Nutrition and Health — MCQs

Nutrition and Health Indian Medical PG Practice Questions and MCQs

Question 31: Which of the following is NOT used in assessing the nutritional status of a community?

A. Mortality in the 1-4 years age group
B. Percentage of pregnant women with less than 11.5% Hb (Correct Answer)
C. Weight-for-height index in preschool children
D. Low birth weight

Explanation: In community medicine, assessing the nutritional status of a population involves using **indirect indicators** (vital statistics) and **direct indicators** (anthropometry and biochemical tests). ### **Why Option B is the Correct Answer** The WHO criteria for diagnosing anemia in pregnant women is a hemoglobin (Hb) level **less than 11.0 g/dL**. The value mentioned in the option (**11.5%**) is incorrect both in terms of the threshold and the units (Hb is measured in g/dL, not percentage). Therefore, it is not a standard parameter used for assessment. ### **Analysis of Incorrect Options** * **A. Mortality in the 1-4 years age group:** This is a sensitive indicator of community nutrition. Since children in this age group are transitioning to adult diets, deaths here are often due to the "malnutrition-infection synergetic cycle." * **C. Weight-for-height index:** This is a direct anthropometric measure. Low weight-for-height indicates **wasting**, which reflects acute malnutrition in a community. * **D. Low birth weight (LBW):** LBW (birth weight <2.5 kg) is a proxy indicator of the nutritional status of mothers and the prevalence of intrauterine growth restriction in the community. ### **High-Yield NEET-PG Pearls** * **WHO Anemia Cut-offs:** * Pregnant women & Children (6–59 months): **<11 g/dL** * Non-pregnant women (>15 years): **<12 g/dL** * Men (>15 years): **<13 g/dL** * **Best indicator of social development:** Under-five mortality rate. * **Best indicator of acute malnutrition (Wasting):** Weight-for-height. * **Best indicator of chronic malnutrition (Stunting):** Height-for-age. * **Quac Stick:** A method used to measure mid-upper arm circumference (MUAC) for age to assess malnutrition in emergencies.

Question 32: Height in cms by the cube root of body weight is known as which index?

A. Quetlet index
B. Broca index
C. Ponderal index (Correct Answer)
D. Corpulence index

Explanation: This question tests your knowledge of anthropometric indices used to assess nutritional status and obesity, a high-yield topic in Community Medicine. ### **Explanation of the Correct Answer** The **Ponderal Index (PI)**, also known as the Rohrer's Index, is calculated as: $$\text{Ponderal Index} = \frac{\text{Height (cm)}}{\sqrt[3]{\text{Weight (kg)}}}$$ Unlike the Body Mass Index (BMI), which relates weight to the square of height, the Ponderal Index uses the cube root of weight. It is particularly useful in pediatrics and neonatology to assess whether a newborn is "wasted" (asymmetric intrauterine growth restriction), as it is more sensitive to body proportions than BMI in infants. ### **Analysis of Incorrect Options** * **A. Quetlet Index:** This is the most common name for the **Body Mass Index (BMI)**. It is calculated as $\text{Weight (kg)} / \text{Height (m)}^2$. It is the gold standard for classifying obesity in adults. * **B. Broca Index:** A simple formula used to estimate "Ideal Body Weight." It is calculated as: $\text{Height (cm)} - 100$. (e.g., if height is 170 cm, ideal weight is 70 kg). * **C. Corpulence Index:** This is essentially another term for the Ponderal Index when calculated as $W/H^3$. While mathematically related, the specific formula "Height by cube root of weight" is classically defined as the Ponderal Index in standard textbooks. ### **High-Yield Clinical Pearls for NEET-PG** * **Lorentz’s Formula:** A more refined way to calculate ideal body weight: * *Males:* $\text{Height (cm)} - 100 - [(\text{Height} - 150) / 4]$ * *Females:* $\text{Height (cm)} - 100 - [(\text{Height} - 150) / 2]$ * **Corpulence Index (CI):** Calculated as $\text{Weight (kg)} / \text{Height (m)}^3$. * **Dugdale’s Index:** $\text{Weight} / \text{Height}^{1.6}$ (used in children). * **Best indicator of obesity:** Body Fat Percentage (measured via DEXA or skinfold thickness), but BMI remains the most widely used screening tool.

Question 33: Which of the following has the highest biological value?

A. Egg (Correct Answer)
B. Soyabean
C. Milk
D. Meat

Explanation: **Explanation:** The **Biological Value (BV)** of a protein is a measure of the proportion of absorbed protein from food which becomes incorporated into the proteins of the organism's body. It reflects how efficiently the body utilizes the dietary protein for growth and maintenance. **1. Why Egg is Correct:** The **Egg** is considered the "Gold Standard" for protein quality. It has a **Biological Value of approximately 94-96** (often rounded to 100 in comparative indices). This is because egg protein contains all essential amino acids in the ideal proportions required by the human body, with minimal waste during metabolism. **2. Analysis of Incorrect Options:** * **Milk (BV ~84-90):** While milk is a high-quality complete protein (containing casein and whey), its BV is slightly lower than that of an egg. * **Meat/Fish (BV ~75-80):** Animal muscle proteins are excellent sources of amino acids but have a lower efficiency of utilization compared to egg and milk. * **Soyabean (BV ~70-74):** Although soy is the best plant-based protein source and contains all essential amino acids, its BV is lower than animal-derived proteins due to limiting amino acids (methionine) and lower digestibility. **3. NEET-PG High-Yield Pearls:** * **Reference Protein:** Egg is used as the reference protein for comparing all other foods. * **Net Protein Utilization (NPU):** Egg also has the highest NPU (~94). * **Limiting Amino Acids:** * Pulses are deficient in **Methionine**. * Cereals are deficient in **Lysine**. * **Pulse-Cereal Mix:** Combining pulses and cereals (e.g., Khichdi) improves the overall protein quality through **supplementary action of proteins**, achieving a BV comparable to animal protein.

Question 34: Amount of fat is maximum in which type of milk?

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

Explanation: **Explanation:** The fat content in milk varies significantly across species, primarily determined by the nutritional requirements of the offspring. **Buffalo milk** contains the highest concentration of fat among the common domestic sources, typically ranging from **6.5% to 8.0%**. This high fat content makes it more calorie-dense (approx. 100 kcal/100ml) compared to other types. **Analysis of Options:** * **Buffalo Milk (Correct):** Contains the highest fat (6.5–8%) and total solids. It is also richer in calcium and phosphorus but lacks carotene (converting it instead to Vitamin A), which gives it a characteristic white appearance. * **Cow Milk:** Contains approximately **3.5% to 4%** fat. It is rich in carotene, giving it a yellowish tinge. It is often preferred for infants after one year due to easier digestibility compared to buffalo milk. * **Human Milk:** Contains about **3.5% to 4.5%** fat. While the fat quantity is similar to cow milk, it is superior in quality, containing more polyunsaturated fatty acids and essential lipids for brain development. It is lower in protein but higher in lactose (7%) than animal milk. * **Goat Milk:** Contains about **3.5%** fat. Its fat globules are smaller, which theoretically makes it easier to digest, but it is deficient in folic acid, which can lead to "goat milk anemia" (megaloblastic anemia) if used as an exclusive source. **High-Yield Clinical Pearls for NEET-PG:** * **Energy Value:** Buffalo milk (~100 kcal/100ml) > Human milk (~70 kcal/100ml) > Cow milk (~65 kcal/100ml). * **Protein Content:** Buffalo milk has the highest protein (~4.3%), while Human milk has the lowest (~1.1%), making human milk less taxing on neonatal kidneys (lower renal solute load). * **Iron:** All milk types are poor sources of Iron. * **Vitamin C:** Human milk contains more Vitamin C than clear cow/buffalo milk.

Question 35: What is the dietary practice of vegans?

A. Consuming both dairy products and eggs
B. Consuming dairy products but not eggs
C. Consuming eggs but not dairy products
D. Consuming neither dairy products nor eggs (Correct Answer)

Explanation: ### Explanation **Correct Answer: D. Consuming neither dairy products nor eggs** **Understanding the Concept:** Vegetarianism is classified based on the inclusion or exclusion of animal-derived products. **Vegans** (also known as strict vegetarians) exclude all foods of animal origin, including meat, poultry, fish, eggs, and dairy products (milk, cheese, butter). Their diet is derived entirely from plant sources like grains, legumes, fruits, and vegetables. **Analysis of Options:** * **Option A (Dairy and Eggs):** This describes **Lacto-ovo vegetarians**. This is the most common form of vegetarianism globally. * **Option B (Dairy but no Eggs):** This describes **Lacto-vegetarians**. This practice is highly prevalent in the Indian subcontinent. * **Option C (Eggs but no Dairy):** This describes **Ovo-vegetarians**. * **Option D (Neither Dairy nor Eggs):** This is the defining characteristic of **Vegans**. **High-Yield Clinical Pearls for NEET-PG:** * **Nutritional Deficiencies:** Vegans are at a high risk for **Vitamin B12 deficiency** (as B12 is found only in animal foods) and may also lack adequate Calcium, Vitamin D, and Iron. * **Health Benefits:** Vegan diets are typically high in fiber and low in saturated fats, which is associated with a lower risk of obesity, Type 2 diabetes, and ischemic heart disease. * **Biological Value:** Plant proteins generally have a lower biological value than animal proteins; however, vegans can achieve a complete amino acid profile by **"Mutual Supplementation"** (e.g., combining cereals and pulses). * **PBD (Plant-Based Diet):** In recent exams, the term "Whole-food plant-based diet" is often used interchangeably with veganism in the context of lifestyle medicine.

Question 36: What is the daily additional requirement of protein during lactation?

A. 25 gm (Correct Answer)
B. 15 gm
C. 35 gm
D. 50 gm

Explanation: **Explanation:** The protein requirement during lactation is significantly increased to support the production of breast milk, which contains approximately 1.1 gm of protein per 100 ml. According to the **ICMR-NIN (2020) guidelines**, the Recommended Dietary Allowance (RDA) for protein is based on the mother's sedentary weight plus an additional increment. 1. **Why 25 gm is correct:** For a woman with a sedentary lifestyle (base requirement ~46 gm/day), the additional protein requirement is categorized by the stage of lactation: * **0–6 months:** +17 gm/day * **7–12 months:** +13 gm/day * *Note:* In many previous editions of standard textbooks (like Park’s Preventive and Social Medicine) and older ICMR guidelines often tested in NEET-PG, the value was cited as **+25 gm/day** for the first six months. While the 2020 update revised this to +17 gm, **25 gm** remains the classic "high-yield" answer in exams based on older patterns or when calculating the total protein gap needed to ensure high-quality milk production. 2. **Why other options are incorrect:** * **15 gm:** This is closer to the requirement for the second half of pregnancy (+9.5 gm) or late lactation (+13 gm), but underestimates the peak demand. * **35 gm & 50 gm:** These values are excessively high and exceed the physiological requirements for milk synthesis, even accounting for dietary conversion efficiency. **High-Yield Clinical Pearls for NEET-PG:** * **Pregnancy Protein Increment (ICMR 2020):** 1st Trimester: 0; 2nd Trimester: +9.5 gm; 3rd Trimester: +22 gm. * **Energy Increment in Lactation:** +600 kcal/day (0–6 months) and +520 kcal/day (7–12 months). * **Net Protein Utilization (NPU):** For Indian diets, it is generally calculated at 65%. * **Reference Body Weight:** ICMR 2020 defines the reference Indian woman as weighing **55 kg**.

Question 37: To define a health problem, what is the prevalence of corneal xerosis?

A. >1%
B. >0.5%
C. >0.01% (Correct Answer)
D. >0.05%

Explanation: This question pertains to the **WHO criteria for assessing the public health significance of Vitamin A deficiency (VAD)** in a community. These indicators are high-yield for NEET-PG as they define the thresholds at which VAD becomes a significant public health problem among children aged 6–71 months. ### **Explanation of the Correct Answer** **Option C (>0.01%)** is correct. According to WHO, a health problem (epidemic) of Vitamin A deficiency is considered to exist in a community if the prevalence of **Corneal Xerosis (X2), Corneal Ulceration/Keratomalacia (X3), or Corneal Scars (XS)** is **greater than 0.01%**. Because corneal involvement represents the severe, irreversible stage of xerophthalmia, even a very low prevalence is indicative of a major nutritional crisis. ### **Analysis of Incorrect Options** * **Option A (>1%):** This is the threshold for **Night Blindness (X1N)**. If more than 1% of the vulnerable population has night blindness, it is a public health problem. * **Option B (>0.5%):** This is the threshold for **Bitot’s Spots (X1B)**. Bitot’s spots are the most common objective clinical sign used for field surveys. * **Option D (>0.05%):** This value is not a standard WHO threshold for clinical signs of xerophthalmia. ### **High-Yield Clinical Pearls for NEET-PG** To master this topic, remember the **WHO Minimum Prevalence Criteria** for VAD significance: 1. **Night Blindness (X1N):** > 1.0% 2. **Bitot's Spots (X1B):** > 0.5% 3. **Corneal Xerosis/Ulcer/Scar (X2/X3/XS):** > 0.01% 4. **Plasma Retinol (<0.7 µmol/L):** > 5.0% (Biochemical indicator) **Mnemonic:** "Night 1, Bitot 0.5, Cornea 0.01." * **X1N** is the earliest symptom. * **X1B** is the most frequent clinical sign. * **X3 (Keratomalacia)** is a medical emergency.

Question 38: The 'Nalgonda technique' is used in which of the following conditions?

A. Endemic fluorosis (Correct Answer)
B. Epidemic dropsy
C. Endemic ascites
D. Neurolathyrism

Explanation: **Explanation:** The **Nalgonda technique** is a method for the **defluoridation** of water, specifically designed for use at the community or domestic level in areas where **Endemic Fluorosis** is prevalent. Developed by the National Environmental Engineering Research Institute (NEERI) in Nagpur, it involves the sequential addition of **Alum** (Aluminum sulfate), **Lime** (Calcium oxide), and **Bleaching powder** to water, followed by rapid mixing, flocculation, and sedimentation. Alum acts as the primary coagulant to remove fluoride ions, while lime ensures the correct pH and bleaching powder provides disinfection. **Analysis of Incorrect Options:** * **B. Epidemic dropsy:** Caused by the ingestion of mustard oil adulterated with **Argemone mexicana** (Sanguinarine toxin). Management focuses on removing the source and symptomatic treatment (e.g., antioxidants, diuretics). * **C. Endemic ascites:** Caused by the consumption of **Pyrrolizidine alkaloids** (found in *Crotalaria* seeds) contaminating food grains (millet). It is a form of hepatic veno-occlusive disease. * **D. Neurolathyrism:** A neurological condition caused by excessive consumption of *Lathyrus sativus* (Khesari dal) containing the neurotoxin **BOAA**. Prevention involves the "Parboiling" or "Steeping" method to remove the toxin. **High-Yield Clinical Pearls for NEET-PG:** * **Fluoride levels:** Ideal in drinking water is **0.5–0.8 mg/L**. Dental fluorosis occurs when levels exceed **1.5 mg/L**, and skeletal fluorosis occurs at **3–6 mg/L**. * **Genu Valgum:** A characteristic physical deformity (knock-knees) seen in endemic fluorosis areas. * **Defluoridation:** Besides the Nalgonda technique, **Activated Alumina** (Prashanti technique) is another common method used.

Question 39: Which cancers are associated with excess fat intake?

A. Breast cancer
B. Colon cancer
C. Prostate cancer
D. All of the above (Correct Answer)

Explanation: **Explanation:** The correct answer is **D. All of the above.** In Community Medicine and Oncology, the link between dietary fat intake and carcinogenesis is well-established. High fat intake, particularly saturated fats and trans-fats, contributes to cancer through several mechanisms: increased production of steroid hormones, promotion of bile acid secretion, and chronic systemic inflammation associated with obesity. 1. **Breast Cancer:** High fat intake is linked to increased circulating levels of estrogen. Adipose tissue contains the enzyme **aromatase**, which converts androgens into estrogens. Elevated estrogen is a primary driver for hormone-receptor-positive breast cancer, especially in post-menopausal women. 2. **Colon Cancer:** Diets high in animal fats increase the secretion of **bile acids** into the gut. Intestinal bacteria can metabolize these into secondary bile acids (like deoxycholic acid), which act as promoters of colonic mucosal tumors. 3. **Prostate Cancer:** Epidemiological studies show a strong correlation between high-fat "Western" diets and prostate cancer. The mechanism is thought to involve alterations in testosterone levels and insulin-like growth factor (IGF-1) signaling. **Why other options are incorrect:** Options A, B, and C are all individually correct; therefore, "All of the above" is the most comprehensive choice. Excluding any of them would be medically inaccurate based on current epidemiological data. **High-Yield Clinical Pearls for NEET-PG:** * **Dietary Fiber:** Acts as a protective factor against colon cancer by diluting carcinogens and shortening transit time. * **Aflatoxin:** A potent risk factor for **Hepatocellular Carcinoma**. * **Nitrosamines:** Found in smoked/cured meats; strongly associated with **Esophageal and Gastric cancers**. * **Obesity:** Now recognized as a leading preventable cause of cancer, second only to tobacco.

Question 40: What plasma retinol value is considered marginal in children?

A. 0.25 to 0.35 mmol/L
B. 0.35 to 0.7 mmol/L
C. 0.7 to 1.05 mmol/L (Correct Answer)
D. 1.05 to 1.45 mmol/L

Explanation: **Explanation:** The assessment of Vitamin A status is primarily done by measuring **Serum Retinol (Plasma Retinol)** levels. According to WHO and standard nutritional guidelines, serum retinol levels reflect the body's liver stores only when they are critically low or very high. 1. **Why Option C is Correct:** A serum retinol level between **0.70 to 1.05 µmol/L** is clinically defined as **marginal status**. At this level, liver reserves are beginning to deplete, and the child is at a higher risk of developing clinical deficiency if an infection or period of poor intake occurs. * *Note:* 0.7 µmol/L is approximately equal to 20 µg/dL. 2. **Analysis of Incorrect Options:** * **Options A & B (< 0.7 µmol/L):** These values represent **Vitamin A Deficiency (VAD)**. Specifically, levels below **0.35 µmol/L** are considered "severe deficiency," while **0.35 to 0.7 µmol/L** indicate "low" or "deficient" status. * **Option D (> 1.05 µmol/L):** Values above 1.05 µmol/L (specifically > 1.2 µmol/L) are considered **adequate** or "normal" for children. **High-Yield NEET-PG Pearls:** * **Gold Standard for Vitamin A status:** Relative Dose Response (RDR) test or Liver Biopsy (though biopsy is rarely done). * **Most sensitive clinical indicator:** Conjunctival Impression Cytology (CIC). * **First clinical sign:** Conjunctival Xerosis (X1A). * **First symptom:** Night Blindness (XN). * **WHO Cut-off for Public Health Significance:** If ≥ 20% of the population has serum retinol < 0.7 µmol/L, it is considered a severe public health problem.

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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