Nutrition and Health — MCQs

Nutrition and Health Indian Medical PG Practice Questions and MCQs

Question 171: All of the following methods are used to test pasteurization of milk except?

A. Phosphatase test
B. Standard plate count test
C. Coliform count
D. Holder (Vat) method (Correct Answer)

Explanation: **Explanation:** The core concept tested here is the distinction between **methods of pasteurization** (the process) and **tests for pasteurization** (the quality control). **Why Option D is the correct answer:** The **Holder (Vat) method** is a *method* of pasteurization, not a test to verify it. In this process, milk is heated to 63°C (145°F) for 30 minutes and then quickly cooled to 5°C. Since the question asks for "tests" used to check the efficacy of pasteurization, the Holder method is the odd one out. **Analysis of Incorrect Options (Tests for Milk):** * **A. Phosphatase Test:** This is the most important test for pasteurization. The enzyme alkaline phosphatase is naturally present in raw milk and is destroyed at temperatures slightly higher than those required to kill the most heat-resistant non-spore-forming pathogens (e.g., *Coxiella burnetii*). A negative phosphatase test indicates successful pasteurization. * **B. Standard Plate Count (SPC):** This measures the total number of viable aerobic bacteria in the milk. It is used to assess the sanitary quality and shelf-life of the milk post-pasteurization. * **C. Coliform Count:** Coliforms are usually killed by pasteurization. Their presence in pasteurized milk indicates post-processing contamination (fecal-oral route or poor hygiene). **High-Yield Clinical Pearls for NEET-PG:** * **HTST (High-Temperature Short-Time):** The most common commercial method (72°C for 15 seconds). * **Methylene Blue Reduction Test (MBRT):** Used to check the **bacteriological quality of raw milk** before processing. Rapid decolorization indicates high bacterial load (poor quality). * **Phosphatase Test** is the "Gold Standard" for checking the adequacy of pasteurization. * **Coxiella burnetii** (Q fever) is the most heat-resistant pathogen found in milk, used as the indicator organism for setting pasteurization temperatures.

Question 172: Which of the following statements about the Gomez classification of malnutrition is false?

A. It is based on height retardation. (Correct Answer)
B. It uses the 50th percentile Boston standards.
C. A value between 75 and 89% implies mild malnutrition.
D. This classification has prognostic value for hospitalization of children.

Explanation: ### Explanation The **Gomez classification** is one of the earliest methods used to assess protein-energy malnutrition (PEM) in children. **1. Why Option A is the Correct Answer (False Statement):** The Gomez classification is based **exclusively on weight-for-age**, not height. It measures the child's current weight as a percentage of the expected weight for a child of the same age. Height retardation (stunting) is a feature of the **Waterlow classification**, which distinguishes between acute malnutrition (wasting) and chronic malnutrition (stunting). **2. Analysis of Other Options:** * **Option B:** Gomez used the **50th percentile of the Boston Standards** (Harvard Standards) as the reference point for "normal" weight-for-age. * **Option C:** The classification grades are: * **Normal:** >90% of expected weight. * **Grade I (Mild):** 75–89%. * **Grade II (Moderate):** 60–74%. * **Grade III (Severe):** <60% (includes all cases of edema/Kwashiorkor regardless of weight). * **Option D:** It has significant **prognostic value**; children in Grade II and III have a higher risk of morbidity and mortality, often requiring hospitalization and intensive nutritional rehabilitation. ### High-Yield Clinical Pearls for NEET-PG * **Formula:** (Observed weight / Weight of normal child of same age) × 100. * **Limitation:** It does not differentiate between **stunting** (chronic) and **wasting** (acute) and does not account for the presence of edema. * **IAP Classification:** A common alternative in India, which also uses weight-for-age but defines Grade III as 50–60% and Grade IV as <50%. * **Current Standard:** The WHO Growth Charts (Z-scores) have largely replaced Gomez in clinical practice for assessing malnutrition.

Question 173: What is the approximate protein content in soybean?

A. 43% (Correct Answer)
B. 50%
C. 58%
D. 64%

Explanation: **Explanation:** Soybean (*Glycine max*) is recognized as the richest plant-based source of protein, often referred to as "meat without bones." 1. **Why 43% is correct:** According to standard nutritional textbooks (Park’s PSM), soybean contains approximately **40–43% protein**. It is a unique legume because it provides a "complete protein" profile, containing all essential amino acids in proportions similar to animal protein. It is particularly rich in **Lysine**, making it an excellent supplement to cereal-based diets which are typically lysine-deficient. 2. **Why other options are incorrect:** * **50%:** While "Soy Protein Isolate" (a processed derivative) can contain up to 90% protein, and "Soy flour" may reach 50%, the raw whole soybean itself does not naturally reach this concentration. * **58% and 64%:** These values are significantly higher than the biological limit of the soybean seed. No natural legume or pulse contains protein in this high a concentration; such levels are only achieved through industrial extraction and concentration. **High-Yield Clinical Pearls for NEET-PG:** * **Biological Value:** Soybean has a high biological value (approx. 70), which is the highest among plant sources. * **Limiting Amino Acid:** Like most pulses, soybean is relatively deficient in **Methionine** (sulfur-containing amino acid). * **Fat Content:** Soybean contains about **20% fat**, making it a major source of edible oil. * **Antinutritional Factors:** Raw soybeans contain **Trypsin inhibitors** and goitrogens, which are inactivated by heat (cooking). * **Comparison:** For context, other pulses (dal) typically contain 20–25% protein, while cereals (rice/wheat) contain 6–12%.

Question 174: Pasteurization of milk is a type of prevention?

A. Primary prevention (Correct Answer)
B. Secondary prevention
C. Tertiary prevention
D. None of the above

Explanation: ### Explanation **1. Why Primary Prevention is Correct:** Primary prevention aims to prevent the onset of disease by controlling causes and risk factors. It is applied during the **pre-pathogenesis phase** (before the disease process has started). Pasteurization of milk is a classic example of **Specific Protection**, which is a mode of intervention under primary prevention. By heating milk to specific temperatures (e.g., 63°C for 30 mins or 72°C for 15 secs), we eliminate pathogenic organisms like *Mycobacterium bovis*, *Brucella*, and *Salmonella*, thereby preventing diseases like Bovine TB and Brucellosis before they can infect a human host. **2. Why Other Options are Incorrect:** * **Secondary Prevention:** This involves **early diagnosis and prompt treatment**. It focuses on the pathogenesis phase to stop disease progression and prevent complications (e.g., Pap smears, sputum microscopy for TB). Pasteurization does not treat an existing disease; it prevents it from occurring. * **Tertiary Prevention:** This focuses on **disability limitation and rehabilitation** for late-stage disease (e.g., physiotherapy after a stroke). It aims to reduce impairments and improve quality of life. * **Primordial Prevention:** (Though not an option, it is a common distractor). This involves preventing the *emergence* of risk factors in a population (e.g., discouraging children from starting smoking). Pasteurization deals with an existing risk factor (contaminated milk), making it Primary, not Primordial. **3. Clinical Pearls for NEET-PG:** * **Phosphatase Test:** Used to check the efficiency of pasteurization (the enzyme phosphatase is destroyed if pasteurization is successful). * **Standard Temperatures:** * **Holder Method:** 63°C (145°F) for 30 minutes. * **HTST (High Temperature Short Time):** 72°C (161°F) for 15 seconds. * **Note:** Pasteurization kills pathogens but does **not** sterilize milk (thermophilic bacteria and spores may survive). * **Coxiella burnetii:** The most heat-resistant non-spore-forming pathogen found in milk; it is the index organism used to set pasteurization standards.

Question 175: All are features of epidemic dropsy, except?

A. Glaucoma
B. Diarrhoea
C. Convulsion (Correct Answer)
D. Heart failure

Explanation: **Explanation** Epidemic dropsy is a clinical condition caused by the ingestion of edible oils (usually mustard oil) adulterated with **Argemone mexicana** oil. The toxic alkaloid responsible is **Sanguinarine**, which interferes with oxidation-reduction reactions and increases capillary permeability. **Why Convulsion is the correct answer:** Convulsions are **not** a feature of epidemic dropsy. The disease primarily affects the cardiovascular and ocular systems through widespread capillary dilatation and leakage. While it can cause significant systemic distress, it does not typically involve the central nervous system to the extent of causing seizures. **Analysis of incorrect options:** * **Glaucoma (Option A):** This is a classic, high-yield feature. It is typically **bilateral, open-angle glaucoma** caused by increased capillary pressure in the ciliary body. * **Diarrhoea (Option B):** Gastrointestinal symptoms, including nausea, vomiting, and diarrhoea, are common early manifestations of the toxicity. * **Heart Failure (Option C):** Sudden **congestive heart failure** (right-sided) is the most common cause of death in epidemic dropsy, resulting from increased cardiac workload and capillary damage. **NEET-PG High-Yield Pearls:** 1. **Toxic Agent:** Sanguinarine (interferes with Pyruvate Dehydrogenase). 2. **Diagnostic Test:** **Nitric Acid Test** (turns orange-red) or the more sensitive **Paper Chromatography**. 3. **Clinical Triad:** Bilateral pitting edema (dropsy), Gastrointestinal disturbances, and Glaucoma. 4. **Cutaneous Sign:** **Sarcoid-like erythema** or telangiectasia (vascular mottling of the skin). 5. **Treatment:** No specific antidote; removal of the adulterated oil and supportive care (antioxidants like Vitamin C and E) are key.

Question 176: According to the World Health Organization (WHO), a person is considered underweight if their Body Mass Index (BMI) is:

A. Less than 18.5 (Correct Answer)
B. Less than 25
C. Less than 30
D. Less than 35

Explanation: **Explanation:** Body Mass Index (BMI), also known as the **Quetelet Index**, is a simple index of weight-for-height that is commonly used to classify underweight, overweight, and obesity in adults. It is defined as the weight in kilograms divided by the square of the height in metres ($kg/m^2$). **Why Option A is Correct:** According to the WHO international classification, a BMI of **less than 18.5 $kg/m^2$** is the threshold for **Underweight**. This category is further subdivided into Mild (17.0–18.49), Moderate (16.0–16.99), and Severe thinness (<16.0). **Analysis of Incorrect Options:** * **Option B (<25):** This is the upper limit of the "Normal" range (18.5–24.9). A BMI $\geq$ 25 is classified as Overweight (Pre-obese). * **Option C (<30):** A BMI $\geq$ 30 is the diagnostic cutoff for **Obesity**. * **Option D (<35):** A BMI of 30.0–34.9 is classified as Class I Obesity. **High-Yield Clinical Pearls for NEET-PG:** 1. **Asian-Indian Specific Criteria:** Due to a higher risk of metabolic syndrome at lower BMIs, the consensus guidelines for Indians are different: * **Underweight:** <18.5 * **Normal:** 18.5–22.9 * **Overweight:** 23.0–24.9 * **Obese:** $\geq$ 25 2. **Ponderal Index:** Another measure of leanence ($Weight/Height^3$). 3. **Gold Standard:** While BMI is widely used, it does not distinguish between muscle mass and fat mass. **Waist-Hip Ratio** (Normal: Men <0.9, Women <0.85) is a better predictor of central obesity and cardiovascular risk.

Question 177: Aflatoxin is produced by which of the following microorganisms?

A. Aspergillus niger
B. Aspergillus flavus (Correct Answer)
C. Candida albicans
D. Actinomycetes

Explanation: **Explanation:** **Correct Answer: B. Aspergillus flavus** Aflatoxins are potent mycotoxins produced primarily by the fungi **Aspergillus flavus** and **Aspergillus parasiticus**. These molds commonly contaminate dietary staples such as groundnuts (peanuts), maize, and cereals, especially under conditions of high humidity and poor storage. **Why the correct answer is right:** The term "Aflatoxin" is derived from the name of the fungus: **A**-spergillus **fla**-vus **toxin**. These toxins are highly hepatotoxic and are recognized as potent carcinogens. Chronic exposure is a major risk factor for **Hepatocellular Carcinoma (HCC)**, as the toxin causes a specific mutation in the **p53 tumor suppressor gene** (codon 249). **Analysis of Incorrect Options:** * **A. Aspergillus niger:** Known as "black mold," it is commonly used in the industrial production of citric acid and gluconic acid. It is not a producer of aflatoxins. * **C. Candida albicans:** A yeast that is part of the normal human flora. It is an opportunistic pathogen causing oral thrush, vaginal candidiasis, and systemic infections, but it does not produce mycotoxins. * **D. Actinomycetes:** These are gram-positive bacteria (not fungi) that resemble fungi due to their filamentous structure. They are primarily known for producing antibiotics (e.g., Streptomycin) rather than dietary toxins. **High-Yield Clinical Pearls for NEET-PG:** * **Target Organ:** Liver (Acute: Hepatitis; Chronic: Cirrhosis and HCC). * **Detection:** Aflatoxins show **blue or green fluorescence** under UV light. * **Prevention:** Moisture content in stored grains should be kept **below 10%** to prevent fungal growth. * **Other Mycotoxins:** Ergotism (Claviceps purpurea) and Alimentary Toxic Aleukia (Fusarium).

Question 178: Which parameter is most sensitive for monitoring an iodine deficiency control program in a community?

A. Neonatal hypothyroidism (Correct Answer)
B. Goitre
C. Growth retardation
D. Urinary T3, T4 levels

Explanation: The correct answer is **Neonatal Hypothyroidism** (specifically measured via Neonatal TSH levels). ### 1. Why Neonatal Hypothyroidism is the Correct Answer In the context of Iodine Deficiency Disorders (IDD), the **Neonatal TSH level** is considered the most sensitive indicator for monitoring the impact of iodine prophylaxis in a community. This is because the fetal and neonatal thyroid is extremely sensitive to iodine depletion. Even mild iodine deficiency in the mother results in a transient rise in TSH levels in the newborn. * **Threshold:** If more than 3% of newborns in a community have TSH levels >5 mU/L in whole blood, it indicates a public health problem. It reflects the **current** iodine status of the population. ### 2. Why Other Options are Incorrect * **Goitre (Option B):** While the Total Goitre Rate (TGR) is a classic indicator used for **baseline prevalence** and mapping, it is slow to respond to iodine supplementation. Goitres (especially large ones) may take years to regress, making it a poor tool for monitoring immediate program effectiveness. * **Growth Retardation (Option C):** This is a non-specific finding. It can be caused by protein-energy malnutrition, chronic infections, or other endocrine issues, making it unreliable for monitoring iodine-specific programs. * **Urinary T3, T4 levels (Option D):** These are not used for community monitoring. Instead, **Urinary Iodine Excretion (UIE)** is the standard biochemical marker. However, UIE reflects recent intake (days), whereas neonatal TSH reflects the biological impact on the most vulnerable group. ### 3. Clinical Pearls for NEET-PG * **Most Sensitive Indicator:** Neonatal TSH. * **Best Indicator for Current Iodine Status:** Urinary Iodine Excretion (UIE). * **Indicator for Long-term Impact/Prevalence:** Total Goitre Rate (TGR). * **Salt Iodization Goal:** At least 15 ppm iodine at the consumer level and 30 ppm at the production level.

Question 179: Which of the following is NOT an essential fatty acid?

A. Linoleic acid
B. Linolenic acid
C. Oleic acid (Correct Answer)
D. Arachidonic acid

Explanation: **Explanation:** The concept of **Essential Fatty Acids (EFAs)** refers to fatty acids that the human body cannot synthesize de novo because it lacks the enzymes (desaturases) necessary to insert double bonds at the n-3 or n-6 positions. Therefore, they must be obtained through the diet. **Why Oleic Acid is the Correct Answer:** **Oleic acid (Option C)** is a Monounsaturated Fatty Acid (MUFA) with the formula 18:1 n-9. Unlike EFAs, the human body can synthesize oleic acid from saturated fatty acids. Since it is produced endogenously, it is classified as a **non-essential fatty acid**. **Analysis of Incorrect Options:** * **Linoleic acid (Option A):** An omega-6 (n-6) polyunsaturated fatty acid (PUFA). It is a primary EFA and serves as a precursor for arachidonic acid. * **Linolenic acid (Option B):** Specifically Alpha-Linolenic Acid (ALA), an omega-3 (n-3) PUFA. It is a primary EFA and a precursor for EPA and DHA. * **Arachidonic acid (Option D):** An omega-6 PUFA. While it can be synthesized from linoleic acid, it is often considered "semi-essential." If linoleic acid is deficient in the diet, arachidonic acid becomes essential. **High-Yield Clinical Pearls for NEET-PG:** * **Primary EFAs:** Only Linoleic and Linolenic acids are strictly essential. * **Functions:** EFAs are vital for cell membrane structure, prostaglandin synthesis, and cholesterol transport. * **Deficiency:** EFA deficiency leads to **Phrynoderma** (follicular hyperkeratosis or "toad skin"), characterized by horny papules on the posterior and lateral aspects of the limbs. * **Energy Value:** Like all fats, EFAs provide **9 kcal/g**. * **P:S Ratio:** For a balanced diet, the Polyunsaturated to Saturated fatty acid ratio should be **0.8 to 1.0**.

Question 180: What is the approximate protein content of soybeans?

A. 43% (Correct Answer)
B. 50%
C. 58%
D. 58%

Explanation: **Explanation:** **Soybean** is often referred to as the "meat of the field" or "poor man's meat" due to its exceptionally high protein content and quality. 1. **Why 43% is correct:** In Community Medicine and Nutrition, soybean is recognized as the richest source of plant-based protein. It contains approximately **40% to 43% protein**. Unlike most plant proteins, soy is a "complete protein," meaning it contains all nine essential amino acids in sufficient quantities to support human health. It is also rich in fats (20%), minerals, and vitamins. 2. **Analysis of Incorrect Options:** * **50%:** While some processed soy products like "Soy Protein Isolate" can contain up to 90% protein, and "Soy Flour" can reach 50%, the raw soybean itself does not naturally contain 50% protein. * **58%:** This value is significantly higher than the biological composition of a whole soybean. No natural legume or pulse reaches this concentration of protein in its raw form. **High-Yield NEET-PG Pearls:** * **Biological Value (BV):** The BV of soybean is approximately **70**, which is high for a vegetable source but lower than egg (94) or milk (84). * **Limiting Amino Acid:** Like most pulses, soybean is relatively low in **Methionine** (sulfur-containing amino acid) but rich in **Lysine**. This makes it an excellent "supplementary" protein when eaten with cereals (which are low in Lysine but high in Methionine). * **Net Protein Utilization (NPU):** The NPU of soy is around 61. * **Antinutritional Factors:** Raw soybeans contain **Trypsin inhibitors**, which are inactivated by heat (cooking/toasting). * **Comparison:** For the exam, remember: Soybean (43%) > Groundnut (26%) > Pulses/Dal (20-25%) > Cereals (6-12%).

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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