Nutrition and Health Practice Questions

Q: Which food group contains the highest amount of iron?

Meat. **Explanation:** The correct answer is **Meat** because of the concept of **Bioavailability**. In nutrition, iron is classified into two types: **Heme iron** (found in animal sources) and **Non-heme iron** (found in plant sources). 1. **Why Meat is Correct:** Animal tissues (red meat, liver, organ meats) contain Heme iron, which has an absorption rate of **15–35%**. This is significantly higher than the absorption rate of non-heme iron (2–10%). Therefore, even if a plant source has a higher absolute milligram count, meat provides the highest amount of *utilizable* iron to the body. 2. **Why others are incorrect:** * **Milk:** It is notoriously poor in iron. In fact, milk is considered a **"poor source"** of both Iron and Vitamin C. * **Spinach:** While spinach contains iron, it is non-heme iron. Furthermore, spinach is rich in **oxalates and phytates**, which act as inhibitors and further decrease iron absorption. * **Jaggery:** It is a good source of iron (often due to processing in iron vessels), but it is non-heme and lacks the superior bioavailability of meat. **High-Yield NEET-PG Pearls:** * **Enhancers of Iron Absorption:** Vitamin C (Ascorbic acid) and "Meat Factor." * **Inhibitors of Iron Absorption:** Phosphates, Phytates, Oxalates, Tannins (Tea/Coffee), and Calcium. * **Richest Source:** Among animal sources, **Liver** is the richest source of iron. Among plant sources, **Pistachios** and certain green leafy vegetables (like Amaranth) are high, but bioavailability remains the limiting factor. * **Daily Requirement:** An average adult male requires ~17 mg/day, while a pregnant woman requires ~35 mg/day (as per latest ICMR-NIN guidelines).

Q: What is the net protein utilization of rice?

63%. **Explanation:** **Net Protein Utilization (NPU)** is a key indicator of protein quality, representing the proportion of dietary protein that is actually retained by the body. It is calculated as: *NPU = (Biological Value × Digestibility Coefficient) / 100.* **1. Why 63% is Correct:** Rice has an NPU of approximately **63%**. While rice is not high in total protein quantity (approx. 7%), the **quality** of its protein is the highest among all cereals. This is because rice protein has a better balance of essential amino acids compared to wheat or maize. **2. Analysis of Incorrect Options:** * **20% (Option A):** This value is too low for any common food source. Even poor-quality proteins generally have an NPU above 30-40%. * **40% (Option B):** This is closer to the NPU of certain pulses or lower-quality vegetable proteins when consumed in isolation, but it underestimates rice. * **81% (Option D):** This is the NPU for **Milk**. Animal proteins (except gelatin) generally have much higher NPU values than plant proteins. For comparison, **Egg** (the reference protein) has an NPU of **94%**, and **Meat** is approximately **75-80%**. **High-Yield NEET-PG Pearls:** * **Reference Protein:** Egg is considered the "standard" or reference protein due to its high biological value (100) and NPU (94). * **Limiting Amino Acid:** Rice is deficient in **Lysine** (like most cereals) but is relatively rich in sulfur-containing amino acids (Methionine/Cysteine). * **Pulse-Cereal Mix:** The NPU of a diet improves when cereals and pulses are eaten together (ratio 4:1) because they complement each other's limiting amino acids (Lysine and Methionine). * **NPU of Wheat:** Approximately **49%** (significantly lower than rice).

Q: What is the recommended daily dose of vitamin A for a child aged 6-12 months?

300 micrograms. The correct answer is **300 micrograms (Option C)**. ### **Explanation** The recommended dietary allowance (RDA) for Vitamin A is based on the physiological needs for growth, immune function, and vision. According to the **ICMR-NIN (2020) guidelines**, the RDA for infants aged **6–12 months is 300 μg/day** of Retinol. This requirement is slightly higher than that of infants aged 0–6 months (350 μg/day in older guidelines, but currently harmonized around 300-350 μg depending on the source) to support rapid physical development and the transition to complementary feeding. ### **Analysis of Incorrect Options** * **Option A (500 μg):** This is the RDA for children aged 4–6 years. * **Option B (200 μg):** This value is below the minimum requirement for infants in this age group and would put them at risk for deficiency. * **Option D (700 μg):** This is the RDA for adolescent boys (13–15 years) and adult men. ### **NEET-PG High-Yield Pearls** 1. **Prophylactic Schedule (National Vitamin A Prophylaxis Program):** * **1st Dose:** 1 lakh IU (at 9 months with Measles/MR vaccine). * **2nd to 9th Dose:** 2 lakh IU every 6 months until 5 years of age. * **Total Doses:** 9 doses; **Total Amount:** 17 lakh IU. 2. **Treatment of Xerophthalmia:** If a child presents with clinical signs (e.g., Bitot's spots), give three doses: Day 0, Day 1, and Day 14. 3. **Storage:** Vitamin A is a fat-soluble vitamin stored in the **Ito cells (Stellate cells)** of the liver. 4. **Earliest Sign:** The earliest clinical sign of Vitamin A deficiency is **Conjunctival Xerosis**, while the earliest symptom is **Night Blindness (Nyctalopia)**.

Q: What is the most sensitive test for the detection of argemone oil?

Paper chromatography. **Explanation:** **Argemone oil** is a common adulterant found in mustard oil, derived from the seeds of *Argemone mexicana*. Its toxicity is primarily due to the alkaloid **Sanguinarine**, which interferes with cellular oxidation and leads to **Epidemic Dropsy** (characterized by bilateral pitting edema, cardiac failure, and glaucoma). 1. **Why Paper Chromatography is correct:** Paper chromatography (and Thin Layer Chromatography) is the **most sensitive** and specific method for detecting argemone oil. It can detect contamination at levels as low as **0.0001%**. It works by separating the toxic alkaloids (Sanguinarine and Dihydrosanguinarine) from the oil, allowing for precise identification even in trace amounts. 2. **Analysis of Incorrect Options:** * **Nitric Acid Test:** This is the standard **screening test** used in field settings. When concentrated nitric acid is added to contaminated oil, a brownish-red/orange-red color develops. However, it is only sensitive down to **0.25%** concentration, making it far less sensitive than chromatography. * **Phosphatase Test:** This test is used to determine the efficiency of **pasteurization in milk**, not for detecting adulterants in oil. * **Methylene Blue Test:** This is used to test the viability of cells or as a stain in microbiology; it has no role in argemone oil detection. **High-Yield Clinical Pearls for NEET-PG:** * **Toxic Principle:** Sanguinarine (inhibits Na+-K+ ATPase). * **Clinical Presentation:** "Epidemic Dropsy" – triad of edema, cardiac failure, and **Glaucoma** (specifically open-angle). * **Screening vs. Confirmatory:** Nitric acid test is for screening; Chromatography is for confirmation/sensitivity. * **Cupric Sulfate Test:** Another chemical test for argemone oil, but less commonly asked than Nitric Acid.

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

To make enamel harder than usual. **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.

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

Approximately 150 mg of Cholesterol. 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).

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

Broca's Index. **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**.

Q: 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?

6%. **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**.

Q: All of the following are true regarding dietary fibers EXCEPT:

Increases stool transit time. **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 1

Which food group contains the highest amount of iron?

Accepted Answer

Meat

Answer

Milk

Answer

Spinach

Answer

Jaggery

Question 2

What is the net protein utilization of rice?

Accepted Answer

63%

Answer

20%

Answer

40%

Answer

81%

Question 3

What is the recommended daily dose of vitamin A for a child aged 6-12 months?

Accepted Answer

300 micrograms

Answer

500 micrograms

Answer

200 micrograms

Answer

700 micrograms

Question 4

"French paradox" refers to which of the following observations?

Accepted Answer

A population in France with a high intake of wine and a diet rich in fat, yet exhibiting a low incidence of obesity and cardiovascular disease.

Answer

A population in France with a high rate of smoking but a lower incidence of bronchogenic carcinoma.

Answer

A physically active population in France with a high incidence of cardiovascular disease.

Answer

A population in France with a high sugar intake and a high incidence of obesity and type 2 diabetes mellitus.

Question 5

What is the most sensitive test for the detection of argemone oil?

Accepted Answer

Paper chromatography

Answer

Nitric acid test

Answer

Phosphatase test

Answer

Methylene blue test

Question 6

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

Accepted Answer

To make enamel harder than usual

Answer

To replace several hydroxyl ions in hydroxyapatite

Answer

To make enamel several times less soluble

Answer

To promote deposition of calcium phosphate to 'heal' pits in enamel surface

Question 7

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

Accepted Answer

Approximately 150 mg of Cholesterol

Answer

Approximately 6 grams of protein

Answer

Approximately 6 grams of fat

Answer

Approximately 1.5 mg of Iron

Question 8

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

Accepted Answer

Broca's Index

Answer

BMI

Answer

Ponderal Index

Answer

Corpulence Index

Question 9

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?

Accepted Answer

6%

Answer

5%

Answer

8%

Answer

10%

Question 10

All of the following are true regarding dietary fibers EXCEPT:

Accepted Answer

Increases stool transit time

Answer

Binds to bile salts and reduces their reabsorption

Answer

Inhibits faecal mutagen synthesis

Answer

Reduces postprandial glucose levels

Nutrition and Health — MCQs

Nutrition and Health — MCQs

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