Nutrition and Health — MCQs

Nutrition and Health Indian Medical PG Practice Questions and MCQs

Question 471: What is the recommended daily percentage of total energy intake from fat?

A. 10%
B. 15% (Correct Answer)
C. 20%
D. 25%

Explanation: **Explanation:** The correct answer is **15% (Option B)**. This recommendation is based on the guidelines provided by the World Health Organization (WHO) and the Indian Council of Medical Research (ICMR) for a balanced diet in adults. **1. Why 15% is Correct:** According to standard nutritional guidelines, the **minimum** requirement for total fat intake to ensure the supply of essential fatty acids and the absorption of fat-soluble vitamins (A, D, E, K) is **15% of the total daily energy intake**. For most healthy sedentary adults, the recommended range is 15% to 30%. In the context of competitive exams like NEET-PG, when a single value is asked for the lower limit or the baseline recommendation for a balanced diet, 15% is the established benchmark. **2. Analysis of Incorrect Options:** * **Option A (10%):** This is too low. An intake below 15% may lead to deficiencies in essential fatty acids and impaired absorption of fat-soluble vitamins. * **Option C (20%) & D (25%):** While these values fall within the "healthy range" (15-30%), they represent an optimal or higher intake rather than the baseline recommended minimum percentage often tested in public health statistics. **3. High-Yield Clinical Pearls for NEET-PG:** * **Total Energy Distribution:** A balanced diet typically consists of Carbohydrates (50-70%), Fats (15-30%), and Proteins (10-15%). * **Saturated Fats:** Should constitute less than **10%** of total energy intake to reduce cardiovascular risk. * **Energy Density:** Fat is the most energy-dense macronutrient, providing **9 kcal/gram**, compared to 4 kcal/gram for proteins and carbohydrates. * **Essential Fatty Acids:** Linoleic acid (Omega-6) and Alpha-linolenic acid (Omega-3) must be provided by the diet as the body cannot synthesize them.

Question 472: Which two elements are typically found in 'iodized salt'?

A. Iodine and Fluorine
B. Iodine and Calcium
C. Iodine and Iron (Correct Answer)
D. Iodine and Chlorine

Explanation: **Explanation:** The correct answer is **Iodine and Iron**. This refers to **Double Fortified Salt (DFS)**, a public health intervention designed to simultaneously address two of the most prevalent micronutrient deficiencies in India: Iodine Deficiency Disorders (IDD) and Iron Deficiency Anemia (IDA). 1. **Why it is correct:** DFS is a specialized salt formulation containing both **Potassium Iodate** and **Ferrous Fumarate** (or encapsulated Ferrous Sulfate). The challenge in DFS is preventing the chemical reaction between iodine and iron, which can cause discoloration and iodine loss; this is solved using micro-encapsulation technology. It is a key strategy under the *Anemia Mukt Bharat* strategy and the *National Iron Plus Initiative*. 2. **Why other options are incorrect:** * **Option A (Fluorine):** While water fluoridation exists, salt is rarely used as a vehicle for fluorine in India. In fact, many regions in India struggle with *excess* fluoride (Fluorosis). * **Option B (Calcium):** Calcium is not typically added to salt. It is usually supplemented through tablets or dietary diversification (dairy, ragi). * **Option D (Chlorine):** Chlorine is a natural constituent of salt (Sodium Chloride). "Iodized salt" refers to the fortification of NaCl with an external element, not its inherent components. **High-Yield Clinical Pearls for NEET-PG:** * **Iodization Level:** At the production level, salt must contain **30 ppm** of iodine, and at the consumer level, at least **15 ppm**. * **Storage:** Iodized salt should be stored in a cool, dry place and in a closed container to prevent iodine loss via sublimation. * **Monitoring:** The **Standard Methylene Blue Test** or portable **Spot Testing Kits (STK)** are used to check iodine content at the household level. * **DFS Composition:** Typically contains 1 mg of Iron per 1 gram of salt (1000 ppm Iron) and 30 ppm Iodine.

Question 473: In which food item is iron content highest?

A. Pista
B. Cashewnut
C. Meat (Correct Answer)
D. Milk

Explanation: **Explanation:** The correct answer is **Meat**. This question tests the understanding of iron bioavailability and content across different food groups. **1. Why Meat is Correct:** While some plant-based sources may have high absolute iron values on paper, **Meat** (especially organ meats like liver and red meat) is the superior source because it contains **Heme Iron**. Heme iron is highly bioavailable (15-35% absorption) and its absorption is not inhibited by dietary factors like phytates or tannins. In contrast, plant sources contain Non-Heme iron, which has a much lower absorption rate (2-10%). **2. Analysis of Incorrect Options:** * **Pista & Cashewnut:** These are good sources of minerals and fats, but their iron is **Non-Heme**. Furthermore, nuts contain phytates which act as "anti-nutrients," further inhibiting the absorption of the iron they do contain. * **Milk:** Milk is notoriously **poor in iron**. It is often referred to as a "nearly complete food," but its primary deficiencies are Iron and Vitamin C. Excessive cow's milk intake in infants is a common clinical cause of iron-deficiency anemia. **3. NEET-PG High-Yield Pearls:** * **Richest Source:** The richest overall source of iron is **Dhania (Coriander) seeds**, followed by dry lotus stems and green leafy vegetables (like Amaranth). * **Animal Sources:** Liver is the richest animal source. * **Promoters of Absorption:** Vitamin C (Ascorbic acid) and "Meat Factor" enhance non-heme iron absorption. * **Inhibitors of Absorption:** Phosphates, Phytates (cereals), Oxalates (spinach), and Tannins (tea/coffee). * **Public Health Note:** Under the *Anemia Mukt Bharat* strategy, iron-folic acid (IFA) supplementation is the primary intervention for vulnerable groups.

Question 474: How can the efficiency of a goiter control program be assessed?

A. Neonatal thyroxine levels (Correct Answer)
B. Goitre in pregnancy
C. Goitre in the age group of 12 to 18 years
D. Soil iodine levels

Explanation: ### Explanation The efficiency of a Goiter Control Program (National Iodine Deficiency Disorders Control Programme - NIDDCP) is best assessed by monitoring the most sensitive indicators of iodine status in a population. **Why Option A is Correct:** **Neonatal Thyroxine (T4) or TSH levels** are considered the most sensitive indicators for monitoring the impact of iodine control programs. The fetal and neonatal thyroid is highly sensitive to iodine deficiency. Even mild iodine deficiency during pregnancy can lead to neonatal hypothyroidism. Measuring neonatal thyroid function provides a "real-time" assessment of the current iodine status of the community, reflecting the immediate success of salt iodization efforts. **Analysis of Incorrect Options:** * **Option B & C:** While goiter prevalence in pregnant women or school-age children (traditionally 6–12 years) is used to determine the **severity** of endemicity in an area, it is a "lagging indicator." Goiter (thyroid enlargement) takes time to develop and time to regress; therefore, it does not reflect immediate changes in the program's efficiency as accurately as neonatal screening. * **Option D:** Soil iodine levels indicate the environmental risk of iodine deficiency but do not measure the biological impact or the success of the intervention (iodized salt consumption) on the human population. **High-Yield Facts for NEET-PG:** * **Most sensitive indicator for IDD monitoring:** Neonatal TSH/T4 levels. * **Best indicator for current iodine intake:** Urinary Iodine Excretion (UIE). A median UIE of **100–199 µg/L** in school-age children indicates adequate iodine intake. * **NIDDCP Goal:** To reduce the prevalence of goiter to **below 5%** in the community. * **Iodine Content in Salt:** 30 ppm at the production level and 15 ppm at the consumer level.

Question 475: What is the approximate protein content of rice?

A. 6% (Correct Answer)
B. 12%
C. 14%
D. 0.6%

Explanation: **Explanation:** The protein content of cereals is a high-yield topic in Community Medicine. Rice, while being the staple food for a large portion of the population, has the **lowest protein content** among common cereals, typically ranging between **6% to 7%**. **Why Option A is correct:** Rice contains approximately 6-7 grams of protein per 100 grams. Despite its lower quantity compared to wheat, rice protein is considered to be of **higher biological value** because it contains a better balance of essential amino acids, particularly a higher lysine content than other cereals. **Analysis of Incorrect Options:** * **Option B (12%):** This is the approximate protein content of **Wheat** (11.8% to 12%). Wheat is richer in protein but contains gluten and has a lower biological value than rice protein. * **Option C (14%):** This value is too high for common cereals. Some varieties of pulses or specific millets may approach this, but it does not represent rice. * **Option D (0.6%):** This is an underestimate. While rice is predominantly carbohydrate (approx. 70-80%), its protein fraction is significant enough to contribute to daily requirements in cereal-based diets. **High-Yield Clinical Pearls for NEET-PG:** * **Limiting Amino Acid:** Like most cereals, rice is deficient in **Lysine** (though it has more than wheat) and rich in **Methionine**. * **Net Protein Utilization (NPU):** Rice has a high NPU (approx. 65) compared to wheat (approx. 49). * **Milling & Parboiling:** Excessive milling removes the aleurone layer, leading to loss of B-vitamins (Thiamine) and proteins. **Parboiling** helps retain these nutrients by driving them into the endosperm. * **Reference Protein:** Egg is considered the reference protein with a biological value of 100.

Question 476: Jaggery contains a good amount of which of the following?

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

Explanation: **Explanation:** **Correct Answer: C. Iron** Jaggery (Gur) is a traditional non-centrifugal cane sugar widely used in India. It is considered a nutritionally superior alternative to refined white sugar because it retains its mineral content during processing. The primary reason for its high **Iron** content is the traditional manufacturing process, where sugarcane juice is boiled in large **iron vessels**. During this evaporation process, a significant amount of iron leaches from the pans into the jaggery. It contains approximately **11 mg of iron per 100 grams**, making it a valuable dietary source for preventing nutritional anemia, particularly in rural populations. **Analysis of Incorrect Options:** * **A. Vitamin C:** Jaggery is produced by prolonged heating and boiling of sugarcane juice. Vitamin C is heat-labile (destroyed by heat) and is virtually absent in jaggery. * **B. Calcium:** While jaggery does contain trace amounts of minerals like calcium, potassium, and magnesium, it is specifically recognized in public health and nutrition as a potent source of **Iron**, not calcium. * **D. Vitamin D:** Vitamin D is primarily synthesized in the skin via UV radiation or found in animal-based fatty foods and fortified products. It is not found in plant-based sweeteners like jaggery. **High-Yield NEET-PG Pearls:** * **Iron Source:** Jaggery is often recommended in the National Nutritional Anemia Prophylaxis Programme as a dietary supplement. * **Energy Value:** 1 gram of jaggery provides approximately **4 kcal**, similar to sugar, but with added micronutrients. * **Comparison:** Unlike refined sugar (which provides "empty calories"), jaggery is a complex carbohydrate that digests slower and provides sustained energy. * **Other Minerals:** It is also a good source of **Magnesium** (helps in relaxation of muscles) and **Potassium**.

Question 477: Nutritional status of a community is measured by all of the following except:

A. Anemia detection in pregnancy
B. Mid-arm circumference in the 0-1 year age group (Correct Answer)
C. Child birth weight less than 2500 grams
D. Height and weight calculated in the less than 5 years age group

Explanation: The nutritional status of a community is assessed using specific anthropometric and biochemical indicators. The correct answer is **B** because of the specific age group mentioned. ### Why Option B is the Correct Answer (The "Except") Mid-Upper Arm Circumference (MUAC) is a reliable indicator of muscle mass and protein-energy malnutrition. However, it is relatively constant between the ages of **1 to 5 years**. In infants **under 1 year of age**, MUAC is not a reliable screening tool because the rapid physiological changes in subcutaneous fat and muscle during the first year make the measurements difficult to standardize for malnutrition screening. ### Analysis of Other Options * **A. Anemia detection in pregnancy:** This is a vital biochemical indicator of the nutritional status of a community. High rates of maternal anemia reflect poor iron and folic acid intake and are a proxy for the overall nutritional health of the adult population. * **C. Child birth weight < 2500g:** Low Birth Weight (LBW) is a key "impact indicator." It reflects the maternal nutritional status during pregnancy and is a strong predictor of the community's health and future child survival. * **D. Height and weight in < 5 years:** These are the gold standard anthropometric measurements. Weight-for-age (underweight), Height-for-age (stunting), and Weight-for-height (wasting) are the primary indices used to monitor community nutrition. ### High-Yield NEET-PG Pearls * **MUAC Cut-offs (1–5 years):** * < 11.5 cm: Severe Acute Malnutrition (SAM) * 11.5 – 12.5 cm: Moderate Acute Malnutrition (MAM) * > 13.5 cm: Normal * **Quac Stick:** A method used to measure MUAC-for-height. * **Best Indicator of Social Development:** Stunting (Height-for-age) reflects chronic malnutrition. * **Best Indicator of Current Nutritional Status:** Wasting (Weight-for-height) reflects acute malnutrition.

Question 478: What are the recommended daily extra calories for the second and third trimesters of pregnancy?

A. 150 kCals
B. 200 kCals
C. 350 kCals (Correct Answer)
D. 250 kCals

Explanation: **Explanation:** The nutritional requirements during pregnancy increase significantly to support fetal growth, placental development, and maternal physiological changes. According to the **ICMR-NIN (2020) guidelines**, the energy requirement for a pregnant woman is calculated as her pre-pregnancy Sedentary/Moderate/Heavy work requirement **plus** an additional allowance. 1. **Why 350 kCals is correct:** For the **second trimester**, an additional **350 kcal/day** is recommended. For the **third trimester**, the recommendation remains **350 kcal/day** (though some older guidelines suggested 450 kcal, the current ICMR standard for both 2nd and 3rd trimesters is +350 kcal). This energy is vital for the rapid deposition of maternal fat stores and fetal tissue accretion. 2. **Why other options are incorrect:** * **150/200/250 kCals:** These values are insufficient to meet the metabolic demands of the late stages of pregnancy. In the **first trimester**, the extra calorie requirement is actually **0 (zero)**, as fetal growth is minimal and the focus is on micronutrient quality rather than caloric quantity. **High-Yield Clinical Pearls for NEET-PG:** * **Lactation Requirements:** The extra calorie requirement for lactation is much higher: **+600 kcal/day** (0–6 months) and **+520 kcal/day** (6–12 months). * **Protein Requirement:** During pregnancy, the additional protein intake is **+9.5 g/day** (2nd trimester) and **+22.0 g/day** (3rd trimester). * **Weight Gain:** An average weight gain of **10–12 kg** is considered healthy for a woman with a normal pre-pregnancy BMI. * **Iron & Folic Acid:** 60 mg elemental iron and 400 µg folic acid (IFA tablet) are recommended daily for 180 days starting from the second trimester.

Question 479: Pasteurization of milk does not kill which of the following microorganisms?

A. Bacillus anthracis (Correct Answer)
B. Brucella species
C. Mycobacterium tuberculosis
D. Streptococcus species

Explanation: **Explanation:** Pasteurization is a heat-treatment process designed to eliminate pathogenic non-spore-forming bacteria and significantly reduce the number of spoilage microorganisms in milk. **1. Why Bacillus anthracis is the correct answer:** The primary reason *Bacillus anthracis* survives pasteurization is its ability to form **endospores**. Pasteurization temperatures (e.g., 63°C for 30 minutes in the Holder method or 72°C for 15 seconds in HTST) are sufficient to kill vegetative cells but are ineffective against bacterial spores. Spores are highly resistant to heat, dehydration, and chemicals, requiring higher temperatures (like autoclaving at 121°C) for complete eradication. **2. Why the other options are incorrect:** * **Mycobacterium tuberculosis:** Historically, this was the most heat-resistant pathogen found in milk. Pasteurization standards were specifically designed to ensure the destruction of *M. tuberculosis* and *Coxiella burnetii* (the most heat-resistant non-spore former). * **Brucella species:** These are the causative agents of Brucellosis (undulant fever), often transmitted via raw milk. They are vegetative bacteria and are readily killed by standard pasteurization temperatures. * **Streptococcus species:** These are common milk-borne pathogens (causing sore throats or scarlet fever) that do not form spores and are easily neutralized by heat treatment. **High-Yield Clinical Pearls for NEET-PG:** * **Index organism for pasteurization efficiency:** *Coxiella burnetii* (due to its high thermal resistance). * **Phosphatase Test:** Used to check the efficacy of pasteurization. If the enzyme alkaline phosphatase is destroyed, it indicates the milk has been heated sufficiently to kill *M. tuberculosis*. * **Standard Methods:** * **Holder Method:** 63°C (145°F) for 30 mins. * **HTST (High-Temperature Short-Time):** 72°C (161°F) for 15 seconds. * **Note:** Pasteurization is **not** sterilization; it does not kill thermoduric bacteria or spores.

Question 480: Which of the following factors in Stephan's curve is related to caries incidence and sugar intake?

A. Physical form of sugar
B. Frequency of sugar intake
C. pH of plaque (Correct Answer)
D. Quantity of sugar intake

Explanation: ### Explanation **Stephan’s Curve** is a graphical representation of the changes in **dental plaque pH** that occur immediately after the consumption of fermentable carbohydrates (sugars). It is the fundamental concept used to explain the pathogenesis of dental caries. #### Why "pH of Plaque" is the Correct Answer The curve plots the **pH of plaque** against **time**. When sugar is consumed, bacteria in the plaque (like *Streptococcus mutans*) ferment the sugar into acids (primarily lactic acid). This causes the plaque pH to drop rapidly. If the pH falls below the **"Critical pH" (typically 5.5)**, the enamel begins to demineralize. The curve illustrates the drop in pH and its subsequent gradual recovery to baseline due to the buffering action of saliva. Therefore, the curve directly measures and relates the **pH of plaque** to caries risk. #### Why Other Options are Incorrect * **A & D (Physical form and Quantity):** While the physical form (sticky vs. liquid) and total quantity of sugar influence the *severity* and *duration* of the pH drop, they are not what the Stephan’s curve itself represents. * **B (Frequency of sugar intake):** Frequency is a major clinical risk factor (demonstrated by the Vipeholm study), but the Stephan’s curve specifically tracks the **biochemical response (pH change)** of a single intake event over time. #### High-Yield Clinical Pearls for NEET-PG * **Critical pH:** 5.5 (for enamel); 6.2–6.7 (for dentin/root surfaces). * **Resting Plaque pH:** Usually between 6.2 and 7.0. * **Time Factor:** It takes roughly 5–20 minutes to reach the lowest pH and 30–60 minutes for the pH to return to normal levels. * **Vipeholm Study:** Established that the **frequency** and **stickiness** of sugar are more cariogenic than the total amount consumed.

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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