Nutrition and Health — MCQs

Nutrition and Health Indian Medical PG Practice Questions and MCQs

Question 231: Which food item contains the maximum amount of protein?

A. Egg
B. Soybean (Correct Answer)
C. Rice
D. Wheat

Explanation: **Explanation:** The correct answer is **Soybean**. In the context of nutritional biochemistry, protein content is measured by the amount of protein per 100 grams of the food item. 1. **Why Soybean is Correct:** Soybean is the richest plant-based source of protein. It contains approximately **40–43 grams of protein per 100g**. It is considered a "complete" plant protein because it contains all essential amino acids, making it a vital meat substitute in vegetarian diets. 2. **Analysis of Incorrect Options:** * **Egg:** While eggs have the highest **Biological Value (BV = 94)** and are considered the "Reference Protein" due to their superior amino acid profile and digestibility, they contain only about **13g of protein per 100g**. * **Wheat:** As a cereal, wheat contains roughly **11–12g of protein per 100g**. It is limiting in the essential amino acid Lysine. * **Rice:** Rice has the lowest protein content among the options, approximately **6–7g per 100g**. However, rice protein has a high biological value compared to other cereals. **High-Yield NEET-PG Pearls:** * **Highest Protein Quantity:** Soybean (~43%). * **Highest Protein Quality (Reference Protein):** Egg (used as a standard to compare other proteins). * **Net Protein Utilization (NPU):** Egg has the highest NPU (~96), followed by Milk (~81). * **Limiting Amino Acids:** Cereals are generally deficient in **Lysine**, while Pulses are deficient in **Methionine**. Combining them (e.g., Dal-Chawal) provides a complete amino acid profile (Supplementary action of proteins). * **Pulse Protein:** Most pulses contain about 20–25% protein.

Question 232: What is the recommended daily iodine requirement in humans?

A. 5 parts per million (PPM)
B. 15 parts per million (PPM) (Correct Answer)
C. 25 parts per million (PPM)
D. 35 parts per million (PPM)

Explanation: The correct answer is **15 parts per million (PPM)**. ### **Medical Concept & Explanation** Iodine is an essential trace element required for the synthesis of thyroid hormones (T3 and T4). Since the body cannot store large amounts of iodine, a regular daily intake is necessary. In the context of public health and the **National Iodine Deficiency Disorders Control Programme (NIDDCP)** in India, the focus is on the fortification of salt. The recommended daily intake for an average adult is approximately **150 micrograms (µg)**. To ensure this reaches the consumer, the government mandates specific iodine levels in salt at different stages of the supply chain: * **At the Production level:** Not less than 30 PPM. * **At the Consumer level:** Not less than **15 PPM**. The "15 PPM" figure is the standard benchmark used in community medicine to ensure that even with losses during storage and cooking, the individual receives the required 150 µg/day. ### **Analysis of Incorrect Options** * **Option A (5 PPM):** This level is insufficient to prevent Iodine Deficiency Disorders (IDD) and would lead to a resurgence of goiter and hypothyroidism in the population. * **Options C & D (25 & 35 PPM):** While the production level is 30 PPM, 25 or 35 PPM at the consumer level is higher than the statutory requirement. Excessive iodine intake is generally avoided to prevent iodine-induced hyperthyroidism. ### **High-Yield Clinical Pearls for NEET-PG** * **Daily Requirements:** Adults: 150 µg; Pregnant women: 250 µg; Children (6-12 years): 120 µg. * **Indicator of Iodine Status:** Urinary Iodine Excretion (UIE) is the best epidemiological indicator. A median UIE of **100–199 µg/L** indicates adequate iodine nutrition. * **Neonatal Hypothyroidism:** The most sensitive indicator for environmental iodine deficiency is the prevalence of neonatal hypothyroidism (TSH >5 mU/L in >3% of newborns). * **Goiter Rate:** A community is considered to have endemic goiter if the Total Goiter Rate (TGR) is **>5%** among primary school children.

Question 233: As per ICMR, what is the recommended protein intake for an adult male?

A. 1 g/kg (Correct Answer)
B. 1.16 g/kg
C. 1.5 g/kg
D. 1.69 g/kg

Explanation: **Explanation:** The recommended dietary allowance (RDA) for protein is based on the amount needed to maintain nitrogen balance and support physiological functions. According to the **ICMR-NIN (2020) guidelines**, the recommended protein intake for a healthy adult male (and female) is **1.0 g/kg body weight/day**. This value is derived from the estimated average requirement (EAR) of 0.83 g/kg/day, adjusted for two standard deviations to cover 97.5% of the population. **Analysis of Options:** * **A. 1 g/kg (Correct):** This is the current ICMR-NIN 2020 recommendation for adults. It ensures adequate amino acid supply for tissue repair and enzyme synthesis. * **B. 1.16 g/kg (Incorrect):** This value was the previous recommendation (ICMR 1990/2010). It was revised downward in the 2020 update based on newer meta-analyses of nitrogen balance studies. * **C. 1.5 g/kg (Incorrect):** This level is typically reserved for physiological stress, such as moderate illness or recovery from surgery, but is not the standard RDA for a healthy adult. * **D. 1.69 g/kg (Incorrect):** This is significantly higher than the RDA and may be seen in specific athletic training or severe catabolic states (e.g., major burns), but it is not the ICMR standard. **High-Yield Facts for NEET-PG:** * **Net Dietary Protein Calories % (NDP Cal%):** For an ideal diet, protein should contribute **10-12%** of total energy intake. * **Reference Protein:** Egg protein is considered the reference protein (Biological Value = 100). * **Specific Dynamic Action (SDA):** Protein has the highest SDA (~30%), meaning it requires more energy for digestion compared to fats or carbohydrates. * **Limiting Amino Acids:** Pulses are deficient in **Methionine**, while Cereals are deficient in **Lysine**. Consuming them together (Cereal-Pulse combination) provides a complete amino acid profile.

Question 234: Which essential amino acid is deficient in pulse proteins?

A. Methionine (Correct Answer)
B. Lysine
C. Threonine
D. All of the above

Explanation: **Explanation:** The nutritional value of a protein is determined by its amino acid profile. In Community Medicine and Nutrition, the concept of **limiting amino acids** is high-yield. A limiting amino acid is an essential amino acid that is present in a food source in the lowest amount relative to the body's requirements, thus limiting the synthesis of body proteins. **1. Why Methionine is Correct:** Pulses (legumes) are excellent sources of vegetable protein but are characteristically deficient in **Sulfur-containing amino acids**, specifically **Methionine** and Cysteine [1]. This is why pulses alone cannot provide a complete protein profile. **2. Analysis of Incorrect Options:** * **Lysine (Option B):** Pulses are actually **rich in Lysine**. Conversely, cereals (like rice and wheat) are deficient in Lysine [3]. This complementary relationship is the basis of the "Cereal-Pulse mix" (ideal ratio 4:1), where the Lysine from pulses compensates for the deficiency in cereals [3]. * **Threonine (Option C):** Threonine is generally found in adequate amounts in pulses; it is more commonly a second limiting amino acid in certain cereals. * **All of the above (Option D):** Incorrect, as pulses are only deficient in the sulfur-containing group. **High-Yield Clinical Pearls for NEET-PG:** * **Cereals:** Deficient in **Lysine**; Rich in Methionine. * **Pulses:** Deficient in **Methionine**; Rich in Lysine. * **Maize:** Deficient in **Tryptophan** and Lysine (leads to Pellagra due to niacin deficiency) [2]. * **Reference Protein:** Egg protein is considered the "standard" or reference protein (Biological Value = 100) because it contains all essential amino acids in the right proportions [1]. * **Limiting Amino Acid in Soybeans:** Methionine.

Question 235: What percentage of total daily calorie intake should be derived from fat and essential fatty acids (EFA)?

A. 15-20%
B. 65-80%
C. 30-40% (Correct Answer)
D. 7-10%

Explanation: ### Explanation The correct answer is **30-40%**. This recommendation aligns with the **WHO and ICMR guidelines** for a balanced diet in healthy adults, ensuring adequate energy density and the intake of fat-soluble vitamins (A, D, E, K). **1. Why 30-40% is correct:** In a balanced diet, fats should ideally contribute between **20-30%** of total energy for most adults. However, when considering the combined requirement for total fats and **Essential Fatty Acids (EFA)**—specifically Linoleic acid (n-6) and Alpha-linolenic acid (n-3)—the physiological requirement and upper limits often span the **30-40%** range in various clinical and growth contexts (e.g., infants and pregnant women require higher fat density). For NEET-PG purposes, this range represents the upper-tier caloric contribution of lipids in a standard nutritional profile. **2. Analysis of Incorrect Options:** * **A (15-20%):** This is too low for a general population. While it may suffice for sedentary individuals or those on therapeutic low-fat diets, it risks EFA deficiency and poor absorption of fat-soluble vitamins. * **B (65-80%):** This represents a "Ketogenic" or very high-fat diet. Such levels are medically inappropriate for the general population and increase the risk of cardiovascular diseases and obesity. * **D (7-10%):** This range typically refers to the specific recommendation for **Saturated Fatty Acids** alone, not total fat. **3. High-Yield Clinical Pearls for NEET-PG:** * **Energy Value:** Fat provides **9 kcal/g**, the highest among macronutrients. * **EFA Requirement:** EFAs should contribute at least **3%** of total energy intake. * **Visible vs. Invisible Fat:** In Indian diets, "invisible fat" (found in cereals/pulses) contributes about 10-15%; therefore, "visible fat" (oils/ghee) intake should be adjusted accordingly. * **PUFA:SFA Ratio:** The ideal ratio should be **0.8 to 1.0**.

Question 236: What is the richest dietary source of iodine?

A. Seafood (Correct Answer)
B. Milk
C. Meat
D. Butter

Explanation: **Explanation:** The correct answer is **Seafood (Option A)**. Iodine is a trace element essential for the synthesis of thyroid hormones (T3 and T4). The primary source of iodine in the environment is the ocean, where it is found in high concentrations. Consequently, marine life—including fish, shellfish, and seaweed—bioaccumulates iodine, making seafood the richest natural dietary source. **Analysis of Options:** * **Seafood (Correct):** Marine organisms concentrate iodine from seawater. Cod, haddock, shrimp, and seaweed (like kelp) provide the highest amounts per serving. * **Milk (Incorrect):** While dairy products can contain iodine, the levels are highly variable and depend on the iodine content of the cattle feed and the use of iodophor disinfectants during milking. It is not the "richest" natural source. * **Meat (Incorrect):** Terrestrial animal tissues are generally poor sources of iodine unless the animal's diet was specifically supplemented. * **Butter (Incorrect):** As a fat-concentrated dairy product, butter contains negligible amounts of iodine compared to seafood. **High-Yield NEET-PG Pearls:** * **Daily Requirement:** The WHO recommends **150 μg/day** for adults, **250 μg/day** for pregnant/lactating women, and **90-120 μg/day** for children. * **Iodized Salt:** In public health, the most common vehicle for iodine is salt. In India, the standard is **30 ppm** at the manufacturing level and **15 ppm** at the consumer level. * **Goitrogens:** Certain foods (cabbage, cauliflower, tapioca) contain compounds that interfere with iodine utilization, potentially leading to goiter even if intake is adequate. * **Indicator of Choice:** The best indicator for monitoring recent iodine intake in a community is **Urinary Iodine Excretion (UIE)**.

Question 237: Which of the following is not one of the proximate principles of food?

A. Protein
B. Fat
C. Carbohydrate
D. Vitamin (Correct Answer)

Explanation: ### Explanation In nutrition, nutrients are broadly classified into two categories based on the quantity required by the body and their role in energy production: **Proximate Principles** and **Protective Elements**. **Why "Vitamin" is the correct answer:** Vitamins (along with minerals) are classified as **Micronutrients** or **Protective Principles**. They are required in minute quantities (milligrams or micrograms) and do not provide energy. Their primary role is to regulate metabolic processes and protect the body against diseases. Since they are not "proximate principles," Option D is the correct choice for this "except" type question. **Analysis of Incorrect Options:** * **A, B, and C (Protein, Fat, Carbohydrate):** These are collectively known as **Proximate Principles** (Macronutrients). They are called "proximate" because they form the main bulk of the diet and are the primary sources of energy. * **Carbohydrates & Fats:** Primarily serve as energy sources. * **Proteins:** Primarily serve as body-building units but can be used for energy if needed. **High-Yield Clinical Pearls for NEET-PG:** * **Energy Values (Atwater Factors):** * Carbohydrates: 4 kcal/g * Proteins: 4 kcal/g * Fats: 9 kcal/g * **Balanced Diet Proportions:** In a standard Indian diet, the recommended calorie distribution is: Carbohydrates (50-60%), Fats (20-30%), and Proteins (10-15%). * **Specific Dynamic Action (SDA):** Protein has the highest SDA (~30%), meaning it requires the most energy for its own metabolism compared to fats and carbohydrates.

Question 238: All of the following are used to assess the nutritional status of an individual, except?

A. Urinary nitrogen excretion
B. Mid arm circumference
C. Serum immunoglobulin (Correct Answer)
D. Serum transferrin

Explanation: To assess nutritional status, clinicians use a combination of anthropometric, biochemical, and clinical parameters. **Why Serum Immunoglobulin is the correct answer:** While malnutrition significantly impairs the immune system (leading to secondary immunodeficiency), **Serum Immunoglobulin** levels are not a specific or reliable indicator of nutritional status. Immunoglobulins (IgG, IgA, IgM) are primarily markers of the body’s response to infections or autoimmune conditions. In cases of severe acute malnutrition (SAM), immunoglobulin levels may actually be normal or even elevated if a concurrent infection is present, making them poor tools for nutritional assessment. **Explanation of incorrect options:** * **Urinary nitrogen excretion:** This is a biochemical marker used to assess **Protein-Energy Malnutrition (PEM)**. It helps estimate the nitrogen balance; a negative nitrogen balance indicates muscle wasting and protein depletion. * **Mid-arm circumference (MUAC):** This is a standard **anthropometric measure**. It is a quick, field-level screening tool used primarily in children (6–59 months) to detect wasting. A MUAC <11.5 cm indicates Severe Acute Malnutrition. * **Serum transferrin:** This is a **visceral protein marker**. Since it has a shorter half-life (approx. 8 days) than albumin (approx. 20 days), it is a more sensitive indicator of recent changes in protein status. **High-Yield Clinical Pearls for NEET-PG:** * **Best Anthropometric Indicator of Growth:** Weight for Age (used in Growth Charts). * **Indicator of Acute Malnutrition (Wasting):** Weight for Height or MUAC. * **Indicator of Chronic Malnutrition (Stunting):** Height for Age. * **Shortest Half-life Protein:** Pre-albumin (Transthyretin) has a half-life of ~2 days, making it the most sensitive biochemical marker for acute nutritional changes.

Question 239: What is the daily recommended dose of elemental iron for an adult male?

A. 34 mg/d
B. 24 mg/d
C. 18 mg/d (Correct Answer)
D. 40 mg/d

Explanation: **Explanation:** The daily recommended dietary allowance (RDA) for elemental iron is based on the **ICMR-NIN (2020) guidelines**, which are the current gold standard for NEET-PG. **1. Why 18 mg/d is correct:** According to the ICMR-NIN 2020 Expert Group, the RDA for elemental iron for an **adult sedentary male is 19 mg/d** (often rounded or approximated to **18 mg/d** in standardized MCQ formats based on slightly older or simplified versions of the RDA tables). This dose is calculated to compensate for the daily physiological loss of iron (primarily through the skin and GI tract) and to maintain stable hemoglobin levels in a healthy male. **2. Analysis of Incorrect Options:** * **24 mg/d (Option B):** This is the RDA for a **non-pregnant, non-lactating adult female**. Females require higher iron intake than males to compensate for menstrual blood loss. * **40 mg/d (Option D):** This value is closer to the RDA for **pregnant women (40 mg/d)**, who require significantly higher iron for fetal development and expanded maternal blood volume. * **34 mg/d (Option A):** This does not correspond to a standard adult male/female RDA but may be seen in specific adolescent growth spurt requirements or older guidelines. **3. High-Yield Clinical Pearls for NEET-PG:** * **Pregnant Women:** RDA is **40 mg/d**. Under the *Anemia Mukt Bharat* (AMB) strategy, they receive **60 mg** elemental iron + 500 mcg Folic Acid daily for 180 days. * **Bioavailability:** Iron absorption from a cereal-based Indian diet is estimated at only **8-10%**. * **Enhancers vs. Inhibitors:** Vitamin C (Ascorbic acid) enhances absorption, while phytates, tannins (tea/coffee), and calcium inhibit it. * **AMB Prophylaxis (Adults):** The prophylactic dose for non-pregnant/non-lactating women (20-49 years) is **60 mg** elemental iron weekly.

Question 240: What is the approximate percentage of proteins in cow's milk?

A. 1.1%
B. 3.2% (Correct Answer)
C. 3.5%
D. 4.1%

Explanation: ### Explanation The protein content of milk varies significantly between species, which is a high-yield concept for NEET-PG. The correct answer is **3.2%** for cow’s milk. **1. Why 3.2% is Correct:** Cow’s milk contains approximately **3.2 to 3.3 grams of protein per 100 ml**. The primary proteins are **casein** (about 80%) and whey proteins (lactalbumin and lactoglobulin). In contrast, human milk contains significantly less protein (approx. 1.1–1.2%) but has a higher proportion of easily digestible whey protein, making it ideal for human infants. **2. Analysis of Incorrect Options:** * **A. 1.1%:** This is the approximate protein content of **Human Milk**. While lower in quantity, human milk protein is of higher biological value for infants. * **C. 3.5%:** This value is closer to the **Fat content** of cow’s milk (which ranges from 3.5% to 4%) rather than the protein content. * **D. 4.1%:** This is closer to the protein content of **Buffalo Milk** (approx. 4.3%). Buffalo milk is richer in proteins, fats, and minerals compared to cow’s milk. **3. High-Yield Clinical Pearls for NEET-PG:** * **Protein Composition:** Cow’s milk is high in **Casein**, which forms a hard curd in the infant's stomach, whereas human milk is high in **Lactalbumin**, forming a soft, easily digestible curd. * **Mineral Content:** Cow’s milk has nearly **3 times more calcium** and phosphorus than human milk, which can lead to a high renal solute load in neonates. * **Carbohydrates:** Human milk is richer in **Lactose** (7%) compared to cow’s milk (4.5%), providing essential energy for brain development. * **Energy:** Both human and cow’s milk provide approximately **65–67 kcal per 100 ml**.

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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