Basic Nutritional Requirements — MCQs
A patient on a maize diet presented with diarrhea, dementia and dermatitis. Which vitamin deficiency is responsible for these features
Which vitamin deficiency is most likely in a 3-year-old presenting with bow legs and delayed dentition?
Decreased basal metabolic rate is seen in:
Vitamin K supplementation is given to neonates to prevent _____ .
What is the recommended daily energy intake in kilocalories for an adult woman engaged in heavy physical labor?
Final common pathway of metabolism of carbohydrate, lipids, and protein metabolism is?
Which of the following anthropometric indicators best reflects acute malnutrition (wasting) in children?
As per the Government of India guidelines, the daily dose of elemental iron recommended for prophylaxis during pregnancy is
Lowering of which of the following parameters indicates acute malnutrition?
In Niacin deficiency, all of the following are seen except?
Basic Nutritional Requirements Indian Medical PG Practice Questions and MCQs
Question 1: A patient on a maize diet presented with diarrhea, dementia and dermatitis. Which vitamin deficiency is responsible for these features
- A. Niacin (Correct Answer)
- B. Riboflavin
- C. Thiamine
- D. Pyridoxine
- E. Cobalamin
Explanation: ***Niacin*** - The classic presentation of **pellagra**, caused by a deficiency of **niacin (Vitamin B3)**, is characterized by the "**3 Ds**": **dermatitis**, **diarrhea**, and **dementia**. In severe cases, a fourth 'D' for death can also occur. - A **maize (corn)** staple diet is a known risk factor for niacin deficiency because maize contains niacin in a bound, non-bioavailable form (niacytin) and is low in tryptophan, a precursor to niacin. *Riboflavin* - **Riboflavin (Vitamin B2)** deficiency leads to **ariboflavinosis**, which can cause **cheilosis**, **angular stomatitis**, **glossitis**, and **seborrheic dermatitis**, but not the constellation of diarrhea, dementia, and dermatitis seen in pellagra. - It does not typically manifest with neurological or gastrointestinal symptoms as severe as those described in the question. *Thiamine* - **Thiamine (Vitamin B1)** deficiency causes **beriberi**, characterized by **neurological (dry beriberi)** or **cardiovascular (wet beriberi)** symptoms. - It can lead to **Wernicke-Korsakoff syndrome** in severe cases, which includes neurological deficits, but not the specific "3 Ds" of pellagra. *Pyridoxine* - **Pyridoxine (Vitamin B6)** deficiency can cause **neurological symptoms** such as **peripheral neuropathy**, **seizures**, and **depression**, as well as **dermatitis** and **glossitis**. - It does not present with the characteristic triad of dermatitis, diarrhea, and dementia seen in pellagra. *Cobalamin* - **Cobalamin (Vitamin B12)** deficiency causes **megaloblastic anemia** and **neurological symptoms** including **subacute combined degeneration** of the spinal cord, **peripheral neuropathy**, and **cognitive changes**. - While it can cause neurological symptoms, it does not present with the classic dermatitis and diarrhea combination seen in pellagra.
Question 2: Which vitamin deficiency is most likely in a 3-year-old presenting with bow legs and delayed dentition?
- A. Vitamin K
- B. Vitamin D (Correct Answer)
- C. Vitamin A
- D. Vitamin C
Explanation: ***Vitamin D*** - **Vitamin D deficiency** leads to **rickets** in children, characterized by impaired bone mineralization, causing **bow legs** (genu varum) due to softened bones. - It also plays a crucial role in tooth development, and a deficiency can result in **delayed dentition**. *Vitamin K* - **Vitamin K** is essential for **blood clotting** and bone metabolism. - Deficiency typically presents with **bleeding disorders** rather than skeletal deformities like bow legs. *Vitamin A* - **Vitamin A** is vital for **vision**, immune function, and epithelial cell differentiation. - Its deficiency is primarily associated with **night blindness** and impaired growth, not rickets or delayed dentition. *Vitamin C* - **Vitamin C deficiency** causes **scurvy**, characterized by weakened connective tissue, leading to symptoms like **gingival bleeding**, joint pain, and poor wound healing. - It does not directly cause bow legs or delayed dentition.
Question 3: Decreased basal metabolic rate is seen in:
- A. Postprandial state
- B. Sedentary lifestyle leading to muscle mass loss
- C. Aging process
- D. Hypothyroidism (Correct Answer)
Explanation: ***Hypothyroidism*** - **Thyroid hormones** (T3 and T4) are the primary regulators of basal metabolic rate (BMR) - **Hypothyroidism** results in decreased production of thyroid hormones, leading to a **significant reduction in BMR** - Clinical manifestations include **weight gain, fatigue, cold intolerance, bradycardia**, and decreased oxygen consumption - This is the **classic pathological condition** associated with decreased BMR in physiology *Sedentary lifestyle leading to muscle mass loss* - While muscle loss does reduce BMR (as muscle is more metabolically active than fat), this is a **chronic lifestyle effect** rather than a primary physiological condition - The decrease in BMR is **gradual and less pronounced** compared to hypothyroidism - Not the primary answer for decreased BMR in medical examinations *Aging process* - Aging does lead to decreased BMR due to **loss of lean muscle mass** and hormonal changes - However, this is a **physiological process** rather than a pathological condition - The decrease is **gradual over decades** and less clinically significant than hypothyroidism *Postprandial state* - The postprandial state (after eating) causes an **increase in metabolic rate** due to the **thermic effect of food (TEF)** - Energy is required for digestion, absorption, and storage of nutrients - This represents a **temporary increase**, not a decrease, in metabolic rate
Question 4: Vitamin K supplementation is given to neonates to prevent _____ .
- A. Hemorrhagic disease of the newborn (Correct Answer)
- B. Scurvy
- C. Keratomalacia
- D. Breast milk jaundice
- E. Rickets
Explanation: ***Hemorrhagic disease of the newborn*** - Neonates have low levels of **vitamin K-dependent clotting factors** (II, VII, IX, X) due to poor placental transfer, sterile gut, and low vitamin K in breast milk. - Vitamin K supplementation at birth prevents potentially life-threatening bleeding episodes, known as **hemorrhagic disease of the newborn (VKDB)**, by ensuring adequate clotting factor production. *Scurvy* - Scurvy is caused by **vitamin C deficiency**, leading to impaired collagen synthesis. - Symptoms include **gingival bleeding**, skin hemorrhages, and poor wound healing, which are distinct from vitamin K deficiency. *Keratomalacia* - Keratomalacia is a severe eye condition resulting from **vitamin A deficiency**, characterized by drying and clouding of the cornea. - It leads to **blindness** and is not related to vitamin K metabolism. *Breast milk jaundice* - Breast milk jaundice is a common and usually benign condition in neonates where **breast milk components** interfere with bilirubin metabolism, prolonging physiological jaundice. - It is not prevented by vitamin K and is entirely distinct from coagulation disorders. *Rickets* - Rickets is caused by **vitamin D deficiency**, resulting in defective bone mineralization and skeletal deformities. - Clinical features include **bowed legs**, rachitic rosary, and delayed fontanelle closure, which are unrelated to coagulation or vitamin K.
Question 5: What is the recommended daily energy intake in kilocalories for an adult woman engaged in heavy physical labor?
- A. 2900 (Correct Answer)
- B. 1800
- C. 2100
- D. 2300
Explanation: ***2900*** - For an adult woman engaging in **heavy physical labor**, a daily energy intake of around **2900 kcal** is often recommended to meet the increased metabolic demands and prevent energy deficit. - This intake supports **sustained physical performance** and maintenance of body weight during strenuous activities. *1800* - An intake of **1800 kcal** is typically insufficient for an adult woman involved in heavy physical labor, as it may lead to **energy deficit**, fatigue, and potential weight loss. - This level is more appropriate for women with a **sedentary lifestyle** or those aiming for weight loss. *2100* - While slightly more than a sedentary intake, **2100 kcal** would likely still be inadequate for an adult woman performing heavy physical labor, potentially resulting in **suboptimal performance** and recovery. - This range is often suitable for women with **moderately active lifestyles**. *2300* - **2300 kcal** is an improvement over lower estimates but still generally falls short of the energy requirements for an adult woman engaged in **heavy physical labor**, impeding **optimal physiological function**. - This intake is more aligned with individuals involved in **light to moderate physical activity**.
Question 6: Final common pathway of metabolism of carbohydrate, lipids, and protein metabolism is?
- A. Gluconeogenesis
- B. TCA (Correct Answer)
- C. HMP pathway
- D. Glycolysis
Explanation: ***TCA (Tricarboxylic Acid Cycle)*** - The **TCA cycle** (also called Krebs cycle or citric acid cycle) is the **final common oxidative pathway** where all three macronutrients converge - **Carbohydrates** → Pyruvate → **Acetyl-CoA** (via pyruvate dehydrogenase) - **Lipids** → Fatty acids → **Acetyl-CoA** (via beta-oxidation) - **Proteins** → Amino acids → **Acetyl-CoA or TCA intermediates** (via deamination/transamination) - Complete oxidation of acetyl-CoA occurs in the TCA cycle, producing **NADH, FADH2, and GTP** for energy production *Gluconeogenesis* - This is a **biosynthetic pathway** that synthesizes glucose from non-carbohydrate precursors (lactate, glycerol, amino acids) - It is an **anabolic process**, not the catabolic final common pathway for energy production from all macronutrients *Glycolysis* - **Carbohydrate-specific pathway** that converts glucose to pyruvate - It is only the initial breakdown pathway for carbohydrates, not the common pathway where lipids and proteins also converge - Pyruvate from glycolysis must enter TCA cycle for complete oxidation *HMP pathway (Pentose Phosphate Pathway)* - Parallel pathway to glycolysis that generates **NADPH** (for biosynthesis and antioxidant defense) and **ribose-5-phosphate** (for nucleotide synthesis) - Processes only **glucose-6-phosphate** from carbohydrate metabolism - Not involved in lipid or protein metabolism integration
Question 7: Which of the following anthropometric indicators best reflects acute malnutrition (wasting) in children?
- A. Height for age
- B. BMI for age
- C. Weight for age
- D. Weight for height (Correct Answer)
Explanation: ***Weight for height*** - **Weight-for-height** is the most sensitive indicator of **acute malnutrition (wasting)** because it measures body mass relative to an individual's height, directly reflecting recent and rapid weight loss. - It helps identify children who are too thin for their height, indicating a current nutritional deficit and is crucial for immediate intervention. *Height for age* - **Height-for-age** is an indicator of **chronic malnutrition (stunting)**, reflecting long-term nutritional deficiencies and skeletal growth faltering. - It does not provide information about recent weight changes or acute nutritional status. *BMI for age* - **BMI-for-age** is a helpful indicator for overall nutritional status, including **overweight and obesity**, and can also reflect stunting or wasting. - However, for specifically identifying **acute wasting**, **weight-for-height** is more direct and sensitive as BMI for age can be influenced by both short-term (weight) and long-term (height) growth. *Weight for age* - **Weight-for-age** is an indicator of **underweight**, which can be a result of either acute (wasting) or chronic (stunting) malnutrition, or both. - It does not distinguish between these two forms of malnutrition, making it less specific for identifying **acute wasting** compared to weight-for-height.
Question 8: As per the Government of India guidelines, the daily dose of elemental iron recommended for prophylaxis during pregnancy is
- A. 150 mg/day for 100 days
- B. 200 mg/day for 100 days
- C. 100 mg/day for 100 days (Correct Answer)
- D. 50 mg/day for 100 days
Explanation: ***100 mg/day for 100 days*** - As per the **Government of India guidelines**, the recommended daily dose of **elemental iron** for prophylaxis during pregnancy is 100 mg/day. - This dose is typically continued for at least **100 days** to ensure adequate iron stores and prevent iron deficiency anemia. *150 mg/day for 100 days* - This dose exceeds the **recommended daily prophylactic** amount of elemental iron specified by Indian government guidelines. - While higher doses may be used for **therapeutic treatment** of existing iron deficiency anemia, it is not the standard for prophylaxis. *200 mg/day for 100 days* - This amount is significantly higher than the standard **prophylactic recommendation** for elemental iron during pregnancy in India. - Such a high dose would typically only be prescribed for **treating severe anemia**, not for routine prevention. *50 mg/day for 100 days* - This dose is lower than the **recommended daily amount** for effective iron prophylaxis according to the Government of India guidelines. - Such a dose might be **insufficient** to maintain adequate iron levels and prevent anemia during pregnancy.
Question 9: Lowering of which of the following parameters indicates acute malnutrition?
- A. Weight for age
- B. Weight for height (Correct Answer)
- C. Height for age
- D. Body Mass Index (BMI)
Explanation: **Explanation:** In pediatric nutritional assessment, different anthropometric indices reflect different durations and types of nutritional stress. **1. Why "Weight for Height" is correct:** **Weight for height** is the primary indicator of **acute malnutrition** (also known as **Wasting**). Weight is a sensitive parameter that fluctuates rapidly in response to recent nutritional deficiencies or acute illnesses (like diarrhea or respiratory infections). When a child’s weight is low relative to their height, it signifies a recent and severe process of weight loss, indicating an acute nutritional emergency. **2. Analysis of Incorrect Options:** * **Weight for Age (Underweight):** This is a composite indicator that reflects both acute and chronic malnutrition. It does not distinguish between a child who is short (stunted) and a child who is thin (wasted). * **Height for Age (Stunting):** This indicates **chronic malnutrition**. Linear growth retardation occurs over a long period due to persistent nutritional deprivation or recurrent infections. It represents "past" or long-term nutritional status. * **Body Mass Index (BMI):** While used in adults and older children, in the context of standard WHO pediatric growth monitoring for acute malnutrition, "Weight for Height" is the specific gold-standard parameter used to define wasting. **Clinical Pearls for NEET-PG:** * **Wasting (Acute):** Weight for Height < -2 SD. * **Stunting (Chronic):** Height for Age < -2 SD. * **Underweight (Composite):** Weight for Age < -2 SD. * **Mid-Upper Arm Circumference (MUAC):** A MUAC < 11.5 cm is a quick screening tool for Severe Acute Malnutrition (SAM) in children aged 6–59 months. * **Gomez Classification:** Based on Weight for Age. * **Waterlow’s Classification:** Uses Weight for Height (Wasting) and Height for Age (Stunting).
Question 10: In Niacin deficiency, all of the following are seen except?
- A. Deafness (Correct Answer)
- B. Diarrhea
- C. Dementia
- D. Dermatitis
Explanation: ### Explanation Niacin (Vitamin B3) deficiency leads to a clinical condition known as **Pellagra**. This condition is classically characterized by the **"3 Ds"**: Dermatitis, Diarrhea, and Dementia. If left untreated, it progresses to a 4th D: Death. **Deafness** is not a feature of Niacin deficiency, making it the correct answer for this "except" question. #### Analysis of Options: * **Dermatitis (Option D):** This is typically the most characteristic sign. It presents as a symmetrical, photosensitive rash. A well-known clinical sign is **Casal’s necklace**, where the dermatitis forms a ring-like pattern around the neck. * **Diarrhea (Option B):** Gastrointestinal involvement is common due to inflammation of the mucosal lining, leading to chronic diarrhea, glossitis (magenta tongue), and stomatitis. * **Dementia (Option C):** Neurological manifestations include irritability, poor concentration, and depression, which can progress to full-blown dementia, tremors, and eventually coma. * **Deafness (Option A):** Hearing loss is not associated with Niacin deficiency. It is more commonly linked to congenital infections (TORCH), certain drugs (ototoxicity), or deficiencies like Iodine (endemic cretinism). #### NEET-PG High-Yield Pearls: * **Precursor:** Niacin is synthesized from the amino acid **Tryptophan** (60 mg Tryptophan = 1 mg Niacin). * **Dietary Links:** Pellagra is historically associated with **Maize (Corn)** or **Jowar (Sorghum)** based diets. Maize is deficient in Tryptophan and contains Niacin in a bound, unabsorbable form (Niacytin). Jowar contains high levels of **Leucine**, which interferes with Tryptophan metabolism. * **Hartnup Disease:** A genetic disorder affecting Tryptophan absorption that can present with Pellagra-like symptoms. * **Carcinoid Syndrome:** Can lead to Niacin deficiency because Tryptophan is diverted to produce excessive Serotonin.
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