Nutrition and Health Practice Questions

Q: Which essential amino acid is deficient in pulse proteins?

Methionine. **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.

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

30-40%. ### 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**.

Q: What is the richest dietary source of iodine?

Seafood. **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)**.

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

Vitamin. ### 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.

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

Serum immunoglobulin. 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.

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

18 mg/d. **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.

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

3.2%. ### 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**.

Q: What is the recommended daily folic acid supplementation during lactation?

150 mcg/d. ### Explanation The correct answer is **150 mcg/d**. **1. Why 150 mcg/d is correct:** According to the **ICMR-NIN (2020/2024) Dietary Guidelines**, the Recommended Dietary Allowance (RDA) for folic acid varies significantly across different physiological states. For a non-pregnant, non-lactating adult woman, the requirement is **200 mcg/d**. During **lactation**, the requirement increases by an additional **150 mcg/d** (Total: 350 mcg/d) to compensate for the folate secreted in breast milk and to maintain maternal stores. **2. Why the other options are incorrect:** * **100 mcg/d:** This is the daily dose of elemental iron (not folic acid) provided in the National Iron Plus Initiative (NIPI) for pregnant and lactating women. * **400 mcg/d:** This is the recommended *additional* intake during **pregnancy** (Total: 200 + 400 = 600 mcg/d) to prevent neural tube defects (NTDs) and support fetal growth. * **450 mcg/d:** This does not correspond to any standard ICMR recommendation for folic acid in the peripartum period. **3. High-Yield Clinical Pearls for NEET-PG:** * **Pre-conception:** To prevent NTDs, 400 mcg (0.4 mg) of folic acid should be started at least 1 month before conception and continued through the first trimester. * **High-risk cases:** Women with a previous history of a child with NTD require a higher dose of **4 mg/d**. * **IFA Program (India):** Under the *Anemia Mukt Bharat* strategy, pregnant and lactating women receive **60 mg Iron + 500 mcg Folic Acid** daily for 180 days. * **Folate vs. Folic Acid:** Folate is the natural form (food), while folic acid is the synthetic form used in supplements (higher bioavailability).

Q: An egg yields about how many kcal of energy?

70 kcal. **Explanation:** The energy content of a standard whole chicken egg (average weight 50–60g) is approximately **70 kcal**. This value is derived from its macronutrient composition: a typical egg contains roughly **6g of protein** and **5g of fat**, with negligible carbohydrates. Using the Atwater factors (4 kcal/g for protein and 9 kcal/g for fat), the calculation (6×4) + (5×9) yields approximately 69 kcal, which is rounded to 70 kcal in standard nutritional and medical textbooks. **Analysis of Options:** * **Option A (70 kcal):** This is the standard physiological value accepted by the WHO and nutritional guidelines for a medium-to-large egg. * **Options B, C, and D (80, 90, 100 kcal):** These values overestimate the caloric density of a standard egg. While an extra-large or jumbo egg might approach 80–90 kcal, for medical examinations, the "reference egg" is always calculated at 70 kcal. **High-Yield Facts for NEET-PG:** * **Biological Value (BV):** The egg has the highest Biological Value (100) among all natural foods and is considered the **"Reference Protein"** against which other proteins are compared. * **Net Protein Utilization (NPU):** For an egg, the NPU is approximately 96, indicating extremely high digestibility and absorption. * **Limiting Amino Acids:** Eggs contain all essential amino acids in balanced proportions; they are notably rich in **Leucine** and **Choline**. * **Fat Content:** Most of the 70 kcal (and all the cholesterol/fat-soluble vitamins) are concentrated in the **yolk**, while the white (albumin) contains primarily protein and water.

Q: Under the Prevention of Food Adulteration Act, the minimum expected level of iodine in iodized salt at the production level is:

30 ppm. ### Explanation **1. Why 30 ppm is the Correct Answer:** Under the **Prevention of Food Adulteration (PFA) Act** (now incorporated under FSSAI), the National Iodine Deficiency Disorders Control Programme (NIDDCP) mandates specific iodine levels to ensure adequate intake despite losses during transit and storage. The minimum iodine content is fixed at **30 ppm (parts per million) at the production level** (manufacturer level). This higher concentration accounts for the inevitable degradation of iodine due to environmental factors like heat and humidity before it reaches the consumer. **2. Analysis of Incorrect Options:** * **Option B (25 ppm) & C (20 ppm):** These are intermediate values that do not correspond to the statutory requirements set by the Indian government for salt iodization. * **Option D (15 ppm):** This is a common distractor. While 30 ppm is required at the production level, **15 ppm** is the minimum required iodine level at the **consumer level** (retail/household level). The 50% reduction from production to consumption is the calculated "margin of loss." **3. High-Yield Clinical Pearls for NEET-PG:** * **Daily Requirement:** The average adult requires about **150 μg** of iodine daily. * **Indicator of Iodine Status:** The most sensitive indicator for monitoring recent iodine intake in a community is **Urinary Iodine Excretion (UIE)**. A median UIE of **100–199 μg/L** indicates adequate iodine nutrition. * **Goiter Rate:** A community is said to have endemic goiter if the Total Goiter Rate (TGR) is **>5%** among primary school-age children (6–12 years). * **Monitoring:** At the household level, iodine levels in salt are typically tested using **Rapid Diagnostic Kits (MBI kits)**, which show a color change (blue/purple) in the presence of iodine.

Question 1

Which essential amino acid is deficient in pulse proteins?

Accepted Answer

Methionine

Answer

Lysine

Answer

Threonine

Answer

All of the above

Question 2

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

Accepted Answer

30-40%

Answer

15-20%

Answer

65-80%

Answer

7-10%

Question 3

What is the richest dietary source of iodine?

Accepted Answer

Seafood

Answer

Milk

Answer

Meat

Answer

Butter

Question 4

Which of the following is not one of the proximate principles of food?

Accepted Answer

Vitamin

Answer

Protein

Answer

Fat

Answer

Carbohydrate

Question 5

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

Accepted Answer

Serum immunoglobulin

Answer

Urinary nitrogen excretion

Answer

Mid arm circumference

Answer

Serum transferrin

Question 6

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

Accepted Answer

18 mg/d

Answer

34 mg/d

Answer

24 mg/d

Answer

40 mg/d

Question 7

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

Accepted Answer

3.2%

Answer

1.1%

Answer

3.5%

Answer

4.1%

Question 8

What is the recommended daily folic acid supplementation during lactation?

Accepted Answer

150 mcg/d

Answer

100 mcg/d

Answer

400 mcg/d

Answer

450 mcg/d

Question 9

An egg yields about how many kcal of energy?

Accepted Answer

70 kcal

Answer

80 kcal

Answer

90 kcal

Answer

100 kcal

Question 10

Under the Prevention of Food Adulteration Act, the minimum expected level of iodine in iodized salt at the production level is:

Accepted Answer

30 ppm

Answer

25 ppm

Answer

20 ppm

Answer

15 ppm

Nutrition and Health — MCQs

Nutrition and Health — MCQs

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