Nutrition and Health Practice Questions

Q: What is the net protein utilization of fish?

77%. **Explanation:** **Net Protein Utilization (NPU)** is a key indicator of protein quality, representing the proportion of nitrogen intake that is actually retained by the body for maintenance and growth. It is calculated as: *NPU = Biological Value × Digestibility Coefficient / 100.* 1. **Why 77% is correct:** Fish is considered a high-quality protein source. According to standard nutritional tables (Park’s Textbook of Preventive and Social Medicine), the **NPU of fish is 77%**. This indicates that fish protein is highly digestible and contains an optimal balance of essential amino acids, making it superior to most plant proteins but slightly lower than eggs or milk. 2. **Analysis of Incorrect Options:** * **57% (Option A):** This value is too low for animal proteins. It is closer to the NPU of certain pulses or cereals (e.g., Bengal gram is ~60%). * **67% (Option B):** This is the approximate NPU of **Meat (Chicken/Mutton)**. While meat is a high-quality protein, its NPU is statistically lower than that of fish. * **87% (Option C):** This is the NPU of **Cow’s Milk**. Milk proteins (casein and whey) have a higher retention rate than fish. 3. **High-Yield Clinical Pearls for NEET-PG:** * **Reference Protein:** The **Egg** is the "Gold Standard" with an NPU of **96%** (Biological Value of 100). * **Hierarchy of NPU:** Egg (96) > Milk (87) > **Fish (77)** > Meat (67) > Soy (55-60) > Pulses (45-55). * **Limiting Amino Acids:** Pulses are deficient in Methionine; Cereals are deficient in Lysine. Fish is rich in both, making it an excellent dietary supplement. * **Fish Oil:** Beyond protein, fish is a vital source of Omega-3 fatty acids (EPA and DHA), which are cardioprotective.

Q: What is the best site for measuring skin fold thickness?

Mid triceps. **Explanation:** Skinfold thickness is a widely used anthropometric method to estimate total body fat, as approximately 50% of body fat is located in the subcutaneous layer. **Why Mid-Triceps is the Correct Answer:** The **Mid-triceps** (measured at the midpoint between the acromion process of the scapula and the olecranon process of the ulna) is considered the **best and most practical site** for routine nutritional assessment. It is preferred because: 1. It is easily accessible. 2. It is highly representative of the total subcutaneous fat stores in the body. 3. Standardized reference tables (like the Jelliffe’s standards) are primarily based on triceps measurements. 4. It is less affected by localized edema compared to lower limb sites. **Analysis of Incorrect Options:** * **Subscapular region:** While frequently used in research and to calculate the "sum of skinfolds," it is more difficult to access (requires the patient to turn) and is less sensitive to rapid changes in nutritional status compared to the triceps. * **Abdominal region:** This site is used to assess visceral adiposity and metabolic risk (central obesity), but it is not the standard "best site" for general nutritional screening in community medicine. * **Mid-thighs:** This site is rarely used due to high variability in fat distribution and the influence of muscle mass, making it an unreliable indicator of overall nutritional status. **High-Yield Clinical Pearls for NEET-PG:** * **Instrument:** Skinfold thickness is measured using **Harpenden Calipers** (standard) or **Holtain Calipers**. * **Pressure:** The calipers must exert a constant pressure of **10 g/mm²**. * **Interpretation:** A measurement **<10 mm** in males and **<13 mm** in females is suggestive of malnutrition (undernutrition). * **Mid-Upper Arm Circumference (MUAC):** Often used alongside triceps skinfold to calculate the Mid-Arm Muscle Circumference (MAMC), which reflects protein/muscle reserves.

Q: A 70 kg man with a height of 1.75 m will have a BMI in which range?

Normal. **Explanation:** The Body Mass Index (BMI), or Quetelet index, is a key anthropometric measure used to classify nutritional status in adults. It is calculated using the formula: **BMI = Weight (kg) / [Height (m)]²**. **Step-by-Step Calculation:** 1. **Height²:** $1.75 \times 1.75 = 3.0625$ 2. **BMI:** $70 / 3.0625 \approx \mathbf{22.86\ kg/m^2}$ According to the WHO classification, a BMI between **18.5 and 24.9 kg/m²** is considered **Normal**. Since 22.86 falls within this range, Option D is correct. **Analysis of Incorrect Options:** * **A. Underweight:** Defined as a BMI **< 18.5 kg/m²**. This individual’s BMI is well above this threshold. * **B. Overweight:** Defined as a BMI **≥ 25.0 kg/m²**. This individual would need to weigh more than 76.5 kg to be classified as overweight. * **C. Obese:** Defined as a BMI **≥ 30.0 kg/m²**. This represents a much higher level of adiposity. **High-Yield Clinical Pearls for NEET-PG:** * **Asian-Indian Specific Criteria:** Due to a higher risk of metabolic syndrome at lower BMIs, the revised criteria for Indians are: * *Normal:* 18.0–22.9 kg/m² * *Overweight:* 23.0–24.9 kg/m² * *Obesity:* ≥ 25.0 kg/m² * **Ponderal Index:** Another measure of leanence; calculated as $Weight (kg) / Height (m)^3$. * **Waist-Hip Ratio:** A better predictor of cardiovascular risk than BMI. Significant risk if **> 0.9 in men** or **> 0.85 in women**.

Q: The Holder method of pasteurization is not effective to kill which of the following organisms?

Coxiella. **Explanation:** The **Holder method** (LTLT - Low Temperature Long Time) involves heating milk to **63°C (145°F) for 30 minutes**, followed by rapid cooling to 5°C. The primary objective of pasteurization is to eliminate common milk-borne pathogens. **Why Coxiella is the correct answer:** *Coxiella burnetii* (the causative agent of Q fever) is the **most heat-resistant** non-spore-forming pathogen found in milk. While the Holder method significantly reduces its numbers, it is not consistently effective at killing all organisms because *Coxiella* can survive temperatures up to 63°C. This led to the development of the **HTST (High Temperature Short Time)** method (72°C for 15 seconds), which is specifically designed to ensure the destruction of *Coxiella burnetii*. **Analysis of Incorrect Options:** * **Mycobacteria:** *Mycobacterium bovis* and *M. tuberculosis* were historically the index organisms for pasteurization. They are effectively killed at 63°C for 30 minutes. * **Brucella:** These organisms are highly sensitive to heat and are easily eradicated by the Holder method, preventing the transmission of Brucellosis via raw milk. * **Salmonella:** Like most enteric pathogens, *Salmonella* species are thermolabile and do not survive the standard pasteurization process. **High-Yield Clinical Pearls for NEET-PG:** * **Index Organism:** *Coxiella burnetii* is now considered the index organism to test the efficiency of pasteurization. * **Phosphatase Test:** This test is used to check the efficacy of pasteurization. It works because the enzyme alkaline phosphatase is naturally present in raw milk and is destroyed at temperatures slightly higher than those required to kill *Mycobacteria*. * **Standard Temperatures:** * Holder Method: 63°C for 30 mins. * HTST Method: 72°C for 15 secs. * UHT (Ultra High Temperature): 125°C+ for a few seconds.

Q: Which amino acid is the limiting amino acid in wheat?

Lysine. **Explanation** The concept of a **limiting amino acid** refers to the essential amino acid present in the lowest quantity relative to the body's requirements in a specific food source. It "limits" the synthesis of proteins because once it is exhausted, the body cannot utilize the remaining amino acids for protein production. **Why Lysine is correct:** Cereals, including **wheat**, rice, and maize, are characteristically deficient in the essential amino acid **Lysine**. While wheat is a primary source of energy and protein in many diets, its biological value is limited by this deficiency. To achieve a "complete protein" profile, wheat must be consumed with pulses (legumes), which are rich in Lysine. **Analysis of Incorrect Options:** * **A. Methionine:** This is the limiting amino acid in **pulses** (legumes) and soybeans. Pulses are rich in Lysine but lack sulfur-containing amino acids like Methionine. * **B. Tryptophan:** This is the limiting amino acid in **Maize** (along with Lysine). A deficiency of Tryptophan in a maize-dependent diet can lead to Pellagra, as Tryptophan is a precursor for Niacin (Vitamin B3). * **D. Isoleucine:** While present in varying amounts in grains, it is rarely the primary "limiting" factor in major staple cereals compared to Lysine or Methionine. **High-Yield NEET-PG Pearls:** * **Mutual Supplementation:** The practice of mixing cereals (deficient in Lysine) with pulses (deficient in Methionine) is called the "supplementary action of proteins." This ensures a balanced intake of all essential amino acids. * **Pulse-Cereal Ratio:** For optimum protein utilization, the recommended ratio of cereal protein to pulse protein is **4:1**. * **Reference Protein:** Egg protein is considered the "standard" or reference protein (Biological Value = 100) because it contains all essential amino acids in the correct proportions.

Q: Which of the following is the richest source of Vitamin D?

Fish oil. **Explanation:** Vitamin D (Calciferol) is a fat-soluble vitamin that functions more like a hormone in the body. While the primary source of Vitamin D is synthesis in the skin via UV-B radiation (the "sunshine vitamin"), dietary sources are essential when sun exposure is inadequate. **Why Fish Oil is the Correct Answer:** Animal-based fats are the most concentrated dietary sources of Vitamin D3 (Cholecalciferol). **Fish liver oils (e.g., Cod liver oil)** are the richest natural sources, containing approximately 100–200 IU per gram. Fatty fish like salmon, mackerel, and sardines are also significant sources. **Analysis of Incorrect Options:** * **Milk:** While often considered a "complete food," natural cow’s milk is actually a **poor source** of Vitamin D. In many countries, milk is fortified with Vitamin D to prevent rickets, but naturally, it contains negligible amounts. * **Egg:** The egg yolk contains Vitamin D, but the concentration is much lower compared to fish liver oils. One egg yolk typically provides only about 40 IU. * **Green Leafy Vegetables:** These are excellent sources of Vitamin A, Vitamin K, and Iron, but they contain **no Vitamin D**. Vitamin D is virtually absent from the plant kingdom (except for some UV-irradiated mushrooms). **High-Yield Clinical Pearls for NEET-PG:** * **Daily Requirement:** The ICMR (2020) recommends 600 IU/day for most age groups if sun exposure is limited. * **Active Form:** 1,25-dihydroxycholecalciferol [1,25-(OH)₂D₃] or Calcitriol. * **Storage Form:** 25-hydroxyvitamin D [25-(OH)D], which is measured to assess clinical deficiency. * **Deficiency:** Leads to **Rickets** in children (craniotabes, rachitic rosary) and **Osteomalacia** in adults (bone pain, pseudofractures/Looser's zones).

Q: Which grain shows the highest calcium content?

Ragi. **Explanation:** The correct answer is **Ragi (Finger Millet)**. Among all cereals and millets, Ragi is uniquely distinguished by its exceptionally high calcium content, making it a vital dietary component for bone health and the prevention of metabolic bone diseases. **Why Ragi is correct:** Ragi contains approximately **344 mg of calcium per 100g**. This is significantly higher (nearly 10 times) than that of rice (10 mg/100g) or wheat (41 mg/100g). Because of this high concentration, it is often recommended as a weaning food for infants and a dietary staple for postmenopausal women and the elderly to prevent osteoporosis. **Analysis of Incorrect Options:** * **Jowar (Sorghum):** Contains about 25–30 mg of calcium per 100g. While a good source of fiber, it does not compare to Ragi in mineral density. * **Bajra (Pearl Millet):** Contains about 42 mg of calcium per 100g. It is, however, the richest source of **Iron** among common millets (approx. 8 mg/100g). * **Sorghum:** This is simply the botanical name for Jowar (Option A), and thus carries the same nutritional profile. **High-Yield Clinical Pearls for NEET-PG:** * **Calcium King:** Ragi (344 mg/100g). * **Iron King:** Bajra (8 mg/100g). * **Pellagragenic Grain:** Maize and Jowar are associated with Pellagra because they are high in Leucine, which interferes with the conversion of Tryptophan to Niacin. * **Limiting Amino Acids:** Most cereals are deficient in **Lysine**, while pulses are deficient in **Methionine**. Ragi is a rare exception as it contains significant amounts of amino acids like methionine.

Q: Dates are a rich source of which of the following?

Iron. ### Explanation **Correct Option: B (Iron)** Dates (*Phoenix dactylifera*) are highly valued in public health nutrition as a concentrated source of energy and essential minerals. Among the options provided, **Iron** is the most significant nutrient found in dates. They contain approximately 1.0 to 3.0 mg of iron per 100g. In the context of Community Medicine and the National Nutritional Programs in India, dates are often recommended as a dietary supplement to combat **Nutritional Anemia**, particularly in pregnant women and adolescent girls, due to their high bioavailability of non-heme iron and natural sugars. **Analysis of Incorrect Options:** * **A. Calcium:** While dates contain modest amounts of calcium, they are not considered a primary or "rich" source compared to dairy products, ragi, or green leafy vegetables. * **C. Vitamin C:** Dates are notably deficient in Vitamin C (Ascorbic acid). Most dried fruits lose their minimal Vitamin C content during the curing/drying process. * **D. Carotene:** Dates contain negligible amounts of Vitamin A precursors. The primary sources of carotene in the Indian diet are yellow-orange fruits (mango, papaya) and dark green leafy vegetables. **High-Yield Clinical Pearls for NEET-PG:** * **Energy Density:** Dates provide roughly 280 kcal per 100g, making them an excellent source of rapid energy (fructose and glucose). * **Fiber Content:** They are rich in dietary fiber, aiding in the prevention of constipation. * **Potassium:** Dates are an exceptional source of Potassium (approx. 600mg/100g), which is vital for electrolyte balance and cardiovascular health. * **Exam Tip:** If a question asks for the "richest" source of Iron among fruits, **Dry Karonda** (39mg/100g) and **Dates** are frequent high-yield answers.

Q: Which one of the following pulses has the highest content of iron?

Soyabean. **Explanation:** The correct answer is **Soyabean**. In the context of nutritional epidemiology, pulses are a vital source of protein and minerals in the Indian diet. Among the common pulses, Soyabean (*Glycine max*) stands out as a nutritional powerhouse. **Why Soyabean is correct:** Soyabean contains the highest amount of iron among the options provided, with approximately **10.4 mg of iron per 100g**. Beyond iron, it is also the richest plant source of protein (approx. 40-43%) and contains significant amounts of calcium and B-vitamins. **Analysis of incorrect options:** While all pulses are good sources of iron, their concentrations are lower than that of Soyabean: * **Bengal gram (Chickpea):** Contains approximately 4.6 mg to 5.3 mg of iron per 100g. * **Black gram (Urad dal):** Contains approximately 3.8 mg to 6 mg of iron per 100g. * **Red gram (Arhar/Tur dal):** Contains approximately 2.7 mg per 100g, making it one of the lower iron-containing pulses. **High-Yield Clinical Pearls for NEET-PG:** * **Iron Absorption:** Although pulses are high in iron, it is **non-heme iron**, which has lower bioavailability than heme iron (found in meat). Absorption is enhanced by Vitamin C (Ascorbic acid) and inhibited by phytates/oxalates present in the pulses. * **Protein Quality:** Soyabean is considered a "complete" plant protein because it contains all essential amino acids, unlike most other pulses which are deficient in methionine. * **Limiting Amino Acids:** Remember the "Pulse-Cereal" synergy: Pulses are generally deficient in **Methionine** but rich in **Lysine**, while Cereals are deficient in **Lysine** but rich in **Methionine**. * **Lathyrism:** Always associate *Lathyrus sativus* (Khesari dal) with BOAA/ODAP neurotoxicity, a common "distractor" in pulse-related questions.

Question 1

In the WHO 'Road to health card' (growth chart), what does the upper reference line represent?

Accepted Answer

50th percentile for boys

Answer

80th percentile for boys

Answer

50th percentile for girls

Answer

80th percentile for girls

Question 2

What is the net protein utilization of fish?

Accepted Answer

77%

Answer

57%

Answer

67%

Answer

87%

Question 3

What is the best site for measuring skin fold thickness?

Accepted Answer

Mid triceps

Answer

Subscapular region

Answer

Abdominal region

Answer

Mid thighs

Question 4

A 70 kg man with a height of 1.75 m will have a BMI in which range?

Accepted Answer

Normal

Answer

Underweight

Answer

Overweight

Answer

Obese

Question 5

The Holder method of pasteurization is not effective to kill which of the following organisms?

Accepted Answer

Coxiella

Answer

Brucella

Answer

Mycobacteria

Answer

Salmonella

Question 6

Which amino acid is the limiting amino acid in wheat?

Accepted Answer

Lysine

Answer

Methionine

Answer

Tryptophan

Answer

Isoleucine

Question 7

Which of the following is the richest source of Vitamin D?

Accepted Answer

Fish oil

Answer

Milk

Answer

Egg

Answer

Green leafy vegetables

Question 8

Which grain shows the highest calcium content?

Accepted Answer

Ragi

Answer

Jowar

Answer

Bajra

Answer

Sorghum

Question 9

Dates are a rich source of which of the following?

Accepted Answer

Iron

Answer

Calcium

Answer

Vitamin C

Answer

Carotene

Question 10

Which one of the following pulses has the highest content of iron?

Accepted Answer

Soyabean

Answer

Bengal gram

Answer

Black gram

Answer

Red gram

Nutrition and Health — MCQs

Nutrition and Health — MCQs

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