uropathogen:** *E. coli* is responsible for approximately 80-90% of community-acquired UTIs. * **Drug Interaction:** Patients on **Warfarin** should be cautious with heavy cranberry juice consumption as it may enhance the anticoagulant effect (increasing INR) due to inhibition of cytochrome P450 enzymes.

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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