Nutrition and Health — MCQs

Nutrition and Health Indian Medical PG Practice Questions and MCQs

Question 181: What is the percentage of fiber in animal foods?

A. 0% (Correct Answer)
B. 1%
C. 2%
D. 5%

Explanation: **Explanation:** **1. Why Option A is Correct:** Dietary fiber is a complex carbohydrate (non-starch polysaccharide) found exclusively in the cell walls of plants. Animal cells do not possess cell walls; instead, they are enclosed by a plasma membrane composed of lipids and proteins. Consequently, all animal-derived foods—including meat, poultry, fish, eggs, and dairy products—contain **0% fiber**. Fiber is strictly a plant-derived nutrient. **2. Why Other Options are Incorrect:** * **Options B, C, and D (1%, 2%, 5%):** These values are incorrect because fiber is not a constituent of animal tissue. Even trace amounts of fiber are absent in pure animal products. Any fiber detected in a meat-based dish would originate from added plant ingredients (like spices, breading, or vegetable fillers), not the animal source itself. **3. NEET-PG High-Yield Pearls:** * **Definition:** Dietary fiber consists of unabsorbable plant carbohydrates (e.g., cellulose, hemicellulose, pectin, gums) and non-carbohydrate lignin. * **Classification:** * *Soluble Fiber:* Found in oats, barley, and legumes; helps lower LDL cholesterol and regulate blood glucose. * *Insoluble Fiber:* Found in whole grains and vegetables; increases stool bulk and prevents constipation. * **Recommended Intake:** The WHO recommends an intake of **25–40 grams per day** for an average adult. * **Health Benefits:** High fiber intake is associated with a reduced risk of Coronary Heart Disease (CHD), Type 2 Diabetes, Obesity, and Colorectal Cancer. * **Energy Value:** Fiber provides approximately **2 kcal/g** due to partial fermentation by colonic bacteria.

Question 182: Parboiling of rice reduces the incidence of which deficiency disease?

A. Pellagra
B. Beriberi (Correct Answer)
C. Dermatitis
D. All of the above

Explanation: **Explanation:** **Parboiling** is a process where paddy is soaked in water, steamed, and dried before milling. This process is highly effective in preventing **Beriberi**, which is caused by a deficiency of **Vitamin B1 (Thiamine)**. 1. **Why Beriberi is the correct answer:** In raw rice, Thiamine is concentrated in the outer layer (pericarp) and the germ. During ordinary milling, these layers are removed, leading to a loss of nearly 80% of Thiamine. During parboiling, the water-soluble vitamins (especially Thiamine) diffuse from the outer husk into the inner endosperm. Even after the outer layers are removed during milling, the Thiamine remains locked within the grain, making parboiled rice nutritionally superior. 2. **Why other options are incorrect:** * **Pellagra:** Caused by a deficiency of **Niacin (Vitamin B3)**. It is classically associated with a **maize-based diet** (due to low tryptophan and bound niacin) or a jowar-based diet (due to high leucine), not polished rice. * **Dermatitis:** While dermatitis is a feature of various vitamin deficiencies (like B2, B3, or B6), it is not the specific clinical condition targeted by the parboiling process. **High-Yield Facts for NEET-PG:** * **Thiamine (B1)** acts as a coenzyme for *pyruvate dehydrogenase*; deficiency leads to impaired carbohydrate metabolism and accumulation of pyruvic acid. * **Infantile Beriberi:** Typically occurs between 2–4 months of age in infants breastfed by thiamine-deficient mothers. * **Wernicke-Korsakoff Syndrome:** The neuropsychiatric manifestation of Thiamine deficiency, most commonly seen in chronic alcoholics. * **Cooking Tip:** Washing rice repeatedly or cooking in excess water that is later discarded also leads to significant Thiamine loss.

Question 183: Dietary Reference Intake recommendations include all of the following except:

A. Recommended Dietary Allowances
B. Adequate Intake
C. Upper tolerable level
D. Food-based dietary guidelines (Correct Answer)

Explanation: **Explanation:** The **Dietary Reference Intake (DRI)** is a system of nutrition recommendations used to plan and assess nutrient intakes of healthy people. It is a quantitative, nutrient-based framework rather than a qualitative, food-based one. **1. Why "Food-based dietary guidelines" is the correct answer:** Food-based dietary guidelines (FBDG) are **qualitative** recommendations (e.g., "Eat 5 portions of fruits and vegetables" or "Choose whole grains"). In contrast, DRIs are **quantitative** values expressed in specific units (mg, mcg, or kcal) for individual nutrients. While FBDGs translate nutritional science into practical food choices, they are not a component of the DRI framework. **2. Analysis of incorrect options (Components of DRI):** * **Recommended Dietary Allowances (RDA):** The average daily dietary intake level sufficient to meet the nutrient requirements of nearly all (97–98%) healthy individuals in a particular life stage and gender group. * **Adequate Intake (AI):** Used when evidence is insufficient to develop an RDA. It is a value based on observed or experimentally determined approximations of nutrient intake by a group of healthy people. * **Tolerable Upper Intake Level (UL):** The highest level of daily nutrient intake that is likely to pose no risk of adverse health effects to almost all individuals in the general population. **High-Yield NEET-PG Pearls:** * **Estimated Average Requirement (EAR):** The intake level for a nutrient at which the needs of 50% of the population will be met. * **RDA Formula:** $RDA = EAR + 2 SD$ (Standard Deviation). * **Net Protein Utilization (NPU):** For an average Indian diet, NPU is approximately **65**. * **Reference Protein:** Egg protein is considered the reference protein (Biological Value = 100).

Question 184: What is the most immediate treatment for night blindness?

A. Topical vitamin A
B. Oral vitamin A (Correct Answer)
C. Parenteral vitamin A
D. None of the above

Explanation: **Explanation** The correct answer is **B. Oral vitamin A**. **Why Oral Vitamin A is the Correct Choice:** Night blindness (Nyctalopia) is the earliest clinical symptom of Vitamin A deficiency (Xerophthalmia). According to WHO guidelines and the National Programme for Control of Blindness, the **oral route** is the preferred and most effective method for treatment and prophylaxis. Vitamin A is a fat-soluble vitamin that is well-absorbed from the gastrointestinal tract even in the presence of mild malabsorption. Oral administration is non-invasive, cost-effective, and carries a lower risk of anaphylaxis compared to other routes. **Why Other Options are Incorrect:** * **A. Topical Vitamin A:** Vitamin A must be metabolized into retinaldehyde to function in the visual cycle (rhodopsin regeneration). Topical application to the cornea does not provide the systemic levels required for retinal function and is not a standard treatment for night blindness. * **C. Parenteral Vitamin A:** Intramuscular (IM) injections are reserved only for patients with severe malabsorption, persistent vomiting, or conditions like paralytic ileus. Furthermore, the water-miscible IM preparation is often less available and more expensive than oral capsules. **High-Yield Clinical Pearls for NEET-PG:** * **Treatment Schedule:** For children >1 year with clinical signs, the dose is **200,000 IU orally** immediately on diagnosis, followed by a second dose the next day, and a third dose after 1-4 weeks. * **Earliest Sign vs. Symptom:** Night blindness is the earliest **symptom**, while Conjunctival Xerosis is the earliest **sign**. * **Bitot’s Spots:** These represent keratinized epithelial debris and are classified as **X1B** in the WHO classification. * **Prophylaxis Dose:** Under the National Vitamin A Prophylaxis Programme, children aged 6–11 months receive 1 lakh IU, and children 1–5 years receive 2 lakh IU every 6 months.

Question 185: What is the pH at which the initiation of dental caries begins?

A. 4.3 - 4.5
B. 5.2 - 5.5 (Correct Answer)
C. 4.9 - 5.1
D. 3.5 - 4.5

Explanation: ### Explanation **1. The Core Concept: Critical pH** Dental caries is a dynamic process of demineralization and remineralization. The "Critical pH" is the specific threshold below which the environment becomes acidic enough to cause the dissolution of tooth enamel (hydroxyapatite crystals). For dental enamel, this critical threshold is widely accepted as **5.2 to 5.5**. When oral bacteria (like *Streptococcus mutans*) ferment dietary carbohydrates, they produce organic acids. Once the plaque pH drops into this 5.2–5.5 range, the saliva and plaque fluid become undersaturated with calcium and phosphate ions, leading to the initiation of enamel demineralization. **2. Analysis of Options** * **Option B (5.2 - 5.5): Correct.** This is the physiological threshold where the rate of mineral loss exceeds the rate of mineral gain in enamel. * **Options A, C, and D:** These values represent significantly more acidic environments. While demineralization occurs much faster at a pH of 4.5 or 3.5, these are not the *initiation* points. By the time the pH reaches 4.5, significant damage is already underway. Note: For **root dentin**, the critical pH is higher (~6.2 to 6.7), making roots more susceptible to decay than enamel. **3. High-Yield Clinical Pearls for NEET-PG** * **Stephan Curve:** The graph depicting the rapid drop and gradual recovery of plaque pH after glucose exposure. * **Vipeholm Study:** Established the link between the *frequency* of sugar intake and caries risk (more important than the total amount). * **Fluoride’s Role:** Fluoride lowers the critical pH to approximately **4.5** by forming fluorapatite, which is more resistant to acid dissolution. * **Saliva:** Acts as a natural buffer (bicarbonate system) to raise the pH back above the 5.5 threshold.

Question 186: Which of the following statements is FALSE?

A. Milk is a poor source of iron.
B. Eggs are a poor source of vitamin C.
C. Soybeans are classified as pulses.
D. Vitamin A is used for the prophylaxis of Lathyrism. (Correct Answer)

Explanation: ### Explanation **1. Why Option D is the Correct Answer (The False Statement):** Lathyrism is a nervous system disorder (Neurolathyrism) caused by the chronic consumption of *Lathyrus sativus* (Khesari dal), which contains the neurotoxin **BOAA** (Beta-oxalyl-amino-alanine). **Vitamin A has no role in the prophylaxis of Lathyrism.** The primary prevention strategy involves banning the crop, removing the toxin (parboiling or steeping), or promoting "dilution" by mixing it with other cereals. Vitamin A prophylaxis is specifically used to prevent nutritional blindness (Xerophthalmia). **2. Analysis of Other Options (True Statements):** * **Option A:** Milk is famously known as a "poor source" of **Iron and Vitamin C**. It is, however, a rich source of calcium and high-quality proteins. * **Option B:** Eggs are considered a "reference protein" (Biological Value = 94) and contain almost all vitamins except **Vitamin C**. * **Option C:** Soybeans are botanically legumes. In nutritional classification, they are grouped under **Pulses** but are unique due to their high protein (40%) and fat (20%) content, often referred to as "the meat of the field." **3. NEET-PG High-Yield Pearls:** * **Lathyrism Stages:** Latent → No-stick → One-stick → Two-stick → Crawler stage. * **BOAA Toxin:** Also known as ODAP. Safe limit in pulses is <0.2%. * **Milk Deficiency:** Remember the mnemonic "Milk is **I**n**C**omplete" (Lacks **I**ron and Vitamin **C**). * **Reference Protein:** Egg is the gold standard for comparing protein quality. * **Limiting Amino Acids:** Pulses are deficient in Methionine; Cereals are deficient in Lysine. Soybeans are an exception as they are relatively rich in Lysine.

Question 187: Second degree of undernutrition means?

A. Weight below 50% of the standard
B. Weight below 60% of the standard
C. Weight between 60% and 81% of the standard
D. Weight between 61% and 70% of the standard (Correct Answer)

Explanation: This question refers to the **Gomez Classification**, which was one of the first systems used to categorize Protein-Energy Malnutrition (PEM) based on **weight-for-age** percentages compared to the 50th percentile of the Harvard standard. ### 1. Why the Correct Answer is Right According to the Gomez Classification, nutritional status is graded based on the percentage of expected weight for a child's age: * **Normal:** >90% of the standard weight. * **First Degree (Mild):** 76% – 90% * **Second Degree (Moderate):** 61% – 75% (In many competitive exams, including NEET-PG, the range **61% – 70%** is specifically tested as the hallmark of Grade II undernutrition). * **Third Degree (Severe):** <60% ### 2. Analysis of Incorrect Options * **Option A (<50%):** This falls under Third Degree (Severe) malnutrition. * **Option B (<60%):** This is the threshold for Third Degree (Severe) malnutrition. In the IAP (Indian Academy of Pediatrics) classification, <60% is Grade III and IV. * **Option C (60% - 81%):** This range is too broad and overlaps across Grade I and Grade II classifications. ### 3. High-Yield Clinical Pearls for NEET-PG * **IAP Classification:** This is more commonly used in India. It classifies malnutrition into four grades: * Grade I: 71–80% * Grade II: 61–70% * Grade III: 51–60% * Grade IV: ≤50% * **Waterlow’s Classification:** Focuses on **Wasting** (Weight-for-height) to indicate acute malnutrition and **Stunting** (Height-for-age) to indicate chronic malnutrition. * **WHO Classification (Z-scores):** The current gold standard. Moderate Acute Malnutrition (MAM) is between -2 and -3 SD, and Severe Acute Malnutrition (SAM) is <-3 SD or presence of edema/MUAC <11.5 cm.

Question 188: Which of the following statements is true regarding the given program?

A. Deworming of children aged 5-9 years with Albendazole 400 mg - 2 tablets.
B. IFA supplementation in children aged 5-9 years: Iron (45 mg), Folic Acid (500 mcg) Weekly - Pink tablet.
C. IFA supplementation for adolescents aged 10-19 years: Iron (60 mg), Folic Acid (500 mcg) Weekly - Blue tablet. (Correct Answer)
D. IFA supplementation for children aged 6-59 months: Iron (30 mg), Folic Acid (200 mcg) Biweekly - Bottle 50 ml.

Explanation: ***IFA supplementation for adolescents aged 10-19 years: Iron (60 mg), Folic Acid (500 mcg) Weekly - Blue tablet.*** - Under the **WIFS program** of Anemia Mukt Bharat, adolescents (10-19 years) receive **weekly IFA supplementation** with the correct dose of Iron 60 mg and Folic Acid 500 mcg in blue tablets. - This is the standard protocol for **preventing anemia** in adolescents as part of the **National Iron Plus Initiative**. *Deworming of children aged 5-9 years with Albendazole 400 mg - 2 tablets.* - **Albendazole dose** for children aged 5-9 years is **400 mg as a single tablet**, not 2 tablets. - The **National Deworming Day** protocol specifies one 400 mg tablet for children above 2 years of age. *IFA supplementation in children aged 5-9 years: Iron (45 mg), Folic Acid (500 mcg) Weekly - Pink tablet.* - Children aged 5-9 years receive **Iron 45 mg and Folic Acid 250 mcg weekly**, not 500 mcg of folic acid. - The **pink tablet** is correct for this age group, but the **folic acid dose is incorrect** in this option. *IFA supplementation for children aged 6-59 months: Iron (30 mg), Folic Acid (200 mcg) Biweekly - Bottle 50 ml.* - Children aged 6-59 months receive **Iron 20 mg and Folic Acid 100 mcg twice weekly**, not the doses mentioned. - The supplementation is given **twice weekly**, not biweekly, and comes in **2.5 ml syrup bottles**.

Question 189: What is the recommended amount of cereal to be provided in the mid-day meal program?

A. 8 gm
B. 30 gm
C. 150 gm
D. None of the above (Correct Answer)

Explanation: The Mid-Day Meal (MDM) Scheme, now known as **PM POSHAN**, follows specific nutritional norms based on the school level (Primary vs. Upper Primary). The correct answer is **None of the above** because the recommended quantity of food grains (cereals) does not match any of the provided options. ### **Explanation of the Correct Answer** According to the current guidelines of the MDM scheme: * **Primary (Classes I–V):** 100 grams of food grains (cereals) per child per day. * **Upper Primary (Classes VI–VIII):** 150 grams of food grains (cereals) per child per day. Since the question does not specify the level and asks for a general recommendation, and 100g is the baseline for primary students, neither 8g, 30g, nor 150g (as a standalone universal figure) fits the standard primary recommendation often tested in exams. While 150g is used for Upper Primary, the standard "unit" for MDM questions usually defaults to the Primary level unless specified. ### **Analysis of Incorrect Options** * **A (8 gm):** This is incorrect. 8g is closer to the fat requirement for Upper Primary (7.5g). * **B (30 gm):** This is incorrect. 30g is the recommended amount of **pulses** for the Upper Primary level (Primary requires 20g). * **C (150 gm):** While this is the amount for Upper Primary, it is not the universal standard for the program's baseline (Primary). ### **High-Yield Facts for NEET-PG** | Component | Primary (I-V) | Upper Primary (VI-VIII) | | :--- | :--- | :--- | | **Calories** | 450 kcal | 700 kcal | | **Proteins** | 12 g | 20 g | | **Food Grains** | 100 g | 150 g | | **Pulses** | 20 g | 30 g | | **Vegetables** | 50 g | 75 g | | **Oil & Fat** | 5 g | 7.5 g | **Clinical Pearl:** The MDM scheme aims to provide **1/3rd of the daily energy requirement** and **1/2 of the daily protein requirement** for the child.

Question 190: Which of the following is NOT considered one of the three cardinal determinants of undernutrition?

A. Low birth weight
B. Infections
C. Inadequate water intake (Correct Answer)
D. Low food intake

Explanation: ### Explanation The concept of undernutrition in public health is governed by a synergistic relationship between biological, environmental, and dietary factors. According to the standard epidemiological framework for malnutrition (often cited in the context of the UNICEF framework), there are three primary cardinal determinants that drive undernutrition in children: 1. **Low Birth Weight (LBW):** This is a critical predictor of future growth. A child born with LBW (<2.5 kg) starts with a nutritional deficit and is at a significantly higher risk of stunting and wasting throughout childhood. 2. **Inadequate Dietary Intake:** This refers to the lack of sufficient macronutrients (calories/protein) and micronutrients required for age-appropriate growth. 3. **Infections:** There is a "vicious cycle" between malnutrition and infection. Infections (like diarrhea or respiratory tract infections) lead to malabsorption and nutrient loss, while undernutrition weakens immunity, making the child more susceptible to further infections. **Why "Inadequate water intake" is the correct answer:** While hydration is essential for physiological function, it is **not** classified as a cardinal determinant of undernutrition. In the context of Community Medicine, "water" is usually discussed as a vehicle for pathogens (water-borne diseases) which then leads to infection, rather than the lack of water volume itself being a primary cause of chronic undernutrition. **High-Yield Clinical Pearls for NEET-PG:** * **The Vicious Cycle:** Malnutrition $\rightarrow$ Impaired Immunity $\rightarrow$ Increased Infection $\rightarrow$ Nutrient Loss $\rightarrow$ Worsening Malnutrition. * **LBW Cut-off:** <2500 grams regardless of gestational age. * **Most Common Micronutrient Deficiency:** Iron deficiency is the most common globally, but Vitamin A deficiency is the leading cause of preventable childhood blindness. * **Protein-Energy Malnutrition (PEM):** Classified primarily by the **Gomez classification** (weight-for-age) or **Waterlow’s classification** (stunting vs. wasting).

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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