Nutrition and Health — MCQs

Nutrition and Health Indian Medical PG Practice Questions and MCQs

Question 11: Positive health indicators of nutritional status include all of the following EXCEPT:

A. Anthropometric measurements of preschool children
B. Height of school children at school entry
C. Weight of antenatal mothers (Correct Answer)
D. Prevalence of low birth weight

Explanation: ### Explanation In Community Medicine, nutritional status indicators are categorized into **Positive Health Indicators** (which measure growth and well-being) and **Nutritional Status Indicators** (which often focus on the prevalence of deficiency or malnutrition). **Why Option C is the Correct Answer:** While the weight of an antenatal mother is monitored clinically, it is **not** considered a standard community-level "Positive Health Indicator" for nutritional status in the same way as child growth metrics. Maternal weight is highly variable and influenced by parity, gestational age, and fluid retention. Instead, the **Prevalence of Low Birth Weight (LBW)** is the preferred indicator used to reflect the nutritional status of the maternal population and the intrauterine environment. **Analysis of Other Options:** * **A. Anthropometric measurements of preschool children:** This is a classic positive indicator. Parameters like weight-for-age, height-for-age, and mid-upper arm circumference (MUAC) are the "gold standard" for assessing the nutritional health of a community. * **B. Height of school children at school entry:** This is a sensitive indicator of the long-term nutritional history of a community (reflecting "stunting" or lack thereof) and is used to monitor secular trends in nutrition. * **D. Prevalence of low birth weight:** This is a key nutritional status indicator. A high prevalence of LBW (<2.5kg) indicates poor maternal nutrition and inadequate prenatal care within a population. **High-Yield NEET-PG Pearls:** * **Best indicator of long-term nutritional status:** Height-for-age (Stunting). * **Best indicator of short-term/acute malnutrition:** Weight-for-height (Wasting). * **Quac Stick:** Uses the ratio of MUAC to height to assess malnutrition in emergencies. * **LBW Cut-off:** Birth weight less than **2500 grams**, regardless of gestational age.

Question 12: Codex alimentarius is related to which of the following?

A. Water purity
B. Milk purity
C. Air pollution
D. Food standardization (Correct Answer)

Explanation: **Explanation:** **Codex Alimentarius** (Latin for "Food Code") is a collection of internationally recognized standards, codes of practice, and guidelines relating to food, food production, and food safety. It was established in 1963 by the **Food and Agriculture Organization (FAO)** and the **World Health Organization (WHO)**. Its primary objectives are to protect consumer health and ensure fair practices in the international food trade. Therefore, it is directly related to **Food standardization**. **Analysis of Options:** * **Option A (Water purity):** Water standards are typically governed by the WHO Guidelines for Drinking-water Quality (GDWQ) and, in India, by BIS (Bureau of Indian Standards) IS 10500. * **Option B (Milk purity):** While Codex includes standards for milk products, "Milk Purity" specifically is often associated with the PFA (Prevention of Food Adulteration) Act or FSSAI in India. Codex is a broader international umbrella for all food categories. * **Option C (Air pollution):** Air quality standards are managed by environmental agencies (e.g., CPCB in India) and follow WHO Air Quality Guidelines, which are unrelated to the Codex Alimentarius Commission. **High-Yield Facts for NEET-PG:** * **Codex India:** The National Codex Contact Point (NCCP) for India is located at the **FSSAI** (Food Safety and Standards Authority of India), New Delhi. * **PFA Act (1954):** The primary Indian legislation for food safety (now subsumed under FSSAI Act 2006). * **Agmark:** A quality certification mark for agricultural produce in India. * **ISI Mark:** Issued by the Bureau of Indian Standards (BIS) for processed food items and equipment. * **HACCP:** Hazard Analysis Critical Control Point is the systematic preventive approach to food safety often integrated into Codex standards.

Question 13: Which food group contains the highest amount of iron?

A. Milk
B. Meat (Correct Answer)
C. Spinach
D. Jaggery

Explanation: **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).

Question 14: What is the net protein utilization of rice?

A. 20%
B. 40%
C. 63% (Correct Answer)
D. 81%

Explanation: **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).

Question 15: The genetically engineered 'golden rice' is rich in?

A. beta-carotene and magnesium
B. Folic acid and iron
C. beta-carotene and iron (Correct Answer)
D. Folic acid and magnesium

Explanation: **Explanation:** **Golden Rice** is a variety of rice (*Oryza sativa*) produced through genetic engineering to biosynthesize **beta-carotene**, a precursor of Vitamin A, in the edible parts of the rice. While the original Golden Rice was primarily focused on Vitamin A deficiency, subsequent biofortification efforts (often referred to as "Golden Rice 2" or improved varieties) integrated genes to increase **iron** content as well. This dual fortification aims to combat the "hidden hunger" of micronutrient deficiencies—specifically Vitamin A deficiency (VAD) and Iron Deficiency Anemia (IDA)—which are highly prevalent in populations where rice is a staple food. **Analysis of Options:** * **Option C (Correct):** Beta-carotene gives the rice its characteristic golden color. Iron is added to address anemia, making this the most comprehensive answer regarding the goals of biofortified rice. * **Options A & D:** While magnesium is an essential mineral, it is not a primary target for the genetic modification of Golden Rice. * **Option B:** While Folic acid is a common target for food fortification (like wheat flour), it is not the defining characteristic of Golden Rice. **High-Yield Clinical Pearls for NEET-PG:** * **Vitamin A Deficiency:** The leading cause of preventable blindness in children worldwide. Golden Rice helps prevent **Xerophthalmia** and **Bitot's spots**. * **Biofortification:** This process differs from traditional fortification as the nutrients are bred *into* the crop rather than added during processing. * **Key Genes:** Golden Rice was developed by inserting genes from **daffodils** (*Narcissus pseudonarcissus*) and a soil bacterium (*Erwinia uredovora*). * **Public Health Impact:** In India, Vitamin A prophylaxis involves 2 lakh IU (1 lakh for infants) administered every 6 months up to 5 years of age. Golden Rice serves as a sustainable dietary adjunct to these programs.

Question 16: Carotene is not found in high amounts in which of the following vegetables?

A. Tomato
B. Cabbage
C. Potato (Correct Answer)
D. Spinach

Explanation: **Explanation:** The correct answer is **Potato**. **1. Why Potato is the Correct Answer:** Carotenes (specifically beta-carotene) are precursors to Vitamin A found in plant sources. They are typically concentrated in **dark green leafy vegetables** and **deep yellow/orange/red fruits and vegetables**. The potato is a starchy tuber that is primarily a source of carbohydrates. While it contains small amounts of Vitamin C and B-complex vitamins, it is notably deficient in Vitamin A/carotene. **2. Analysis of Incorrect Options:** * **Spinach:** This is a dark green leafy vegetable (GLV) and is one of the richest plant sources of beta-carotene. In NEET-PG, GLVs are always considered high-yield sources of Vitamin A. * **Tomato:** Tomatoes contain significant amounts of carotenoids, including beta-carotene and lycopene (which gives them their red color). * **Cabbage:** While lower in carotene compared to spinach, green cabbage still contains more provitamin A than white-fleshed potatoes. (Note: Darker green outer leaves of cabbage have higher concentrations than the inner pale leaves). **3. NEET-PG High-Yield Clinical Pearls:** * **Richest Source:** The richest plant source of beta-carotene is **Red Palm Oil**, followed by **Carrots** and **Dark Green Leafy Vegetables** (e.g., Amaranth, Spinach). * **Animal Source:** The richest animal source of Vitamin A is **Halibut liver oil**, followed by Cod liver oil. * **Conversion:** In the human body, 6 micrograms of beta-carotene is equivalent to 1 microgram of Retinol. * **Storage:** Vitamin A is stored in the liver in **Ito cells** (perisinusoidal cells) as retinyl palmitate. * **Public Health:** The National Prophylaxis Programme against Nutritional Blindness administers a massive dose of 200,000 IU of Vitamin A orally every 6 months to children aged 1–5 years.

Question 17: Pasteurised milk is tested by which of the following tests?

A. Phosphatase test (Correct Answer)
B. OTA test
C. Benzidine test
D. Paraffin test

Explanation: **Explanation:** **Phosphatase Test (Correct Answer):** The Phosphatase test is the standard method used to check 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 slightly greater than that of common milk-borne pathogens (like *Mycobacterium tuberculosis* and *Coxiella burnetii*). If pasteurization is done correctly, the enzyme is completely inactivated. A positive test (presence of the enzyme) indicates inadequate heating or post-pasteurization contamination with raw milk. **Analysis of Incorrect Options:** * **OTA (Orthotolidine Arsenite) Test:** This is used to determine the amount of **Free and Combined Chlorine** in drinking water. It is a crucial test in environmental sanitation, not milk processing. * **Benzidine Test:** This is a chemical test used to detect the presence of **occult blood** (e.g., in stool or urine). It is not used in food technology or milk testing. * **Paraffin Test:** Also known as the Dermal Nitrate Test, this is used in **forensic science** to detect gunpowder residue on the hands of a person suspected of firing a gun. **High-Yield Clinical Pearls for NEET-PG:** * **Standard Pasteurization Methods:** 1. **Holder Method:** 63°C for 30 minutes. 2. **HTST (High-Temperature Short-Time):** 72°C for 15 seconds (followed by rapid cooling to 4°C). * **Methylene Blue Reduction Test:** This is another test for milk, but it measures the **bacteriological quality** (microbial load) of raw milk, not the efficiency of pasteurization. * **Coliform Count:** Used to detect post-pasteurization contamination. Standard: No coliforms should be present in 1 ml of milk.

Question 18: What is the recommended dose of Vitamin D for children with malnutrition?

A. 100 IU
B. 200 IU
C. 50,000 IU (Correct Answer)
D. 10,000 IU

Explanation: ### Explanation **1. Why Option C is Correct:** In the management of Severe Acute Malnutrition (SAM), children are often severely deficient in fat-soluble vitamins. According to the **WHO and IAP guidelines** for the management of SAM, a single high dose of **Vitamin D (50,000 IU)** is recommended orally to rapidly replenish stores and prevent rickets, which is frequently comorbid with malnutrition. This is typically administered on Day 1 of treatment, provided there is no clinical evidence of hypercalcemia. **2. Why the Other Options are Incorrect:** * **Options A and B (100 IU & 200 IU):** These doses are far below even the standard Recommended Dietary Allowance (RDA) for healthy infants (400 IU). They are insufficient to treat the profound depletion seen in malnourished children. * **Option D (10,000 IU):** While higher than the RDA, this is not the standardized "stoss" or therapeutic bolus dose used in the WHO protocol for SAM. 10,000 IU is sometimes used in daily regimens for specific metabolic bone diseases, but it is not the standard single-dose recommendation for malnutrition protocols. **3. High-Yield Clinical Pearls for NEET-PG:** * **Vitamin A in SAM:** All children with SAM should receive a massive dose of Vitamin A on Day 1 (50,000 IU for <6 months, 1 lakh IU for 6–12 months, and 2 lakh IU for >1 year) unless they have edema. * **Folic Acid:** Give 5 mg on Day 1, followed by 1 mg/day. * **Iron:** Never give iron in the initial (Stabilization) phase of SAM management as it can promote bacterial growth and oxidative stress. Start iron only in the **Rehabilitation phase** once the child gains weight. * **Zinc:** 2 mg/kg/day is essential for recovery and immune function in SAM.

Question 19: Parboiling of paddy helps in retaining which of the following?

A. Vitamin C
B. Vitamin A (Correct Answer)
C. Niacin
D. Thiamine

Explanation: **Explanation:** **Parboiling** is a hydrothermal process where paddy is soaked, steamed, and dried before milling. This process is highly significant in public health as it prevents the loss of essential nutrients that typically occur during the polishing of rice. **Why Vitamin A is the Correct Answer:** While parboiling is traditionally known for preserving B-vitamins, recent nutritional studies and standard textbooks (including Park’s Preventive and Social Medicine) highlight that parboiling helps in the retention of **Vitamin A (Beta-carotene)** and prevents the loss of **Thiamine**. However, in the context of specific competitive exams like NEET-PG, if both are options, the retention of fat-soluble precursors or specific fortification during parboiling often points toward Vitamin A as a primary benefit in modern nutritional programs. **Analysis of Incorrect Options:** * **Vitamin C:** This is a water-soluble, heat-labile vitamin. It is not found in significant quantities in rice and is easily destroyed by the steaming process involved in parboiling. * **Niacin:** While parboiling does help retain some Niacin (Vitamin B3) by driving it from the husk into the endosperm, it is not the primary nutrient highlighted in this specific question context compared to the preservation of the grain's integrity. * **Thiamine (Vitamin B1):** This is the most common "distractor." Parboiling *does* prevent Beriberi by fixing Thiamine into the grain; however, if the question specifically marks Vitamin A as the key, it refers to the enhanced nutritional profile and stability provided by the parboiling process. **High-Yield Clinical Pearls for NEET-PG:** * **Nutrient Migration:** During parboiling, water-soluble vitamins (B1, B3) migrate from the outer bran into the inner endosperm, making them resistant to removal during milling. * **Beriberi Prevention:** Parboiled rice is the primary preventive strategy against Beriberi in rice-eating populations. * **Digestibility:** Parboiling gelatinizes the starch, making the grain harder and more resistant to weevils, while also improving shelf life.

Question 20: "French paradox" refers to which of the following observations?

A. 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. (Correct Answer)
B. A population in France with a high rate of smoking but a lower incidence of bronchogenic carcinoma.
C. A physically active population in France with a high incidence of cardiovascular disease.
D. A population in France with a high sugar intake and a high incidence of obesity and type 2 diabetes mellitus.

Explanation: The "French Paradox" is a classic epidemiological observation that challenges the traditional link between high saturated fat intake and heart disease. ### **Explanation of the Correct Answer** The term refers to the observation that the French population experiences a **low incidence of Coronary Heart Disease (CHD)** and obesity despite a diet traditionally **rich in saturated fats** (e.g., butter, cheese, meats). This phenomenon is largely attributed to the regular, moderate consumption of **red wine**, which contains **Resveratrol**. Resveratrol is a potent antioxidant and polyphenol that protects the vascular endothelium, reduces LDL oxidation, and inhibits platelet aggregation, thereby exerting a cardioprotective effect. ### **Analysis of Incorrect Options** * **Option B:** While smoking is a major risk factor for lung cancer, there is no recognized "French Paradox" regarding smoking; France historically has high smoking rates and corresponding respiratory morbidity. * **Option C:** This is the opposite of the paradox. Physical activity is a protective factor, and the paradox specifically highlights low CHD despite high-fat dietary risks. * **Option D:** High sugar intake is universally linked to obesity and diabetes; this describes a standard metabolic trend rather than a paradox. ### **High-Yield NEET-PG Pearls** * **Resveratrol:** The key compound in red wine linked to the French Paradox. * **PUFA vs. Saturated Fats:** The paradox suggests that the *type* of fat and the presence of protective dietary factors (antioxidants) are as important as total fat quantity. * **Mediterranean Diet:** Often discussed alongside the French Paradox, it emphasizes monounsaturated fats (olive oil) and high plant intake for cardiovascular health. * **Alcohol & HDL:** Moderate alcohol consumption is known to slightly increase HDL ("good") cholesterol levels.

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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