Nutrition and Health Practice Questions

Q: What is the optimum percentage of calories that should be provided by proteins?

10-15%. In balanced nutrition, the distribution of macronutrients is essential for maintaining physiological functions and preventing chronic diseases. For a healthy adult, the **Acceptable Macronutrient Distribution Range (AMDR)** for proteins is typically set between **10% and 15%** of the total daily caloric intake. ### Why 10-15% is Correct: This range ensures an adequate supply of essential amino acids for tissue repair, enzyme production, and immune function without placing an excessive metabolic load on the kidneys. In the Indian context (ICMR-NIN guidelines), the recommended dietary allowance (RDA) for protein is approximately **0.8 to 1.0 g/kg body weight/day**, which aligns with this percentage of total energy. ### Explanation of Incorrect Options: * **A (5-10%):** This is insufficient for most adults. Intakes below 10% may lead to protein-energy malnutrition (PEM), muscle wasting, and impaired immunity. * **C (15-20%):** While common in "high-protein" diets or for athletes, this is above the standard population recommendation for a balanced diet. * **D (20-30%):** This range is typically reserved for therapeutic diets (e.g., burn recovery) or specific bodybuilding regimens. Long-term intake at this level may increase the risk of renal calculi or accelerate underlying kidney disease. ### High-Yield Facts for NEET-PG: * **Energy Values (Atwater Factors):** Protein = 4 kcal/g; Carbohydrates = 4 kcal/g; Fat = 9 kcal/g. * **Balanced Diet Ratios:** * **Carbohydrates:** 50–70% (Major source) * **Proteins:** 10–15% * **Fats:** 20–30% * **Net Protein Utilization (NPU):** Egg protein is considered the "Reference Protein" with an NPU of 100. * **Limiting Amino Acids:** Pulses are deficient in Methionine; Cereals are deficient in Lysine. (Mixing them provides a "complete" protein profile).

Q: Pasteurization of milk is achieved by boiling at what temperature and duration?

65°C for 30 minutes. **Explanation:** Pasteurization is a protective heat-treatment process designed to kill pathogenic bacteria (especially *Mycobacterium tuberculosis* and *Coxiella burnetii*) and reduce spoilage organisms without significantly altering the nutritional value or flavor of milk. **Why Option A is Correct:** Option A refers to the **Holder Method (Low-Temperature Long-Time - LTLT)**. In this method, milk is heated to **63.5°C to 65.6°C (standardized as 65°C)** and maintained at that temperature for **30 minutes**, followed by rapid cooling to below 5°C. This duration ensures the destruction of the most heat-resistant non-spore-forming pathogens. **Analysis of Incorrect Options:** * **Option B:** This is a distractor for the **Flash Method (High-Temperature Short-Time - HTST)**. The correct parameters for HTST are **72°C for 15 seconds** (not 10 seconds). * **Option C:** Heating milk to 100°C is considered boiling or sterilization, which alters the protein structure and taste, exceeding the requirements for pasteurization. * **Option D:** This resembles **Ultra-High Temperature (UHT)** processing, which typically requires **125°C to 150°C for 1 to 3 seconds**. **High-Yield NEET-PG Pearls:** 1. **Phosphatase Test:** This is the standard test to check the efficiency of pasteurization. Since the enzyme alkaline phosphatase is naturally present in raw milk and is destroyed at temperatures slightly higher than those required to kill pathogens, its absence indicates successful pasteurization. 2. **Standard for Pasteurization:** *Coxiella burnetii* (the causative agent of Q fever) is the most heat-resistant pathogen found in milk; therefore, pasteurization parameters are specifically set to ensure its destruction. 3. **Storage:** After pasteurization, milk must be quickly cooled to **5°C or less** to prevent the growth of any surviving thermoduric bacteria.

Q: Why is egg considered an ideal protein source?

High biological value and Net Protein Utilization (NPU). **Explanation:** The egg is considered the "Gold Standard" or the reference protein in human nutrition because its amino acid profile most closely matches the requirements of the human body. **1. Why Option C is Correct:** The quality of a protein is determined by its **Biological Value (BV)** and **Net Protein Utilization (NPU)**. * **Biological Value:** This measures the proportion of absorbed nitrogen that is retained by the body. The BV of an egg is **94**, the highest among naturally occurring foods. * **Net Protein Utilization (NPU):** This measures the proportion of nitrogen intake that is actually retained (taking digestibility into account). The NPU of an egg is **96**. Because these values are near-perfect, the egg is used as a benchmark (Score = 100) to compare the quality of all other dietary proteins. **2. Why Other Options are Incorrect:** * **Option A:** High cholesterol is a lipid characteristic and does not define the quality of a protein. * **Option B:** While eggs have good protein content (approx. 13g/100g), foods like soy (40g/100g) or pulses have higher absolute quantities. "Ideal" refers to **quality**, not just quantity. * **Option D:** While eggs contain all essential amino acids, the term "ideal" specifically relates to the efficiency of utilization (BV/NPU) rather than just the absence of a limiting amino acid. **High-Yield Clinical Pearls for NEET-PG:** * **Reference Protein:** Egg protein is the reference protein against which others are compared. * **Limiting Amino Acids:** Pulses are deficient in **Methionine**, while Cereals are deficient in **Lysine**. Egg has no such deficiency. * **Protein Efficiency Ratio (PER):** For eggs, it is approximately 4.5. * **Daily Requirement:** The safe intake of protein for an average Indian adult is **0.83 g/kg body weight/day** (as per ICMR-NIN 2020 guidelines).

Q: Which of the following trace elements cannot be completely supplemented by diet in pregnancy?

Iron (Fe). **Explanation:** **Why Iron (Fe) is the Correct Answer:** During pregnancy, the physiological requirement for iron increases significantly to support the expansion of maternal red cell mass, the development of the placenta, and the growth of the fetus. The total iron requirement during a singleton pregnancy is approximately **1000 mg**. Even with a balanced, iron-rich diet, the bioavailability of dietary iron (especially non-heme iron from plant sources common in the Indian diet) is insufficient to meet these escalated demands. The daily absorption required exceeds what the gut can physiologically process from food alone. Therefore, the **National Iron Plus Initiative (NIPI)** and WHO mandate oral supplementation (100 mg elemental iron daily for 180 days) to prevent Iron Deficiency Anemia (IDA). **Analysis of Incorrect Options:** * **B. Calcium (Ca++):** While calcium requirements increase (to ~1200 mg/day), they can generally be met through a diet rich in dairy products, ragi, and green leafy vegetables. Supplementation is often given to prevent pre-eclampsia, but it is theoretically possible to meet needs via diet. * **C. Zinc (Zn):** Zinc is widely available in pulses, nuts, and animal products. Deficiency is rare in pregnant women consuming a diverse diet. * **D. Manganese:** This is a micro-trace element required in very minute quantities; dietary intake is almost always sufficient. **High-Yield Clinical Pearls for NEET-PG:** * **Iron Stores:** A woman must have at least 500 mg of iron stores to navigate pregnancy without supplements; most women in developing countries start pregnancy with near-zero stores. * **IFA Tablet Composition (Programmatic):** 100 mg Elemental Iron + 500 mcg Folic Acid. * **Prophylaxis:** Started from the 2nd trimester (after 12 weeks) to avoid aggravating first-trimester nausea. * **Most Common Nutrient Deficiency:** Iron deficiency remains the most common nutritional deficiency during pregnancy worldwide.

Q: What does the Kanawati index measure?

Mid-arm circumference divided by head circumference. The **Kanawati Index** (also known as the Kanawati and McLaren Index) is a rapid screening tool used to assess the nutritional status of children, particularly those between **1 and 5 years of age**. ### 1. Why Option B is Correct The index is calculated as: **Kanawati Index = Mid-Upper Arm Circumference (MUAC) / Head Circumference** * **Medical Concept:** In early childhood (1–5 years), the head circumference remains relatively constant, while the MUAC is highly sensitive to muscle wasting and fat loss. A ratio of **>0.31** is considered normal. Values below this indicate Protein-Energy Malnutrition (PEM): * **0.31 – 0.28:** Mild PEM * **0.28 – 0.25:** Moderate PEM * **< 0.25:** Severe PEM ### 2. Why Other Options are Incorrect * **Option A (Height/Head Circumference):** This is not a standard anthropometric index for malnutrition. * **Option C (Weight/Height):** This is the basis for **Quetelet’s Index (BMI)** or **Wasting**. While it measures acute malnutrition, it is not the Kanawati Index. * **Option D (Abdominal/Head Circumference):** This ratio is sometimes used in fetal ultrasound to detect intrauterine growth restriction (IUGR), but it is not used for postnatal nutritional screening in the community. ### 3. High-Yield Clinical Pearls for NEET-PG * **Age Group:** Most effective for children aged **12–60 months**. * **Advantage:** It is "age-independent" because both parameters change slowly in the 1–5 year age group, making it useful when the child's exact age is unknown. * **Shakir’s Tape:** Often used to measure MUAC. A MUAC **<12.5 cm** indicates malnutrition. * **Quac Stick:** Another tool that relates MUAC to height (MUAC-for-height).

Q: Under the Food Safety and Standards Act, non-vegetarian foods containing only eggs are labeled with what color mark?

Brown. **Explanation:** Under the **Food Safety and Standards (Packaging and Labelling) Regulations**, it is mandatory for every package of food to bear a specific symbol to indicate whether the contents are vegetarian or non-vegetarian. **1. Why Brown is Correct:** According to the FSSAI (Food Safety and Standards Authority of India) guidelines, **non-vegetarian food** is defined as any food which contains whole or part of any animal including birds, fresh water or marine animals, or **eggs**. Previously, the symbol for non-vegetarian food was a brown circle inside a brown square. However, to improve visibility for color-blind individuals, the current regulation specifies a **brown color filled triangle** inside a square with a brown outline. Since eggs are animal products, foods containing only eggs are classified as non-vegetarian and must bear the **Brown** mark. **2. Why other options are incorrect:** * **Green:** This symbol (a green color filled circle inside a square) is reserved exclusively for **Vegetarian** food, which contains no animal-derived ingredients (except milk and milk products). * **Yellow/Orange:** These colors are not used for the primary classification of veg/non-veg food. However, in different contexts of food safety, orange may be associated with specific risk warnings or fortification (e.g., the "+F" logo for fortified foods is often blue/dark blue). **High-Yield Clinical Pearls for NEET-PG:** * **Milk Exception:** Even though milk is an animal product, it is classified as **Vegetarian** under FSSAI rules. * **The Symbol Change:** Remember the shift from "Circle" to **"Triangle"** for non-veg food (Brown) to distinguish it from the "Circle" for veg food (Green). * **Fortification Logo:** Look for the **Square with a +F** symbol, which indicates food fortified with micronutrients (Vit A, D, Iron, Folic Acid, B12) to combat "hidden hunger."

Q: Hypothyroidism in sub-Himalayan regions is primarily due to deficiency of which essential micronutrient?

Iodine. **Explanation:** The sub-Himalayan region is a classic example of a **"Goitre Belt."** The primary cause of hypothyroidism in these areas is **Iodine deficiency**. This occurs because the soil in mountainous regions is frequently leached of iodine due to heavy rainfall and melting snow. Consequently, crops grown in this soil are iodine-deficient, leading to inadequate dietary intake among the local population. Iodine is the essential substrate for the synthesis of thyroid hormones (T3 and T4); its deficiency leads to compensatory pituitary secretion of TSH, resulting in thyroid hyperplasia (Goitre) and hypothyroidism. **Analysis of Incorrect Options:** * **B. Iron:** While iron deficiency is the most common nutritional deficiency in India (causing anemia), it does not directly cause hypothyroidism. However, iron is a cofactor for *thyroid peroxidase*, so deficiency can sometimes worsen existing iodine deficiency disorders. * **C. Copper:** Copper is a trace element involved in energy production and iron metabolism. It is not a primary driver of thyroid dysfunction in specific geographic belts. * **D. Selenium:** Selenium is a constituent of *iodothyronine deiodinases* (which convert T4 to T3). While selenium deficiency can exacerbate thyroid issues, it is considered a secondary factor compared to the environmental lack of iodine in the Himalayas. **High-Yield Clinical Pearls for NEET-PG:** * **Iodine Deficiency Disorders (IDD):** Includes goitre, cretinism, subnormal intelligence, and stillbirths. * **Indicator of IDD:** The most sensitive indicator for newborn screening is **TSH levels**, while the best indicator for community assessment is **Urinary Iodine Excretion (UIE)**. * **Public Health Goal:** The National Iodine Deficiency Disorders Control Programme (NIDDCP) aims to ensure a consumption of iodized salt with at least **15 ppm** of iodine at the household level.

Q: Consumption of which of the following is not associated with the development of diffuse nontoxic goiter?

Eggplant. The development of a **diffuse nontoxic goiter** (simple goiter) is often linked to the ingestion of **goitrogens**—substances that interfere with thyroid hormone synthesis, leading to a compensatory rise in TSH and subsequent thyroid enlargement [1]. **Why Eggplant is the Correct Answer:** **Eggplant (Option D)** does not contain significant amounts of goitrogenic compounds. It is a member of the Solanaceae family and is not associated with thyroid inhibition or goiter formation. **Why the Other Options are Incorrect:** * **Cauliflower (Option A) and Brussel sprouts (Option C):** These belong to the **Cruciferous (Brassicaceae)** family. They contain **glucosinolates**, which are metabolized into **thiocyanates**. Thiocyanates competitively inhibit the sodium-iodide symporter (NIS), preventing iodine uptake by the thyroid gland [1]. * **Cassava root (Option B):** This is a major source of goitrogens in certain geographical regions. It contains **linamarin**, a cyanogenic glycoside that, when ingested, is converted into thiocyanate. In areas with borderline iodine deficiency, heavy cassava consumption is a leading cause of endemic goiter. **Clinical Pearls for NEET-PG:** * **Mechanism:** Goitrogens primarily act by inhibiting the **iodide trap** (thiocyanates) or inhibiting **thyroid peroxidase (TPO)** (propylthiouracil-like compounds). * **Iodine Interaction:** The goitrogenic effect of cruciferous vegetables and cassava is significantly amplified in the presence of **concomitant iodine deficiency**. * **Other Goitrogens:** Lithium, Amiodarone, and certain flavonoids (found in millet) are also high-yield goitrogenic substances to remember for the exam [1].

Question 1

What is the optimum percentage of calories that should be provided by proteins?

Accepted Answer

10-15%

Answer

5-10%

Answer

15-20%

Answer

20-30%

Question 2

Pasteurization of milk is achieved by boiling at what temperature and duration?

Accepted Answer

65°C for 30 minutes

Answer

72°C for 10 seconds

Answer

100°C for 20 seconds

Answer

136°C for 30 seconds

Question 3

Why is egg considered an ideal protein source?

Accepted Answer

High biological value and Net Protein Utilization (NPU)

Answer

High cholesterol content

Answer

High protein content per 100 grams

Answer

Absence of a limiting amino acid

Question 4

Which of the following trace elements cannot be completely supplemented by diet in pregnancy?

Accepted Answer

Iron (Fe)

Answer

Calcium (Ca++)

Answer

Zinc (Zn)

Answer

Manganese

Question 5

What does the Kanawati index measure?

Accepted Answer

Mid-arm circumference divided by head circumference

Answer

Height divided by head circumference

Answer

Weight divided by height

Answer

Abdominal circumference divided by head circumference

Question 6

Under the Food Safety and Standards Act, non-vegetarian foods containing only eggs are labeled with what color mark?

Accepted Answer

Brown

Answer

Green

Answer

Yellow

Answer

Orange

Question 7

Hypothyroidism in sub-Himalayan regions is primarily due to deficiency of which essential micronutrient?

Accepted Answer

Iodine

Answer

Iron

Answer

Copper

Answer

Selenium

Question 8

Which of the following components are included in the National Iron Plus Initiative?

Accepted Answer

Biweekly supplementation of iron and folic acid to children aged 6-60 months

Answer

Biweekly supplementation of iron and folic acid to pregnant and lactating women

Answer

Biweekly supplementation of iron and folic acid to adolescent girls

Answer

All of the above are part of the initiative

Question 9

Consumption of which of the following is not associated with the development of diffuse nontoxic goiter?

Accepted Answer

Eggplant

Answer

Cauliflower

Answer

Cassava root

Answer

Brussel sprouts

Question 10

All of the following are milk-borne diseases except?

Accepted Answer

Pasteurellosis

Answer

Brucellosis

Answer

Streptococcal infections

Answer

Viral hepatitis

Nutrition and Health — MCQs

Nutrition and Health — MCQs

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