Q. 1
Dietetics
Difficulty: Easy
(1 Mark)
What are the physiological energy yield values (Atwater factors) per gram of Carbohydrate, Protein, and Lipid, respectively?
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Step-by-Step Explanation & Concept Rationale
Standard physiological fuel values (Atwater factors) are 4 kcal/g for carbohydrates, 4 kcal/g for proteins, and 9 kcal/g for lipids (alcohol yields 7 kcal/g).
Q. 2
Dietetics
Difficulty: Easy
(1 Mark)
Which of the following is an essential amino acid that must be supplied through dietary intake because the human body cannot synthesize it?
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Step-by-Step Explanation & Concept Rationale
The 9 essential amino acids are: Phenylalanine, Valine, Threonine, Tryptophan, Isoleucine, Methionine, Histidine, Leucine, and Lysine (mnemonic: PVT TIM HaLL).
Q. 3
Dietetics
Difficulty: Easy
(1 Mark)
Bitot's spots (foamy plaques on the bulbar conjunctiva) and xerophthalmia are classic clinical signs of deficiency of:
💡
Step-by-Step Explanation & Concept Rationale
Vitamin A deficiency impairs rhodopsin synthesis causing night blindness (nyctalopia), conjunctival xerosis, Bitot's spots, corneal ulceration, and keratomalacia.
Q. 4
Dietetics
Difficulty: Easy
(1 Mark)
The clinical manifestation of 'Pellagra', characterized by the '4 Ds' (Diarrhea, Dermatitis, Dementia, Death), is caused by severe deficiency of:
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Step-by-Step Explanation & Concept Rationale
Niacin (Vitamin B3) or its precursor tryptophan deficiency produces Pellagra, characterized by bilateral symmetrical photosensitive dermatitis (Casal's necklace), diarrhea, dementia, and death.
Q. 5
Dietetics
Difficulty: Easy
(1 Mark)
Wernicke-Korsakoff syndrome, characterized by ataxia, ophthalmoplegia, and confabulation, is caused by acute deficiency of:
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Step-by-Step Explanation & Concept Rationale
Thiamine pyrophosphate (TPP) deficiency, frequently encountered in chronic alcoholism or severe malnutrition/hyperemesis, leads to Wernicke's encephalopathy and wet/dry Beriberi.
Q. 6
Dietetics
Difficulty: Easy
(1 Mark)
Which vitamin functions as a coenzyme in the gamma-carboxylation of glutamic acid residues in blood clotting factors II, VII, IX, and X?
💡
Step-by-Step Explanation & Concept Rationale
Vitamin K (phylloquinone/menaquinone) is the required cofactor for gamma-glutamyl carboxylase, which converts glutamate to gamma-carboxyglutamate (Gla) on clotting factors II, VII, IX, X, and protein C/S.
Q. 7
Dietetics
Difficulty: Medium
(1 Mark)
Subacute combined degeneration of the spinal cord (loss of vibration and position sense) alongside megaloblastic anemia is diagnostic of deficiency of:
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Step-by-Step Explanation & Concept Rationale
While both Folate and B12 deficiency produce megaloblastic anemia, ONLY Vitamin B12 deficiency leads to progressive neurological demyelination (subacute combined degeneration) due to defective myelin methylation.
Q. 8
Dietetics
Difficulty: Easy
(1 Mark)
Non-heme iron absorption from plant foods is significantly enhanced in the intestinal lumen by the simultaneous consumption of:
💡
Step-by-Step Explanation & Concept Rationale
Ascorbic acid reduces ferric iron (Fe3+) to the more soluble ferrous iron (Fe2+) and forms a chelate in the duodenum, substantially enhancing non-heme iron absorption.
Q. 9
Dietetics
Difficulty: Medium
(1 Mark)
Severe deficiency of which trace element causes dwarfism, hypogonadism, impaired wound healing, and acrodermatitis enteropathica?
💡
Step-by-Step Explanation & Concept Rationale
Zinc is a cofactor for > 300 metalloenzymes (DNA/RNA polymerases, alkaline phosphatase). Deficiency impairs cell proliferation, immunity, gustatory acuity (hypogeusia), and wound healing.
Q. 10
Dietetics
Difficulty: Medium
(1 Mark)
Dietary fiber that dissolves in water to form a gel-like matrix (e.g., pectin, beta-glucan in oats) is clinically effective in:
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Step-by-Step Explanation & Concept Rationale
Soluble dietary fiber binds bile acids in the gut to promote their fecal excretion (lowering LDL cholesterol) and slows carbohydrate absorption, smoothing postprandial glucose curves.
Q. 11
Dietetics
Difficulty: Easy
(1 Mark)
The active hormonal form of Vitamin D synthesized in the kidneys is:
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Step-by-Step Explanation & Concept Rationale
In the kidney, 1-alpha-hydroxylase converts 25(OH)D into 1,25(OH)2D (calcitriol), the biologically active hormone that stimulates intestinal calcium and phosphate absorption.
Q. 12
Dietetics
Difficulty: Medium
(1 Mark)
Which essential fatty acid belongs to the omega-3 family and is a metabolic precursor for EPA and DHA?
💡
Step-by-Step Explanation & Concept Rationale
Alpha-linolenic acid (ALA, 18:3 n-3) is the plant-derived essential omega-3 fatty acid, while Linoleic acid (LA, 18:2 n-6) is the parent omega-6 fatty acid.
Q. 13
Dietetics
Difficulty: Easy
(1 Mark)
Deficiency of dietary iodine during gestation and early infancy causes irreversible mental retardation and stunted growth, known as:
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Step-by-Step Explanation & Concept Rationale
Iodine is indispensable for thyroid hormone (T3/T4) synthesis. Severe gestational and neonatal iodine deficiency causes endemic cretinism (neurological and myxedematous forms).
Q. 14
Dietetics
Difficulty: Medium
(1 Mark)
What is the primary biological function of Vitamin E (alpha-tocopherol) in human cells?
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Step-by-Step Explanation & Concept Rationale
Vitamin E is the major lipid-soluble antioxidant in plasma membranes and lipoproteins, scavenging peroxyl free radicals and halting the propagation of polyunsaturated fatty acid peroxidation.
Q. 15
Dietetics
Difficulty: Hard
(1 Mark)
Which nutrient provides the primary metabolic fuel for enterocytes (intestinal epithelial cells) and immune cells?
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Step-by-Step Explanation & Concept Rationale
Glutamine is the principal respiratory fuel for rapidly dividing intestinal mucosal enterocytes and lymphocytes, maintaining gut mucosal barrier integrity during stress and illness.
Q. 16
Dietetics
Difficulty: Easy
(1 Mark)
The glycemic index (GI) of a carbohydrate food represents:
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Step-by-Step Explanation & Concept Rationale
Glycemic Index ranks foods based on the 2-hour postprandial incremental area under the blood glucose response curve (AUC) relative to 50g of pure glucose (GI = 100).
Q. 17
Dietetics
Difficulty: Easy
(1 Mark)
Cheilosis (angular stomatitis), glossitis (magenta tongue), and corneal vascularization are classic signs of deficiency of:
💡
Step-by-Step Explanation & Concept Rationale
Ariboflavinosis (Vitamin B2 deficiency) characteristically manifests with angular stomatitis, cheilosis, magenta tongue, and seborrheic dermatitis of the nasolabial folds.
Q. 18
Dietetics
Difficulty: Medium
(1 Mark)
Which dietary factor inhibits calcium and zinc absorption by binding them into insoluble mineral complexes in the intestine?
💡
Step-by-Step Explanation & Concept Rationale
Phytic acid (myo-inositol hexakisphosphate) found in whole-wheat bran and legumes binds divalent cations (Ca2+, Zn2+, Fe2+) into insoluble chelates, reducing their bioavailability.
Q. 19
Dietetics
Difficulty: Medium
(1 Mark)
In medical nutrition therapy for pre-dialysis Chronic Kidney Disease (CKD Stages 3-4), what is the recommended daily dietary protein intake to slow progression?
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Step-by-Step Explanation & Concept Rationale
KDIGO guidelines recommend restricting protein to 0.6-0.8 g/kg/day in non-dialysis CKD to diminish intraglomerular pressure and uremic toxin generation. Once on hemodialysis, protein is increased to 1.2 g/kg/day.
Q. 20
Dietetics
Difficulty: Easy
(1 Mark)
Which medical diet is universally mandated for patients with Celiac Disease (Gluten-Sensitive Enteropathy)?
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Step-by-Step Explanation & Concept Rationale
Celiac disease is an autoimmune enteropathy triggered by gliadin peptides in gluten. Complete lifetime elimination of wheat, barley, rye, and triticale is required to restore intestinal villous architecture.
Q. 21
Dietetics
Difficulty: Easy
(1 Mark)
The Dietary Approaches to Stop Hypertension (DASH) diet is clinically proven to lower blood pressure primarily because it is rich in:
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Step-by-Step Explanation & Concept Rationale
The DASH diet emphasizes fruits, vegetables, low-fat dairy, whole grains, nuts, and fish, delivering high levels of potassium, magnesium, calcium, and fiber while restricting sodium (< 2300 mg/day).
Q. 22
Dietetics
Difficulty: Hard
(1 Mark)
In a hospitalized patient with acute decompensated liver cirrhosis and hepatic encephalopathy, which dietary amino acid strategy is beneficial?
💡
Step-by-Step Explanation & Concept Rationale
In hepatic failure, the plasma BCAA-to-AAA ratio declines. BCAAs (leucine, isoleucine, valine) compete with AAAs (phenylalanine, tyrosine, tryptophan) across the blood-brain barrier, reducing false neurotransmitter synthesis.
Q. 23
Dietetics
Difficulty: Medium
(1 Mark)
What is the hallmark, life-threatening biochemical abnormality observed in Refeeding Syndrome when initiating nutrition in severely malnourished patients?
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Step-by-Step Explanation & Concept Rationale
Carbohydrate reintroduction drives insulin release, triggering rapid cellular uptake of phosphate, potassium, and magnesium. Precipitous hypophosphatemia causes cardiac arrest, respiratory failure, and death.
Q. 24
Dietetics
Difficulty: Easy
(1 Mark)
For a patient with acute gouty arthritis and hyperuricemia, which foods should be strictly restricted?
💡
Step-by-Step Explanation & Concept Rationale
Purines are metabolized into uric acid. High-purine foods (organ meats, small fish, meat extracts) and alcohol/fructose (which accelerates ATP degradation to AMP) drive hyperuricemia and crystal precipitation.
Q. 25
Dietetics
Difficulty: Easy
(1 Mark)
Infants diagnosed with Phenylketonuria (PKU) require complete avoidance of which synthetic intense sweetener?
💡
Step-by-Step Explanation & Concept Rationale
Aspartame is a methyl ester of the aspartic acid/phenylalanine dipeptide. In the GI tract, it hydrolyzes to liberate free phenylalanine, which is toxic to the brain in PKU patients.
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