Nutrition and Health — MCQs

Nutrition and Health Indian Medical PG Practice Questions and MCQs

Question 91: What food standards are utilized for the international food market?

A. ISI
B. AGMARK
C. Codex alimentarius (Correct Answer)
D. Bureau of Indian Standards

Explanation: **Explanation:** **1. Why Codex Alimentarius is Correct:** The **Codex Alimentarius** (Latin for "Food Code") is a collection of internationally recognized standards, codes of practice, and guidelines relating to food safety and quality. It was established in 1963 by the **FAO (Food and Agriculture Organization)** and the **WHO (World Health Organization)**. Its primary purpose is to protect consumer health and ensure fair practices in the **international food trade**. It serves as the global reference point for consumers, food producers, and international trade agencies. **2. Why Other Options are Incorrect:** * **ISI (Indian Standards Institute):** Now known as the BIS certification mark, it is a standard-compliance mark for industrial products in **India**. While it covers some food items (like condensed milk), it is a national, not international, standard. * **AGMARK:** This is a certification mark employed on agricultural products in **India** (e.g., oils, ghee, pulses). it ensures quality based on the Agricultural Produce (Grading and Marking) Act of India. * **Bureau of Indian Standards (BIS):** This is the National Standard Body of **India** responsible for the harmonious development of the activities of standardization, marking, and quality certification. **3. High-Yield Facts for NEET-PG:** * **PFA Act (1954):** The Prevention of Food Adulteration Act is the primary legislative body in India for food safety (replaced by FSSAI). * **FSSAI (2006):** The Food Safety and Standards Authority of India is the current apex body consolidating various food laws in India. * **Consumer Protection:** While AGMARK is voluntary for many products, it is mandatory for certain items like Blended Edible Vegetable Oils. * **Codex Commission:** It currently has 188 Member Countries and 1 Member Organization (EU), covering 99% of the world’s population.

Question 92: Which of the following foods is generally considered to be high in potassium?

A. Green leafy vegetables (Correct Answer)
B. Milk
C. Banana
D. Iodised salt

Explanation: **Explanation:** **Correct Answer: A. Green leafy vegetables** Potassium is an essential intracellular cation, and its primary dietary sources are plant-based foods. **Green leafy vegetables (GLVs)**, such as spinach, amaranth, and fenugreek, are among the richest sources of potassium. In the context of Community Medicine and Nutrition, GLVs are emphasized not only for their micronutrient density (Iron, Vitamin A, and Folate) but also for their high potassium-to-sodium ratio, which is vital for blood pressure regulation and cardiovascular health. **Analysis of Incorrect Options:** * **B. Milk:** While milk contains potassium, it is primarily valued as a source of high-biological-value protein, Calcium, and Phosphorus. It is not considered a "high" source compared to plant concentrates. * **C. Banana:** This is a common distractor. While bananas are a well-known source of potassium, **Green Leafy Vegetables generally contain a higher concentration of potassium per 100g** compared to bananas. In competitive exams, if both are present, GLVs are the preferred answer. * **D. Iodised salt:** This is a source of Sodium and Iodine. It contains negligible to no potassium unless specifically formulated as "low-sodium" salt (potassium chloride). **Clinical Pearls for NEET-PG:** * **DASH Diet:** High potassium intake (from GLVs and fruits) is a core component of the Dietary Approaches to Stop Hypertension (DASH) diet. * **Potassium & Processing:** Potassium is easily lost during cooking if the water used for boiling vegetables is discarded (leaching). * **Daily Requirement:** The recommended dietary allowance (RDA) for an adult is approximately **3500 mg/day**. * **Hyperkalemia Warning:** Patients with Chronic Kidney Disease (CKD) are advised to "leach" their green leafy vegetables to reduce potassium content and prevent life-threatening arrhythmias.

Question 93: What is the daily recommended intake of Vitamin A for children?

A. 40 mcg
B. 400 mcg (Correct Answer)
C. 1500 mcg
D. 5000 mcg

Explanation: **Explanation:** The daily recommended intake of Vitamin A is crucial for maintaining vision, epithelial integrity, and immune function. According to the **ICMR-NIN (2020) guidelines**, the Recommended Dietary Allowance (RDA) for Vitamin A (as Retinol) for children aged **1–9 years is 390–510 mcg/day**, making **400 mcg** the most accurate representative value among the options. * **Why 400 mcg is correct:** This value aligns with the physiological needs of a growing child to maintain serum retinol levels and prevent xerophthalmia. In the context of the Indian diet, this is achieved through a combination of preformed Vitamin A (animal sources) and Provitamin A carotenoids (plant sources). * **Why 40s mcg is incorrect:** This is far too low for any age group; even infants (0-6 months) require approximately 350 mcg/day. * **Why 1500 mcg is incorrect:** This exceeds the RDA for all pediatric age groups and approaches the Upper Tolerable Limit (UL) for younger children. * **Why 5000 mcg is incorrect:** This is a pharmacological dose, not a nutritional one. However, it is often confused with the **International Units (IU)**; 5000 IU is a common supplement strength, but in micrograms (mcg), this would be toxic if consumed daily by a child. **High-Yield Clinical Pearls for NEET-PG:** 1. **Vitamin A Prophylaxis Program:** Under the National Program, children aged 6–11 months receive a dose of **1 lakh IU**, and children aged 1–5 years receive **2 lakh IU** every 6 months (Total 9 doses). 2. **Conversion:** 1 mcg of Retinol = 3.33 IU. 3. **Earliest Sign:** Conjunctival xerosis is the earliest *objective* sign, while Night Blindness (X1A) is the earliest *symptom*. 4. **Bitot’s Spots (X1B):** These are triangular, foamy spots on the bulbar conjunctiva, a hallmark of deficiency.

Question 94: The best method to reduce radiation caries is application of viscous:

A. 0.5% neutral sodium fluoride gel
B. 1% neutral sodium fluoride gel (Correct Answer)
C. 0.5% stannous fluoride gel
D. 1% stannous fluoride gel

Explanation: ### Explanation **Concept Overview:** Radiation caries is a rapid, rampant form of dental decay that occurs in patients undergoing radiotherapy for head and neck cancers. It is primarily caused by **xerostomia** (dry mouth) resulting from radiation-induced damage to the salivary glands. Without the buffering and remineralizing capacity of saliva, tooth enamel demineralizes quickly. **Why Option B is Correct:** The gold standard for preventing and managing radiation caries is the daily application of **1% Neutral Sodium Fluoride (NaF) gel** using custom-made dental carriers (trays). * **Concentration:** 1% NaF provides a high-potency fluoride environment necessary to counteract the extreme acidogenic environment of a dry mouth. * **Neutral pH:** It is critical to use a **neutral** pH formulation because radiation patients often suffer from mucositis and thinning of the oral mucosa. Acidulated fluorides can irritate the sensitive soft tissues and may etch ceramic or composite restorations. **Analysis of Incorrect Options:** * **Options A & C (0.5% concentration):** While 0.5% fluoride is used in some prophylactic agents, it is insufficient to provide the "therapeutic" remineralization required for the aggressive nature of radiation-induced decay. * **Options C & D (Stannous Fluoride):** Stannous fluoride (SnF2) can cause extrinsic staining of the teeth and has a metallic taste that is poorly tolerated by patients already suffering from radiation-induced taste alterations (dysgeusia). **NEET-PG High-Yield Pearls:** * **Primary Cause:** The main cause of radiation caries is not the direct effect of radiation on teeth, but the **qualitative and quantitative change in saliva**. * **Application:** For maximum efficacy, the gel should be applied for **5 minutes daily** indefinitely. * **Alternative:** If 1% NaF is unavailable, 0.4% Stannous Fluoride is sometimes mentioned in older texts, but 1% Neutral NaF remains the clinical "best method." * **Osteoradionecrosis (ORN):** Always remember that extractions should be avoided post-radiation; hence, aggressive caries prevention is the priority to avoid the risk of ORN.

Question 95: Vitamin A prophylaxis is a form of:

A. Specific protection (Correct Answer)
B. Health promotion
C. Secondary prevention
D. Primordial prevention

Explanation: ### Explanation **Correct Answer: A. Specific Protection** The correct answer is **Specific Protection** because Vitamin A prophylaxis is a targeted intervention aimed at preventing a specific deficiency disease (Xerophthalmia) in a high-risk population (children aged 6 months to 5 years). In the Leavell and Clark model of the **Levels of Prevention**, Specific Protection and Health Promotion together constitute **Primary Prevention**. While health promotion is general, specific protection involves measures like immunizations, chemoprophylaxis, and nutrient supplementation to ward off a particular ailment. **Analysis of Incorrect Options:** * **B. Health Promotion:** This involves non-specific measures to improve overall well-being, such as health education, environmental sanitation, and a balanced diet. Vitamin A prophylaxis is too targeted to be classified as general health promotion. * **C. Secondary Prevention:** This focuses on **early diagnosis and prompt treatment** (e.g., screening tests). Prophylaxis occurs *before* the onset of disease, making it primary, not secondary. * **D. Primordial Prevention:** This aims to prevent the emergence of risk factors (e.g., discouraging children from starting smoking). Since Vitamin A deficiency is an existing risk factor in the community, prophylaxis is primary prevention. **High-Yield Clinical Pearls for NEET-PG:** * **National Vitamin A Prophylaxis Programme:** * **Total Doses:** 9 doses are given until 5 years of age. * **Schedule:** 1st dose at 9 months (with Measles/MR vaccine) = **1 lakh IU**. * **Subsequent doses:** Every 6 months (2nd to 9th dose) = **2 lakh IU** each. * **Total cumulative dose:** 17 lakh IU. * **WHO Classification:** Bitot’s spots (X1B) are the most frequent objective sign, while Night Blindness (XN) is the earliest symptom. * **Treatment Dose:** If a child is diagnosed with Xerophthalmia, the schedule is: Day 0, Day 1, and Day 14 (3 doses total).

Question 96: How is protein assessed?

A. Protein energy ratio (Correct Answer)
B. Blood Urea Nitrogen (BUN)
C. Calories per gram of protein provided
D. Amino acid score

Explanation: **Explanation:** The assessment of protein in a population's diet involves evaluating both the quantity and the quality of protein relative to total energy intake. **1. Why "Protein Energy Ratio" is correct:** The **Protein Energy Ratio (PE Ratio)** is the standard epidemiological tool used to assess the protein content of a diet. It is calculated as: *[(Energy from protein in kcal) / (Total energy in kcal)] × 100*. For a balanced diet, the WHO recommends a PE ratio of approximately **10–12%**. This ratio is crucial because if total calorie intake is inadequate, the body diverts protein to be used as an energy source (gluconeogenesis) rather than for tissue building. Therefore, protein adequacy cannot be assessed in isolation from total energy. **2. Why the other options are incorrect:** * **Blood Urea Nitrogen (BUN):** This is a clinical biochemical marker used to assess renal function or hydration status, not a method for assessing dietary protein adequacy in a population. * **Calories per gram of protein:** While protein provides 4 kcal/gram, this is a constant physiological fuel value and not a method of assessment. * **Amino Acid Score:** This measures **protein quality** (the limiting amino acid compared to a reference protein like egg) rather than assessing the overall protein status of a diet or individual. **High-Yield Clinical Pearls for NEET-PG:** * **Net Protein Utilization (NPU):** The best biological index for protein quality (NPU = Biological Value × Digestibility Coefficient). * **Reference Protein:** Egg protein is considered the "standard" with a biological value of 100. * **Limiting Amino Acids:** Pulses are deficient in **Methionine**, while Cereals are deficient in **Lysine**. This is why a cereal-pulse combination (ratio 4:1) improves protein quality. * **Safe Intake:** For an average adult, the RDA is **0.83 g/kg body weight/day**.

Question 97: Rice is poor in all except which of the following?

A. Calcium
B. Iron
C. Vitamin A, D, C
D. Lysine (Correct Answer)

Explanation: **Explanation:** The question asks which nutrient rice is **not** poor in (i.e., what it contains in relatively better amounts compared to the other options). **1. Why Lysine is the Correct Answer:** Cereals, including rice, are primarily composed of carbohydrates (70-80%) and proteins (7-12%). While rice is famously deficient in the amino acid **Lysine**, it is actually **richer in Lysine** compared to other cereals like wheat or maize. In the context of this question, rice is "poor" in almost all micronutrients (Vitamins and Minerals), but among the choices provided, it contains a measurable amount of Lysine (approx. 3.8g/100g of protein), whereas it contains virtually **zero** Vitamin A, C, and D, and negligible amounts of Calcium and Iron. **2. Analysis of Incorrect Options:** * **Option A & B (Calcium and Iron):** Rice is a very poor source of minerals. Most of the minerals are located in the outer bran layer, which is removed during milling and polishing. * **Option C (Vitamin A, D, C):** All cereals, including rice, are naturally devoid of Vitamin A (except yellow maize), Vitamin D, and Vitamin C. These are "absolute" deficiencies. **3. High-Yield Clinical Pearls for NEET-PG:** * **The Rice Paradox:** Although rice has less total protein (7%) than wheat (12%), **Rice Protein (Oryzenin)** is of better biological quality because it has a higher Lysine content. * **Limiting Amino Acids:** The limiting amino acid in Rice/Cereals is **Lysine**. The limiting amino acid in Pulses is **Methionine**. * **Milling & Parboiling:** Polishing rice removes Thiamine (Vit B1), leading to **Beriberi**. **Parboiling** (a process of soaking and steaming) helps conserve B-vitamins by driving them from the husk into the grain. * **Reference:** Rice is also a poor source of Fat and Iodine.

Question 98: Which of the following decreases plaque formation and is therefore anticariogenic?

A. Ammonia
B. Urea
C. Chlorophyll, Nitrofurans
D. All of the above (Correct Answer)

Explanation: ### Explanation Dental caries is a multifactorial disease caused by the interaction of dietary sugars, plaque-forming bacteria (like *Streptococcus mutans*), and a susceptible host. **Anticariogenic agents** are substances that prevent, arrest, or reverse the caries process by interfering with plaque formation or neutralizing acids. **Mechanism of Action for the Options:** 1. **Ammonia and Urea:** These are alkaline substances. When urea is hydrolyzed by oral bacteria, it releases ammonia, which raises the pH of the dental plaque. This neutralization of acids prevents the demineralization of enamel and inhibits the growth of acidophilic (acid-loving) cariogenic bacteria. 2. **Chlorophyll:** It acts as an antibacterial agent and an enzyme inhibitor. It helps in reducing the bacterial load in the oral cavity and interferes with the synthesis of polysaccharides required for plaque biofilm formation. 3. **Nitrofurans:** These are potent antimicrobial agents. In the context of oral health, they inhibit the metabolic activity of plaque-forming bacteria, thereby reducing the volume and pathogenicity of the plaque. Since all three categories of substances contribute to reducing plaque or neutralizing the acidic environment conducive to decay, **Option D (All of the above)** is the correct answer. ### High-Yield Clinical Pearls for NEET-PG: * **Fluoride:** The most important anticariogenic agent. It works by forming **Fluorapatite** (more resistant to acid than hydroxyapatite) and inhibiting the enzyme **enolase** in bacterial glycolysis. * **Vitamins:** Vitamin D and Vitamin A are essential for normal tooth development and enamel formation. * **Dietary Factors:** High-fiber foods (detergent action) and phosphates (buffering capacity) are protective, while sucrose is the most cariogenic sugar. * **Stephan Curve:** Describes the rapid drop in plaque pH after eating sugar and its gradual recovery; anticariogenic agents help keep the pH above the **critical level (5.5)**.

Question 99: Which of the following contains a high proportion of saturated fatty acids?

A. Coconut oil (Correct Answer)
B. Sunflower oil
C. Safflower oil
D. Soybean oil

Explanation: **Explanation:** The correct answer is **Coconut oil**. In the context of Community Medicine and Nutrition, fats are classified based on their degree of saturation. **Saturated Fatty Acids (SFA)** are those that contain no double bonds between carbon atoms and are typically solid at room temperature (with the exception of tropical oils). **Why Coconut Oil is Correct:** Coconut oil is unique among plant-based oils because it is exceptionally high in saturated fats (approximately **92%**). It primarily consists of medium-chain triglycerides (MCTs) like lauric acid. Despite being a vegetable oil, its high SFA content makes it highly resistant to oxidation but also a significant contributor to raising LDL cholesterol if consumed in excess. **Why the Other Options are Incorrect:** * **Sunflower oil, Safflower oil, and Soybean oil** are all categorized as **Polyunsaturated Fatty Acids (PUFA)**. * **Safflower oil** has the highest PUFA content (about 75%), followed by sunflower oil. * **Soybean oil** contains a mix of PUFA (Linoleic acid) and some Omega-3 (Alpha-linolenic acid). * Vegetable oils rich in PUFA are generally recommended in public health to replace SFAs to reduce the risk of Cardiovascular Diseases (CVD). **High-Yield NEET-PG Pearls:** 1. **Highest SFA Content:** Coconut oil (~92%) > Palm kernel oil. 2. **Highest PUFA Content:** Safflower oil (~75%) > Sunflower oil (~65%) > Corn oil. 3. **Highest MUFA (Monounsaturated) Content:** Olive oil (~75%) > Groundnut oil. 4. **Essential Fatty Acids:** Linoleic acid (Omega-6) and Alpha-linolenic acid (Omega-3) cannot be synthesized by the body and must be obtained from the diet. 5. **P/S Ratio:** For a balanced diet, the recommended Polyunsaturated to Saturated fat ratio is **0.8 to 1.0**.

Question 100: What is the ideal cholesterol level?

A. 100 mg/dL
B. 200 mg/dL (Correct Answer)
C. 150 mg/dL
D. 250 mg/dL

Explanation: **Explanation:** In the context of Community Medicine and Cardiovascular health, the "ideal" or "desirable" level for **Total Serum Cholesterol** is defined as **less than 200 mg/dL**. This threshold is based on epidemiological studies (like the Framingham Heart Study) which demonstrate that the risk of Atherosclerotic Cardiovascular Disease (ASCVD) increases significantly as levels rise above this point. * **Why 200 mg/dL is correct:** According to the NCEP (National Cholesterol Education Program) ATP III guidelines, a total cholesterol level of **<200 mg/dL** is classified as **Desirable**. Levels between 200–239 mg/dL are "Borderline High," and ≥240 mg/dL are "High." * **Why other options are incorrect:** * **100 mg/dL:** While lower is often better for LDL, a total cholesterol of 100 mg/dL is unusually low for an adult and is not the standard clinical benchmark for "ideal" total cholesterol. * **150 mg/dL:** This is often cited as the ideal level for **Triglycerides**, not total cholesterol. * **250 mg/dL:** This level is classified as **High** and is associated with a significantly increased risk of coronary artery disease and stroke. **High-Yield Clinical Pearls for NEET-PG:** * **LDL (The "Bad" Cholesterol):** The primary target of therapy. Ideal is **<100 mg/dL**. * **HDL (The "Good" Cholesterol):** Protective against heart disease. Low HDL is **<40 mg/dL**; High (protective) is **>60 mg/dL**. * **Triglycerides:** Normal level is **<150 mg/dL**. * **Friedewald Formula:** LDL = Total Cholesterol – HDL – (Triglycerides/5). *Note: This formula is invalid if Triglycerides are >400 mg/dL.*

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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