Nutrition and Health — MCQs

Nutrition and Health Indian Medical PG Practice Questions and MCQs

Question 481: Which anthropometric measure of malnutrition is independent of age?

A. Weight/Height
B. Mid-arm circumference (Correct Answer)
C. Head circumference
D. Mid-arm circumference/height

Explanation: ### Explanation **Correct Answer: B. Mid-arm circumference (MUAC)** **Why it is correct:** Mid-upper arm circumference (MUAC) is a reliable indicator of muscle mass and subcutaneous fat. In children, the MUAC remains relatively constant (approximately **15 cm to 17 cm**) between the ages of **1 to 5 years**. Because the growth of the arm is minimal during this specific window, the measurement is considered **independent of age**. It is a rapid, low-cost screening tool used in community settings to identify Severe Acute Malnutrition (SAM). A MUAC of **<11.5 cm** indicates severe malnutrition. **Why the other options are incorrect:** * **A. Weight/Height:** This is an indicator of "wasting" (acute malnutrition). While it relates weight to the child's current stature, it is not strictly age-independent in the same way MUAC is, as both parameters change significantly as a child grows. * **C. Head circumference:** This is highly dependent on age, especially during the first two years of life when brain growth is most rapid. It is used to monitor neurodevelopment rather than nutritional status. * **D. Mid-arm circumference/height (Quac Stick):** While this ratio is used to assess nutritional status, the question asks for a specific "measure." MUAC itself is the classic, high-yield answer for an age-independent parameter in the 1–5 year age group. **High-Yield Clinical Pearls for NEET-PG:** * **Shakir’s Tape:** Used to measure MUAC. Colors: Red (<12.5 cm - Malnourished), Yellow (12.5–13.5 cm - Borderline), Green (>13.5 cm - Normal). *Note: WHO updated cut-offs now use <11.5 cm for SAM.* * **Stunting:** Low Height-for-Age (indicates chronic malnutrition). * **Wasting:** Low Weight-for-Height (indicates acute malnutrition). * **Underweight:** Low Weight-for-Age (composite indicator). * **Best indicator of growth:** Weight-for-age (monitored via Growth Charts/Road to Health cards).

Question 482: Which index best represents the duration of malnutrition?

A. Weight for height
B. Height for age (Correct Answer)
C. Weight for age
D. None of the above

Explanation: In pediatric nutrition assessment, different anthropometric indices reflect different timelines of nutritional insult. **Why "Height for Age" is the correct answer:** Height for age is the primary indicator of **chronic malnutrition**. Linear growth (height) is a slow process; therefore, a deficit in height for age (known as **Stunting**) signifies a long-term, cumulative nutritional deficiency or recurrent infections. It reflects the "duration" of malnutrition because it takes a significant amount of time for a child’s height to fall below the expected percentile for their age. **Analysis of incorrect options:** * **Weight for Height:** This index measures **Wasting**. It reflects **acute malnutrition** (recent weight loss or failure to gain weight). It is the best indicator of current nutritional status and is used to identify children at immediate risk of mortality in emergencies. * **Weight for Age:** This index measures **Underweight**. It is a composite indicator that does not distinguish between acute (wasting) and chronic (stunting) malnutrition. While useful for routine growth monitoring (e.g., ICDS growth charts), it is not a specific measure of duration. **High-Yield Clinical Pearls for NEET-PG:** * **Stunting:** Low Height-for-Age (Chronic/Duration). * **Wasting:** Low Weight-for-Height (Acute/Severity). * **Underweight:** Low Weight-for-Age (Composite/Growth monitoring). * **Waterlow’s Classification:** Uses Weight-for-Height to classify wasting and Height-for-Age to classify stunting. * **Gomez Classification:** Historically used Weight-for-Age to classify malnutrition. * **Mid-Upper Arm Circumference (MUAC):** Best field tool for rapid screening of acute malnutrition in children aged 6–59 months (Cut-off <11.5 cm for SAM).

Question 483: Epidemic dropsy results from?

A. Dhatura poisoning
B. Argemone poisoning (Correct Answer)
C. Aluminum phosphide poisoning
D. Organophosphorus poisoning

Explanation: **Explanation:** **Epidemic Dropsy** is a clinical condition caused by the ingestion of mustard oil contaminated with **Argemone mexicana** (prickly poppy) seeds. These seeds contain a toxic alkaloid called **Sanguinarine**. 1. **Why Argemone poisoning is correct:** Sanguinarine interferes with the oxidation of pyruvic acid, leading to its accumulation in the blood. This results in extensive capillary dilatation and increased permeability, causing leakage of fluid into tissues. Clinically, this manifests as sudden bilateral pitting edema of the lower limbs (dropsy), gastrointestinal disturbances, and potentially fatal cardiac failure or glaucoma. 2. **Why other options are incorrect:** * **Dhatura poisoning:** Caused by alkaloids like atropine and hyoscine. It presents with the "classical five Ds": Dryness of mouth, Dysphagia, Dilated pupils, Delirium, and Death. It does not cause edema. * **Aluminum phosphide poisoning:** A common suicidal agent (Celphos) that releases phosphine gas. It causes severe metabolic acidosis and multi-organ failure, but not epidemic dropsy. * **Organophosphorus poisoning:** Inhibits acetylcholinesterase, leading to a cholinergic crisis (miosis, salivation, lacrimation, bradycardia). **High-Yield NEET-PG Pearls:** * **Toxic Agent:** Sanguinarine (alkaloid) and Dihydrosanguinarine. * **Diagnostic Test:** **Nitric Acid Test** (gives a brownish-red color) or Paper Chromatography. * **Key Clinical Sign:** Bilateral pitting edema + Erythema of skin + Glaucoma (due to increased capillary pressure in the eye). * **Adulteration:** Often occurs because Argemone seeds resemble mustard seeds and bloom at the same time.

Question 484: Which test is the most effective for assessing the efficiency of pasteurization?

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

Explanation: **Explanation:** **Phosphatase Test (Correct Answer):** The phosphatase test is the gold standard for assessing the efficiency of pasteurization. It is based on the principle that the enzyme **Alkaline Phosphatase (ALP)** is naturally present in raw milk and has a heat-resistance profile slightly higher than that of the most heat-resistant non-spore-forming pathogen, *Coxiella burnetii*. * **Mechanism:** If pasteurization is performed correctly (e.g., 63°C for 30 mins or 72°C for 15 secs), the ALP enzyme is completely inactivated. * **Significance:** A negative phosphatase test indicates successful pasteurization. A positive test suggests either inadequate heating or the post-pasteurization addition of raw milk. **Incorrect Options:** * **Oxidase Test:** Used in microbiology to identify bacteria that produce cytochrome c oxidase (e.g., *Pseudomonas*, *Neisseria*). It has no role in milk quality control. * **Catalase Test:** Used to differentiate *Staphylococci* (positive) from *Streptococci* (negative). While raw milk contains catalase, it is not a reliable indicator of pasteurization efficiency. * **Indole Test:** A biochemical test used to determine the ability of an organism to split indole from the amino acid tryptophan (e.g., *E. coli*). **High-Yield NEET-PG Pearls:** * **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. * **Target Organism:** *Coxiella burnetii* (causative agent of Q fever) is the most heat-resistant pathogen found in milk; pasteurization is designed specifically to kill it. * **Coliform Count:** While the phosphatase test checks for *efficiency*, the Coliform count is used to detect *post-pasteurization contamination*. The standard is a coliform count of <10/ml of pasteurized milk.

Question 485: Sorghum is pellagrogenic due to excess content of which amino acid?

A. Lysine
B. Threonine
C. Leucine (Correct Answer)
D. Tryptophan

Explanation: **Explanation:** Pellagra is traditionally associated with a deficiency of **Niacin (Vitamin B3)** or its precursor, the amino acid **Tryptophan**. However, in populations where **Sorghum (Jowar)** is the staple diet, pellagra occurs despite adequate tryptophan levels. **Why Leucine is the correct answer:** Sorghum contains high concentrations of the amino acid **Leucine**. High dietary leucine interferes with the synthesis of Nicotinamide Adenine Dinucleotide (NAD) by inhibiting the enzyme **Quinolinate Phosphoribosyl Transferase (QPRT)** in the tryptophan-niacin pathway. This metabolic block leads to a functional niacin deficiency, making sorghum "pellagrogenic." **Analysis of Incorrect Options:** * **A. Lysine:** This is a limiting amino acid in most cereals (like wheat and rice), but its deficiency is not linked to pellagra. * **B. Threonine:** An essential amino acid that does not play a role in the pathogenesis of pellagra or niacin metabolism. * **D. Tryptophan:** Pellagra is caused by a *deficiency* of tryptophan (as seen in maize-based diets), not an *excess*. In sorghum, tryptophan levels are usually normal, but its conversion is blocked by leucine. **High-Yield Clinical Pearls for NEET-PG:** * **The 4 D’s of Pellagra:** Dermatitis (Casal’s necklace), Diarrhea, Dementia, and Death. * **Maize vs. Sorghum:** Maize causes pellagra because it is deficient in Tryptophan and its Niacin is bound (**Niacytin**). Sorghum causes pellagra due to **excess Leucine**. * **Amino Acid Precursor:** 60 mg of dietary Tryptophan yields 1 mg of Niacin. * **Hartnup Disease:** A genetic disorder of tryptophan absorption that also presents with pellagra-like symptoms.

Question 486: What is the recommended daily protein intake for an adult?

A. 0.7 gm/kg for egg protein and 0.7 gm/kg for mixed vegetable protein
B. 1.0 gm/kg for egg protein and 1.0 gm/kg for mixed vegetable protein
C. 0.7 gm/kg for egg protein and 1.0 gm/kg for mixed vegetable protein (Correct Answer)
D. 1.0 gm/kg for egg protein and 0.7 gm/kg for mixed vegetable protein

Explanation: **Explanation:** The recommended dietary allowance (RDA) for protein is based on the **Net Protein Utilization (NPU)** and the biological value of the protein source. 1. **Why Option C is correct:** * **Egg Protein:** Considered the "Reference Protein" with an NPU of 100. Because it is fully utilized by the body, a lower amount is required to maintain nitrogen balance. The requirement is approximately **0.7 gm/kg body weight/day**. * **Mixed Vegetable Protein:** Indian diets are predominantly plant-based, which have lower digestibility and a lower NPU (around 65%). To compensate for this lower quality, a higher quantity is required to meet the body's amino acid needs. Thus, the RDA is adjusted upward to **1.0 gm/kg body weight/day**. 2. **Why other options are incorrect:** * **Options A & B:** These suggest that high-quality animal protein and lower-quality vegetable protein are required in equal amounts. This ignores the concept of "Protein Quality." * **Option D:** This incorrectly suggests that vegetable protein is more efficient than egg protein, which contradicts nutritional science. **High-Yield NEET-PG Pearls:** * **Reference Protein:** Egg (NPU = 100). * **Safe Level of Protein:** For an average Indian adult, it is **1 gm/kg/day**. * **Limiting Amino Acids:** Pulses are deficient in **Methionine**, while Cereals are deficient in **Lysine**. This is why a cereal-pulse combination (ratio 4:1) is recommended to improve protein quality. * **Protein Energy Ratio:** In a balanced diet, proteins should contribute **10-15%** of total daily energy intake.

Question 487: Which of the following is not seen in pellagra?

A. Diarrhea
B. Dyspepsia (Correct Answer)
C. Dementia
D. Dermatitis

Explanation: **Explanation:** Pellagra is a nutritional deficiency disease caused by a lack of **Niacin (Vitamin B3)** or its precursor amino acid, **Tryptophan**. It is classically characterized by the **"3 Ds"** (and a 4th D, Death, if left untreated). 1. **Why Dyspepsia is the correct answer:** While Pellagra involves significant gastrointestinal symptoms, **Dyspepsia** (indigestion/upper abdominal discomfort) is not a diagnostic hallmark of the disease. The gastrointestinal involvement in Pellagra specifically manifests as inflammation of the entire digestive tract, leading to chronic diarrhea rather than simple dyspeptic symptoms. 2. **Analysis of Incorrect Options (The 3 Ds):** * **Diarrhea (Option A):** This is the most common gastrointestinal manifestation. It results from widespread inflammation of the mucous membranes (stomatitis, glossitis, and enteritis). * **Dementia (Option C):** This represents the neurological component. Early symptoms include irritability and insomnia, progressing to confusion, memory loss, hallucinations, and eventually frank dementia. * **Dermatitis (Option D):** This is the most characteristic sign. It presents as a symmetrical, bilateral erythematous rash on sun-exposed areas. A classic finding is **Casal’s Necklace**, a collar-like dermatitis around the neck. **High-Yield Clinical Pearls for NEET-PG:** * **The 4 Ds of Pellagra:** Dermatitis, Diarrhea, Dementia, and Death. * **Casal’s Necklace:** Pathognomonic skin lesion around the lower neck. * **Maize/Sorghum Connection:** Pellagra is common in populations where maize (corn) or Jowar (Sorghum) is the staple diet. Maize is deficient in Tryptophan and contains niacin in a bound, unabsorbable form (niacytin). Jowar contains high levels of **Leucine**, which interferes with niacin metabolism. * **Hartnup Disease:** A genetic disorder of tryptophan absorption that can lead to pellagra-like symptoms.

Question 488: Which of the following tests is NOT used to check the efficiency of pasteurization of milk?

A. Phosphatase test
B. Standard plate count
C. Coliform count
D. Methylene blue reduction test (Correct Answer)

Explanation: **Explanation:** The efficiency of pasteurization is evaluated by ensuring the destruction of pathogenic bacteria and specific heat-sensitive enzymes. **Why Methylene Blue Reduction Test (MBRT) is the correct answer:** The MBRT is **not** a test for pasteurization efficiency; rather, it is used to assess the **bacteriological quality of raw milk** before processing. It measures the metabolic activity of bacteria; the faster the blue color disappears (decolorization), the higher the bacterial load and the poorer the quality of the milk. **Analysis of incorrect options:** * **Phosphatase Test:** This is the **gold standard** for checking pasteurization efficiency. The enzyme alkaline phosphatase is naturally present in raw milk and is destroyed at temperatures slightly higher than those required to kill *Mycobacterium tuberculosis*. A negative test indicates successful pasteurization. * **Standard Plate Count (SPC):** This measures the total number of viable bacteria in the milk post-pasteurization. According to public health standards, pasteurized milk should not exceed 30,000 bacteria per ml. * **Coliform Count:** Coliforms are killed by pasteurization. Their presence in pasteurized milk indicates **post-pasteurization contamination** (e.g., dirty equipment or improper handling), thus serving as a check on the process's overall hygiene. **High-Yield Pearls for NEET-PG:** * **Phosphatase Test:** Most sensitive indicator of pasteurization. * **Holder Method:** 63°C (145°F) for 30 minutes. * **HTST (High-Temperature Short-Time):** 72°C (161°F) for 15 seconds. * **Coxiella burnetii:** The most heat-resistant pathogen in milk; pasteurization is designed to eliminate it.

Question 489: Which of the following statements about Recommended Dietary Allowances (RDA) is true?

A. RDA is statistically defined as two standard deviations (SD) above Estimated Average Requirement (EAR) (Correct Answer)
B. RDA is defined as being equal to the Estimated Average Requirement (EAR)
C. RDA is defined as being equal to Adequate Intake (AI)
D. RDA is defined as the recommended minimum requirement

Explanation: ### Explanation **1. Why Option A is Correct:** The Recommended Dietary Allowance (RDA) is the average daily dietary intake level that is sufficient to meet the nutrient requirements of nearly all (**97–98%**) healthy individuals in a particular life stage and gender group. Statistically, nutrient requirements in a population follow a normal distribution. The **Estimated Average Requirement (EAR)** is the median (50th percentile). To ensure that the vast majority of the population is covered, the RDA is calculated by adding two standard deviations (SD) to the EAR. **Formula:** $RDA = EAR + 2 SD_{req}$ **2. Why Other Options are Incorrect:** * **Option B:** The EAR only meets the needs of **50%** of the population. Using EAR as the RDA would leave half the population nutritionally deficient. * **Option C:** **Adequate Intake (AI)** is used only when there is insufficient scientific evidence to calculate an EAR (and subsequently an RDA). They are distinct categories of Dietary Reference Intakes (DRIs). * **Option D:** RDA is not a "minimum" requirement to prevent deficiency diseases (like Scurvy); it is a goal for daily intake to maintain optimal health and nutrient stores. **3. High-Yield Facts for NEET-PG:** * **RDA for Protein:** 0.83 g/kg body weight/day (as per recent ICMR-NIN guidelines). * **Reference Indian Adult:** Weight is now considered **65 kg for males** and **55 kg for females**. * **Energy Requirements:** Unlike other nutrients, the RDA for Energy is set **equal to the EAR** (not EAR + 2SD) to prevent the risk of over-nutrition and obesity. * **Tolerable Upper Intake Level (UL):** The highest level of daily nutrient intake that is likely to pose no risk of adverse health effects.

Question 490: Which of the following statements regarding amino acid profiles of common food grains is incorrect?

A. Pulses are deficient in methionine.
B. Cereals are deficient in lysine.
C. Wheat is deficient in threonine.
D. Maize is deficient in tryptophan and leucine. (Correct Answer)

Explanation: This question tests your knowledge of the limiting amino acids in common food staples—a high-yield topic for NEET-PG. ### **Explanation of the Correct Option** **Option D is incorrect** (and thus the correct answer) because while Maize is indeed deficient in **Tryptophan**, it is actually **rich in Leucine**. The high concentration of Leucine in Maize interferes with the conversion of Tryptophan to Niacin (Vitamin B3). This biochemical imbalance is the primary reason why populations dependent on maize as a staple diet are at high risk for **Pellagra** (characterized by the 4 D's: Dermatitis, Diarrhea, Dementia, and Death). ### **Analysis of Other Options** * **Option A (Pulses):** Pulses are rich in Lysine but characteristically **deficient in Methionine** and Cysteine (sulfur-containing amino acids). * **Option B (Cereals):** Most cereals (Rice, Wheat) are **deficient in Lysine** but rich in Methionine. * **Option C (Wheat):** In addition to Lysine, **Threonine** is considered the second limiting amino acid in wheat. ### **High-Yield Clinical Pearls for NEET-PG** * **Limiting Amino Acid:** The essential amino acid present in the smallest amount in a food source. * **Mutual Supplementation:** This is the rationale behind mixing cereals and pulses (e.g., Dal-Chawal). The Methionine from cereals compensates for the pulse deficiency, and the Lysine from pulses compensates for the cereal deficiency, improving the overall **Biological Value** of the meal. * **Limiting Amino Acid Summary:** * **Rice:** Lysine (Threonine is 2nd). * **Wheat:** Lysine and Threonine. * **Maize:** Tryptophan and Lysine (High Leucine). * **Pulses:** Methionine. * **Egg:** Reference protein (No limiting amino acids; 100% Biological Value).

Practice by Chapter

Basic Nutritional Requirements

Practice Questions

Assessment of Nutritional Status

Practice Questions

Protein-Energy Malnutrition

Practice Questions

Micronutrient Deficiencies

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Nutritional Programs in India

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Dietary Guidelines

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Food Safety and Security

Practice Questions

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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