Nutrition and Health — MCQs

Nutrition and Health Indian Medical PG Practice Questions and MCQs

Question 491: Lathyrism is due to which of the following?

A. Khesari dal (Correct Answer)
B. Aflatoxins
C. Aspergillus
D. Fluoride

Explanation: **Explanation:** **Lathyrism** is a form of permanent spastic paralysis caused by the excessive consumption of **Khesari dal (*Lathyrus sativus*)**. This pulse contains a potent neurotoxin known as **BOAA (Beta-oxalyl-amino-alanine)**, also referred to as ODAP. The toxin causes oxidative stress and damage to the upper motor neurons, leading to a crippling neurological condition characterized by a "scissor gait." **Analysis of Options:** * **A. Khesari dal (Correct):** It is the primary source of the BOAA toxin. Lathyrism is endemic in parts of Central India where this hardy crop is consumed as a staple during droughts. * **B & C. Aflatoxins/Aspergillus (Incorrect):** Aflatoxins are produced by the fungus *Aspergillus flavus*, which typically contaminates stored food grains like groundnuts and maize. Chronic exposure is linked to **Hepatocellular Carcinoma**, not lathyrism. * **D. Fluoride (Incorrect):** Excess fluoride intake leads to **Fluorosis**, affecting teeth (mottling) and the skeletal system (calcification of ligaments and "knock-knees"), but it does not cause spastic paralysis. **High-Yield Clinical Pearls for NEET-PG:** 1. **Stages of Lathyrism:** Non-stick stage $\rightarrow$ Stick stage $\rightarrow$ Two-stick stage $\rightarrow$ Crawler stage. 2. **Prevention:** Lathyrism can be prevented by **steeping** (soaking in hot water) or **parboiling** the pulses, which leaches out the water-soluble BOAA toxin. 3. **Epidemiology:** It predominantly affects young adult males (15–45 years) due to higher consumption levels. 4. **Safe Limit:** Khesari dal is considered safe if it constitutes less than 30% of the total calorie intake.

Question 492: Corpulence index is a measure of:

A. Copper level in the serum
B. Iron loss in faeces
C. Obesity (Correct Answer)
D. Income inequality

Explanation: **Explanation:** The **Corpulence Index (CI)**, also known as the **Ponderal Index (PI)** or Rohrer's Index, is a measure of leanness or "corpulence" (obesity) of a person. It is calculated using the formula: **CI = Mass (kg) / Height³ (m³)** While the Body Mass Index (BMI) uses height squared, the Corpulence Index uses height cubed, making it a more accurate indicator of body composition in individuals who are very short or very tall, and it is frequently used in pediatrics to assess neonatal growth status (SGA vs. LGA). **Analysis of Options:** * **Option A (Copper level):** This is incorrect. Copper levels are measured via serum ceruloplasmin or 24-hour urinary copper (relevant in Wilson’s Disease), not by an "index" of this name. * **Option B (Iron loss):** This is incorrect. Iron loss is typically assessed through radioisotope studies or calculated based on clinical blood loss; it has no relation to the Corpulence Index. * **Option D (Income inequality):** This is incorrect. The standard measure for income inequality in public health and economics is the **Gini Coefficient** or the **Lorenz Curve**. **High-Yield Pearls for NEET-PG:** 1. **Quetelet’s Index:** Another name for **BMI** (Weight/Height²). 2. **Broca’s Index:** Used for ideal body weight calculation (Height in cm – 100). 3. **Ponderal Index (CI):** Especially useful in assessing **intrauterine growth restriction (IUGR)**; a low PI indicates "asymmetrical" IUGR. 4. **Waist-Hip Ratio:** A measure of central (android) obesity; significant risk if >0.9 in men and >0.85 in women.

Question 493: Beri-beri is caused by a deficiency of which vitamin?

A. Thiamine (Correct Answer)
B. Folic acid
C. Riboflavin
D. Niacin

Explanation: **Explanation:** **Beri-beri** is the clinical manifestation of **Thiamine (Vitamin B1)** deficiency. Thiamine acts as a crucial co-enzyme (Thiamine Pyrophosphate - TPP) in carbohydrate metabolism, specifically in the decarboxylation of pyruvic acid. When deficient, pyruvic acid accumulates in the blood, leading to neurological and cardiovascular impairment. * **Dry Beri-beri:** Characterized by peripheral neuropathy (wrist drop/foot drop) and muscle wasting. * **Wet Beri-beri:** Characterized by high-output cardiac failure and edema. * **Wernicke-Korsakoff Syndrome:** An acute/chronic brain syndrome often seen in alcoholics due to thiamine deficiency. **Why other options are incorrect:** * **Folic Acid (B9):** Deficiency leads to **Megaloblastic anemia** and Neural Tube Defects (NTDs) in fetuses. * **Riboflavin (B2):** Deficiency causes **Ariboflavinosis**, characterized by angular stomatitis, cheilosis, and glossitis (magenta tongue). * **Niacin (B3):** Deficiency leads to **Pellagra**, classically identified by the "4 Ds": Dermatitis (Casal’s necklace), Diarrhea, Dementia, and Death. **High-Yield Clinical Pearls for NEET-PG:** * **Infantile Beri-beri:** Occurs in infants (2–4 months) breastfed by thiamine-deficient mothers; presents with "aphonic cry" and cardiac failure. * **Milling of Rice:** Polishing rice removes the pericarp (outer layer) which is rich in Thiamine, making polished rice eaters highly susceptible to Beri-beri. * **Staple Diet:** Beri-beri is historically associated with populations consuming **polished/white rice**, while Pellagra is associated with **Maize/Jowar** diets.

Question 494: Severe malnutrition is defined in adults with BMI less than what value?

A. 18.5
B. 16 (Correct Answer)
C. 13
D. 11

Explanation: **Explanation:** In Community Medicine and Clinical Nutrition, the classification of nutritional status in adults is primarily based on the **Body Mass Index (BMI)**, calculated as weight in kilograms divided by the square of height in meters ($kg/m^2$). According to the World Health Organization (WHO) criteria, a BMI below 18.5 indicates underweight status. This category is further subdivided to define the severity of Chronic Energy Deficiency (CED): * **BMI 17.0 – 18.49:** Mild Malnutrition (Grade I CED) * **BMI 16.0 – 16.99:** Moderate Malnutrition (Grade II CED) * **BMI < 16.0:** **Severe Malnutrition (Grade III CED)** **Analysis of Options:** * **Option A (18.5):** This is the threshold for "Underweight." Anyone below this value is malnourished, but it does not represent the "severe" category. * **Option B (16):** Correct. A BMI of less than 16 is the internationally recognized cutoff for severe thinness or severe malnutrition in adults. * **Option C & D (13 and 11):** These values represent extreme, life-threatening emaciation often seen in end-stage famine or advanced anorexia nervosa, but they are not the formal diagnostic cutoffs for the "severe" classification. **High-Yield Clinical Pearls for NEET-PG:** * **Normal BMI Range:** 18.5 – 24.9 $kg/m^2$. * **Overweight:** $\geq 25$ $kg/m^2$; **Obese:** $\geq 30$ $kg/m^2$. * **Asian-Indian Criteria:** Due to higher visceral fat at lower BMIs, the revised criteria for Indians define Overweight as **23 – 24.9** and Obesity as **$\geq 25$**. * **Mid-Upper Arm Circumference (MUAC):** While BMI is used for adults, MUAC is the screening tool of choice for malnutrition in children aged 6–59 months (Severe Acute Malnutrition is defined as MUAC < 11.5 cm).

Question 495: What is responsible for epidemic dropsy?

A. Sanguinarine (Correct Answer)
B. Ergot alkaloids
C. Pyrazolidine alkaloids
D. Aflatoxin

Explanation: **Explanation:** **Epidemic Dropsy** is a clinical condition caused by the consumption of mustard oil contaminated with **Argemone mexicana** (prickly poppy) seeds. The seeds contain the toxic alkaloid **Sanguinarine**, which interferes with the oxidation of pyruvic acid, leading to the accumulation of pyruvates in the blood. This causes extensive capillary dilatation and increased permeability, resulting in the characteristic clinical triad of bilateral pitting edema, cardiac failure, and secondary glaucoma. **Analysis of Options:** * **A. Sanguinarine (Correct):** It is the primary toxin in Argemone oil responsible for the pathogenesis of epidemic dropsy. * **B. Ergot alkaloids:** These are produced by the fungus *Claviceps purpurea* infecting food grains like Bajra. Ingestion leads to **Ergotism**, characterized by vomiting, giddiness, and gangrene of fingers/toes. * **C. Pyrazolidine alkaloids:** Found in *Crotalaria* seeds (Jhunjhunia) which contaminate pulses. These toxins cause **Veno-Occlusive Disease (VOD)** of the liver. * **D. Aflatoxin:** Produced by the fungus *Aspergillus flavus* contaminating stored grains (groundnuts, maize). Chronic exposure is a major risk factor for **Hepatocellular Carcinoma**. **High-Yield Clinical Pearls for NEET-PG:** 1. **Nitric Oxide Link:** Sanguinarine increases Nitric Oxide levels, contributing to massive vasodilatation. 2. **Diagnostic Test:** The **Nitric Acid Test** (gives a crimson-orange color) and Paper Chromatography are used to detect Argemone oil in mustard oil. 3. **Key Clinical Feature:** Sudden onset of non-inflammatory, bilateral pitting edema of legs, often associated with diarrhea and cutaneous erythema. 4. **Lathyrism vs. Dropsy:** Do not confuse this with Lathyrism, which is caused by *Lathyrus sativus* (Khesari Dal) containing the neurotoxin **BOAA**.

Question 496: Which of the following methods can be used for the assessment of malnutrition?

A. Mid-arm circumference (MAC)
B. Body mass index
C. Weight for age
D. All of the above (Correct Answer)

Explanation: The assessment of malnutrition involves various anthropometric measurements that evaluate different aspects of nutritional status, including acute wasting, chronic stunting, and overall energy balance. **Explanation of the Correct Answer:** The correct answer is **D (All of the above)** because malnutrition is a broad term encompassing both undernutrition and overnutrition. Each listed method serves as a validated tool for assessment: * **Mid-arm circumference (MAC):** This is a proxy for muscle mass and subcutaneous fat. It is particularly useful for rapid screening of **acute malnutrition** in children aged 6–59 months. A MAC <11.5 cm indicates Severe Acute Malnutrition (SAM). * **Body Mass Index (BMI):** Calculated as weight (kg)/height (m²), it is the gold standard for assessing nutritional status in **adults**. It identifies both chronic energy deficiency (BMI <18.5) and obesity (BMI >25 or 30). * **Weight for Age:** This is the primary parameter used in the **Gomez classification** and the **ICDS growth charts (Road to Health Chart)** to detect "underweight" status in children. **Why individual options are not the "only" answer:** While A, B, and C are all correct, selecting any single one would be incomplete. In clinical practice and public health surveys, these tools are used complementarily depending on the target age group and the specific type of malnutrition (acute vs. chronic) being screened. **High-Yield Clinical Pearls for NEET-PG:** * **Best indicator of Acute Malnutrition (Wasting):** Weight-for-height. * **Best indicator of Chronic Malnutrition (Stunting):** Height-for-age. * **Quac Stick:** A field tool used to measure MAC-for-height. * **Shakir’s Tape:** A tri-colored tape used to measure MAC (Green: Normal; Yellow: Borderline; Red: Severe Malnutrition). * **Ponderal Index:** Used primarily in neonates to assess intrauterine growth retardation (IUGR).

Question 497: Which food item has the maximum cholesterol content?

A. Eggs (Correct Answer)
B. Coconut oil
C. Hydrogenated fats
D. Ghee

Explanation: **Explanation:** The core medical concept here is the distinction between **animal-derived** and **plant-derived** fats. Cholesterol is a sterol synthesized exclusively by animal tissues. Therefore, it is found only in foods of animal origin. **1. Why Eggs are correct:** Among common food items, eggs (specifically the yolk) have the highest concentration of cholesterol. One whole egg contains approximately **200–250 mg** of cholesterol. In medical nutrition, the egg is often used as the "gold standard" for protein quality (Biological Value of 100), but it is also the most concentrated source of dietary cholesterol. **2. Why the other options are incorrect:** * **Coconut Oil (B):** This is a plant-derived fat. While it is very high in **saturated fatty acids**, it contains **zero cholesterol**. * **Hydrogenated Fats (C):** These are vegetable oils (like vanaspati) processed to become solid. They are high in **Trans-fatty acids**, which raise LDL (bad cholesterol) in the blood, but the product itself does not contain dietary cholesterol. * **Ghee (D):** While ghee is an animal product and does contain cholesterol (approx. 300 mg per 100g), the concentration per serving is significantly lower than that found in an egg yolk. **Clinical Pearls for NEET-PG:** * **Exogenous vs. Endogenous:** Only about 25% of body cholesterol comes from diet; 75% is synthesized endogenously by the liver. * **Plant Sterols:** Plants contain "Phytosterols" (like sitosterol), which actually compete with cholesterol for absorption and can help lower blood cholesterol levels. * **Daily Limit:** Traditional guidelines recommended limiting intake to <300 mg/day, though recent focus has shifted more toward limiting trans-fats and saturated fats.

Question 498: What is the WHO recommended daily salt intake?

A. Less than 5 grams per day (Correct Answer)
B. Less than 6 grams per day
C. Less than 7 grams per day
D. Less than 8 grams per day

Explanation: **Explanation:** The World Health Organization (WHO) recommends that adults consume **less than 5 grams of salt per day** (equivalent to approximately one teaspoon). This recommendation is a critical public health strategy aimed at reducing the global burden of non-communicable diseases (NCDs). **Why Option A is Correct:** The physiological requirement for sodium is relatively low. High salt intake is directly linked to elevated blood pressure (hypertension), which is a major risk factor for cardiovascular diseases, stroke, and coronary heart disease. Restricting intake to <5g/day (which provides roughly **2 grams of sodium**) helps maintain healthy blood pressure levels and reduces the risk of gastric cancer and kidney disease. **Why Options B, C, and D are Incorrect:** While various national guidelines previously suggested higher limits (e.g., 6g/day was a common historical target in some regions), the WHO standardized the global recommendation to <5g/day to achieve maximum protective benefits for heart health. Options B, C, and D exceed the current evidence-based threshold for preventing hypertension. **High-Yield Clinical Pearls for NEET-PG:** * **Sodium vs. Salt:** Remember the conversion: **5g of Salt ≈ 2g of Sodium**. If a question asks for the sodium limit, the answer is <2g. * **Potassium Intake:** To counteract the effects of sodium, the WHO also recommends increasing potassium intake from food to at least **3.5 grams (3510 mg) per day** for adults. * **Iodization:** In India, under the PFA Act, salt must be fortified with iodine (30 ppm at production level; 15 ppm at consumer level). * **Target:** The WHO global target is to reduce the mean population intake of salt by **30% by 2025**.

Question 499: An individual is said to be 'overweight' if their Body Mass Index (BMI) is in which range?

A. 24.0 - 26.9
B. 24.0 - 27.9
C. 25.0 - 28.9
D. 25.0 - 29.9 (Correct Answer)

Explanation: **Explanation:** The classification of nutritional status using **Body Mass Index (BMI)**—calculated as weight in kilograms divided by the square of height in meters ($kg/m^2$)—is a fundamental concept in public health. According to the **World Health Organization (WHO)** international classification, an individual is categorized as **'Overweight'** when their BMI is between **25.0 and 29.9 $kg/m^2$**. * **Why Option D is Correct:** This range represents the pre-obesity stage where there is an excess of body weight relative to height, increasing the risk of non-communicable diseases (NCDs) before reaching the threshold for 'Obesity' ($\ge 30.0$). * **Why Options A, B, and C are Incorrect:** These ranges do not align with the standardized WHO criteria. Option A and B use 24.0 as a starting point, whereas the 'Normal' range extends up to 24.9. Option C uses 28.9 as an upper limit, which is an arbitrary cutoff not recognized in global clinical guidelines. **High-Yield Clinical Pearls for NEET-PG:** 1. **WHO Classification (Global):** * Underweight: $< 18.5$ * Normal: $18.5 – 24.9$ * Overweight: $25.0 – 29.9$ * Obesity: $\ge 30.0$ (Class I: 30–34.9; Class II: 35–39.9; Class III: $\ge 40$) 2. **Asia-Pacific (Indian) Guidelines:** Due to higher visceral fat at lower BMIs, the cutoffs for Indians are lower: * **Overweight:** $23.0 – 24.9$ * **Obesity:** $\ge 25.0$ 3. **Ponderal Index:** A similar measure used in pediatrics, calculated as $Weight (kg) / Height (m)^3$.

Question 500: Which of the following is NOT a milk-borne disease?

A. Salmonellosis
B. E. coli infection (Correct Answer)
C. Streptococcal infection
D. Tuberculosis

Explanation: ### Explanation The correct answer is **B. E. coli infection**. **1. Why E. coli is the correct answer:** In the context of standard Community Medicine textbooks (like Park’s Preventive and Social Medicine), diseases are classified based on their primary mode of transmission. **Milk-borne diseases** are those where milk acts as a vehicle for pathogens derived from the animal (zoonoses) or contaminated during handling. While *E. coli* can contaminate milk via fecal matter, it is primarily classified as a **water-borne** or **food-borne** pathogen (associated with the feco-oral route) rather than a classic milk-borne disease in standard epidemiological classifications. **2. Analysis of Incorrect Options:** * **Salmonellosis (Option A):** This is a classic milk-borne disease. *Salmonella* species can contaminate milk through the cow’s feces or via infected handlers, leading to outbreaks of food poisoning. * **Streptococcal infection (Option C):** Milk can be contaminated with *Streptococcus pyogenes* from the udders of cows (mastitis) or from the throats of dairy workers, leading to outbreaks of septic sore throat or scarlet fever. * **Tuberculosis (Option D):** *Mycobacterium bovis* is a major milk-borne pathogen. It is transmitted from infected cattle to humans via raw milk, causing extra-pulmonary tuberculosis (commonly abdominal TB). **3. Clinical Pearls & High-Yield Facts for NEET-PG:** * **Classification of Milk-borne Diseases:** * **From the Animal:** Tuberculosis (*M. bovis*), Brucellosis (undulant fever), Anthrax, Q-fever (*Coxiella burnetii*), and Foot and Mouth disease. * **From Human Handling:** Typhoid/Paratyphoid, Cholera, Shigellosis, Staphylococcal food poisoning, and Streptococcal infections. * **Q-Fever:** *Coxiella burnetii* is the most heat-resistant pathogen found in milk; therefore, it is used as the indicator organism to set the temperature and time standards for **Pasteurization**. * **Phosphatase Test:** Used to check the efficiency of pasteurization. It works on the principle that the enzyme phosphatase, naturally present in raw milk, is destroyed at temperatures slightly higher than those required to kill the most resistant milk-borne pathogens.

Practice by Chapter

Basic Nutritional Requirements

Practice Questions

Assessment of Nutritional Status

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Protein-Energy Malnutrition

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Micronutrient Deficiencies

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Nutritional Programs in India

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Dietary Guidelines

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Food Safety and Security

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Diet and Non-Communicable Diseases

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Nutrition in Pregnancy and Lactation

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Infant and Young Child Nutrition

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Nutrition in Emergencies

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Food Fortification and Supplementation

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