Pediatric Nutrition — MCQs

Pediatric Nutrition Indian Medical PG Practice Questions and MCQs

Question 291: What is the primary method for the prevention of neural tube defects in newborns?

A. Iron
B. Vitamin B6
C. Vitamin B12
D. Folic acid (Correct Answer)

Explanation: **Explanation:** **Why Folic Acid is Correct:** Folic acid (Vitamin B9) is essential for DNA synthesis and methylation processes. During the first 28 days of gestation—often before a woman knows she is pregnant—the neural tube closes. A deficiency in folate impairs rapid cell division and tissue remodeling, leading to failure of the neural tube to fuse. This results in defects such as **Anencephaly** or **Spina Bifida**. Supplementation significantly reduces the incidence of these defects by ensuring adequate folate levels during this critical embryological window. **Why Other Options are Incorrect:** * **Iron:** Essential for preventing maternal anemia and ensuring fetal oxygenation, but it plays no role in the structural formation of the neural tube. * **Vitamin B6 (Pyridoxine):** Primarily used in pregnancy to manage nausea and vomiting (morning sickness); it does not prevent structural CNS defects. * **Vitamin B12 (Cobalamin):** While B12 deficiency can technically impair folate metabolism (the "folate trap"), it is not the primary clinical intervention used for the prevention of NTDs. **High-Yield Clinical Pearls for NEET-PG:** * **Ideal Timing:** Supplementation must begin **pre-conceptionally** (at least 1 month before) and continue through the first trimester. * **Standard Dose:** 400 mcg (0.4 mg) daily for low-risk pregnancies. * **High-Risk Dose:** 4 mg (4000 mcg) daily for women with a previous history of a child with NTD or those on anti-epileptic drugs (e.g., Valproate). * **Screening:** Elevated **Alpha-fetoprotein (AFP)** in maternal serum or amniotic fluid is a biochemical marker for open NTDs.

Question 292: A child complains of episodes of abdominal distension, bloating, and diarrhea upon intake of milk and milk products. Which of the following can be given to that child?

A. Ice cream
B. Skimmed milk
C. Cold milk
D. Yogurt (Correct Answer)

Explanation: ### Explanation The clinical presentation of abdominal distension, bloating, and diarrhea following milk consumption is characteristic of **Lactose Intolerance**. This condition results from a deficiency of the enzyme **lactase** (brush border disaccharidase), leading to the malabsorption of lactose, which is then fermented by colonic bacteria into organic acids and gas. **Why Yogurt is the Correct Answer:** Yogurt is well-tolerated by individuals with lactose intolerance due to two primary reasons: 1. **Bacterial Lactase:** The starter cultures used in yogurt (e.g., *Lactobacillus bulgaricus* and *Streptococcus thermophilus*) produce endogenous lactase, which helps digest lactose within the intestine. 2. **Semi-solid Consistency:** The thicker consistency of yogurt slows gastric emptying, allowing the limited amount of native intestinal lactase more time to act on the remaining lactose. **Why Other Options are Incorrect:** * **Ice Cream (A):** Contains high amounts of lactose and fat, which can exacerbate osmotic diarrhea and bloating. * **Skimmed Milk (B):** Removing fat does not remove lactose. In fact, skimmed milk often has a slightly higher lactose concentration by volume than whole milk. * **Cold Milk (C):** Temperature does not alter lactose content. Cold milk may actually increase intestinal motility in some individuals, worsening symptoms. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** The **Hydrogen Breath Test** is the non-invasive gold standard. A stool acidity test (pH < 5.5) and the presence of reducing sugars are common bedside findings. * **Secondary Lactose Intolerance:** Frequently occurs post-gastroenteritis (e.g., Rotavirus) due to the sloughing of the intestinal villi tips where lactase is located. * **Management:** Encourage fermented dairy (yogurt, aged cheese) and exogenous lactase enzyme substitutes. Avoid complete dairy restriction to prevent Vitamin D and Calcium deficiency.

Question 293: One of the following is not reported to be a clinical manifestation of Zinc deficiency in children?

A. Dwarfism and hypogonadism
B. Liver and spleen enlargement
C. Impaired cell–mediated immunity
D. Macrocytic anaemia (Correct Answer)

Explanation: **Explanation:** Zinc is an essential trace element required for the function of over 300 enzymes, including those involved in DNA synthesis, cell division, and protein metabolism. **Why Macrocytic Anaemia is the Correct Answer:** Zinc deficiency is **not** associated with macrocytic anaemia. Macrocytic anaemia is typically caused by deficiencies in Vitamin B12 or Folic acid. In contrast, zinc deficiency is more closely linked to impaired growth and immune dysfunction. While severe zinc deficiency can sometimes coexist with iron deficiency (leading to microcytic anaemia) in malabsorption syndromes, it does not independently cause macrocytic changes. **Analysis of Incorrect Options:** * **Dwarfism and Hypogonadism:** These are classic features of chronic zinc deficiency, famously described in the "Prasad syndrome." Zinc is vital for the growth hormone-IGF-1 axis and gonadal development. * **Liver and Spleen Enlargement:** Hepatosplenomegaly is a documented clinical finding in children with chronic zinc deficiency, often seen alongside growth retardation and geophagia (clay eating). * **Impaired Cell-Mediated Immunity:** Zinc is crucial for T-lymphocyte function and thymic hormone activity. Deficiency leads to lymphopenia, thymic atrophy, and increased susceptibility to infections (e.g., pneumonia and diarrhea). **High-Yield Clinical Pearls for NEET-PG:** * **Acrodermatitis Enteropathica:** An autosomal recessive disorder of zinc absorption characterized by the triad of **alopecia, diarrhea, and vesiculobullous dermatitis** (periorificial and acral). * **WHO Recommendation:** Zinc supplementation (20 mg/day for 10-14 days) is standard management for pediatric **diarrhea** to reduce severity and recurrence. * **Other signs:** Hypogeusia (decreased taste), impaired wound healing, and night blindness (zinc is a cofactor for Retinol dehydrogenase).

Question 294: Craniotabes in children is commonly associated with which vitamin deficiency?

A. Vitamin D (Correct Answer)
B. Vitamin A
C. Vitamin E
D. Vitamin C

Explanation: **Explanation:** **Craniotabes** refers to the softening and thinning of the skull bones, typically the occipital and parietal bones. When pressure is applied, the bone yields with a sensation similar to pressing on a ping-pong ball. 1. **Why Vitamin D is Correct:** Craniotabes is one of the earliest clinical signs of **Nutritional Rickets** (Vitamin D deficiency). Vitamin D is essential for calcium and phosphorus absorption; its deficiency leads to defective mineralization of the osteoid matrix. In infants, this results in the softening of the skull bones. While it can be a physiological finding in newborns, its persistence or appearance after the neonatal period strongly suggests Rickets. 2. **Why Other Options are Incorrect:** * **Vitamin A:** Deficiency primarily affects the eyes (Xerophthalmia, Bitot’s spots) and epithelial integrity, not bone mineralization. * **Vitamin E:** Deficiency leads to hemolytic anemia (especially in preterms) and neurological symptoms like ataxia, but does not cause bone softening. * **Vitamin C:** Deficiency causes **Scurvy**. While Scurvy affects bones (subperiosteal hemorrhage, Scorbutic rosary), it is characterized by bone fragility and painful joints rather than the "ping-pong" softening seen in Craniotabes. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest sign of Rickets:** Craniotabes (usually appears at 3–6 months). * **Earliest radiological sign of Rickets:** Cupping and splaying of the distal ends of long bones (best seen at the wrist/lower end of radius and ulna). * **Rachitic Rosary:** Palpable enlargement of costochondral junctions (rounded/blunt), whereas **Scorbutic Rosary** is sharp and angular (due to subluxation of the sternum). * **Harrison’s Sulcus:** A horizontal groove along the lower border of the thorax corresponding to the insertion of the diaphragm, seen in chronic Rickets.

Question 295: What is the caloric supplementation required per kilogram of body weight for a severely malnourished child?

A. 100 cal/kg
B. 125 cal/kg
C. 150 cal/kg
D. 175 cal/kg (Correct Answer)

Explanation: ### Explanation The management of Severe Acute Malnutrition (SAM) is a high-yield topic for NEET-PG, focusing on the WHO protocols for stabilization and rehabilitation. **Why 175 cal/kg is correct:** The nutritional rehabilitation of a severely malnourished child is divided into two main phases: 1. **Stabilization Phase (Initial):** Focuses on treating life-threatening complications (hypoglycemia, hypothermia, infection). Caloric intake is kept low (**80–100 kcal/kg/day**) to prevent **Refeeding Syndrome**. 2. **Rehabilitation Phase (Catch-up growth):** Once the child’s appetite returns and edema subsides, the goal shifts to rapid weight gain. During this phase, the caloric requirement increases significantly to **150–220 kcal/kg/day**, with **175 kcal/kg/day** being the standard recommended target to achieve catch-up growth. **Analysis of Incorrect Options:** * **A (100 cal/kg):** This is the caloric limit for the **Stabilization Phase** (F-75 diet). Exceeding this early on can lead to metabolic collapse. * **B (125 cal/kg):** This is an intermediate value and is insufficient for the rapid catch-up growth required in the rehabilitation phase of SAM. * **C (150 cal/kg):** While 150 kcal/kg is the lower limit of the rehabilitation range, 175 kcal/kg is the more specific, classically tested "target" value in standard pediatric textbooks (like Ghai Pediatrics). **Clinical Pearls for NEET-PG:** * **Protein Requirement:** In the rehabilitation phase, protein intake should be **4–6 g/kg/day**. * **F-75 vs. F-100:** F-75 (75 kcal/100ml) is used in the stabilization phase, while F-100 (100 kcal/100ml) is used in the rehabilitation phase. * **Target Weight Gain:** Good progress in the rehabilitation phase is defined as a weight gain of **>10 g/kg/day**.

Question 296: What is true about breastfeeding?

A. It is best for both preterm and term infants. (Correct Answer)
B. About 50% of the energy is derived from protein.
C. It should be avoided for a day after a caesarean section.
D. It predisposes to necrotising enterocolitis.

Explanation: **Explanation:** **Why Option A is correct:** Breast milk is the gold standard for infant nutrition. For **term infants**, it provides the ideal balance of nutrients and immunological factors. For **preterm infants**, it is even more critical as it is easier to digest, promotes gut maturation, and significantly reduces the risk of sepsis and Necrotizing Enterocolitis (NEC). While preterm infants may eventually require "Human Milk Fortifiers" to meet higher caloric and mineral needs, breast milk remains the preferred base. **Why the other options are incorrect:** * **Option B:** In breast milk, approximately **50% of the energy is derived from fats**, not protein. Protein accounts for only about 7% of the total calories, which is ideal as it prevents an excessive renal solute load on the immature infant kidneys. * **Option C:** Breastfeeding should be initiated as soon as possible. After a **Caesarean section**, it should ideally start within **4 hours** (or as soon as the mother is conscious), whereas after a vaginal delivery, it should start within **1 hour**. There is no medical indication to wait 24 hours. * **Option D:** Breast milk is actually **protective** against Necrotizing Enterocolitis (NEC). It contains IgA, lactoferrin, and probiotics that maintain gut integrity. NEC is primarily a disease of preterm infants fed with bovine-based formulas. **High-Yield NEET-PG Pearls:** * **Caloric Value:** Breast milk provides **67 kcal/100 ml**. * **Protein Composition:** The whey-to-casein ratio in early breast milk is **80:20**, making it highly digestible (compared to 20:80 in cow’s milk). * **Colostrum:** Rich in **IgA** and growth factors; acts as the infant's "first immunization." * **Contraindications:** Absolute contraindications include maternal **HIV** (in developed settings), **HTLV-1**, and infant **Galactosemia**. In India, HIV-positive mothers are advised to breastfeed if replacement feeding is not AFASS (Affordable, Feasible, Acceptable, Sustainable, and Safe).

Question 297: What is the recommended dose of zinc for a 9-month-old infant experiencing acute diarrhea?

A. 5 mg daily
B. 10 mg daily
C. 20 mg daily (Correct Answer)
D. 25 mg daily

Explanation: **Explanation:** The management of acute diarrhea in children involves Oral Rehydration Therapy (ORT) and **Zinc supplementation**. Zinc is crucial as it reduces the duration and severity of the diarrheal episode and prevents subsequent episodes for the following 2–3 months by improving intestinal mucosal integrity and local immunity. **Why Option C is Correct:** According to the **WHO and UNICEF guidelines** (also followed by the Integrated Management of Neonatal and Childhood Illness - IMNCI), the dosage of elemental zinc is age-dependent: * **Infants < 6 months:** 10 mg elemental zinc once daily for 14 days. * **Children ≥ 6 months:** **20 mg elemental zinc** once daily for 14 days. Since the infant in the question is 9 months old, the correct dose is 20 mg. **Analysis of Incorrect Options:** * **Option A (5 mg):** This is sub-therapeutic and is not a standard recommendation for any pediatric age group in acute diarrhea. * **Option B (10 mg):** This is the correct dose for infants **younger than 6 months**. * **Option D (25 mg):** This exceeds the standard recommended dose for pediatric diarrheal management. **High-Yield Clinical Pearls for NEET-PG:** * **Duration:** Zinc must be continued for **14 days**, even if the diarrhea stops earlier, to replenish body stores. * **Mechanism:** Zinc acts as an immunomodulator and a cofactor for over 300 enzymes; it specifically inhibits the cAMP-induced chloride secretion in the gut. * **Formulations:** Usually administered as Zinc Sulfate, Gluconate, or Acetate. * **ORS + Zinc:** This combination is considered the "Gold Standard" for reducing under-5 mortality due to diarrheal diseases.

Question 298: The protective effects of breast milk are known to be associated with which of the following?

A. IgM antibodies
B. Lysozyme
C. Mast cells
D. IgA antibodies (Correct Answer)

Explanation: **Explanation:** The protective effect of breast milk is primarily attributed to **Secretory IgA (sIgA)**. This is the most abundant immunoglobulin in human milk, especially in colostrum. **Why IgA is the Correct Answer:** Secretory IgA acts as the first line of defense for the infant’s gastrointestinal tract. Unlike other antibodies, sIgA is resistant to proteolytic enzymes in the gut. It works through "immune exclusion"—binding to viruses and bacteria (like *E. coli*, *Vibrio cholerae*, and Rotavirus) to prevent them from adhering to the intestinal mucosa, thereby preventing systemic entry. **Analysis of Incorrect Options:** * **IgM antibodies:** While present in trace amounts, IgM is not the predominant protective factor. It does not possess the secretory component that allows sIgA to survive the acidic environment of the infant's stomach. * **Lysozyme:** This is an enzyme found in breast milk that kills bacteria by disrupting their cell walls. While it is a protective factor, it is considered a non-specific innate component and is less clinically significant than the targeted protection provided by IgA. * **Mast cells:** Breast milk contains live leukocytes (primarily macrophages and neutrophils), but mast cells are not a significant or characteristic component of the protective cellular profile of human milk. **High-Yield Clinical Pearls for NEET-PG:** * **Bifidus Factor:** A nitrogen-containing sugar in breast milk that promotes the growth of *Lactobacillus bifidus*, which maintains an acidic gut pH to inhibit pathogens. * **Lactoferrin:** An iron-binding protein that inhibits the growth of iron-dependent bacteria like *E. coli*. * **Colostrum:** Rich in IgA, fat-soluble vitamins (A, D, E, K), and minerals, but lower in fat and lactose compared to mature milk. * **Enteromammary Pathway:** The process by which the mother’s gut-associated lymphoid tissue (GALT) produces antibodies against pathogens in her environment, which are then secreted into her milk to protect the infant.

Question 299: All of the following statements regarding a child with hypernatremic dehydration are true EXCEPT?

A. There is at least a 10 percent fluid deficit
B. Rapid rehydration is indicated (Correct Answer)
C. Muscle tone is increased
D. The sensorium fluctuates between lethargy and hyperirritability

Explanation: ### Explanation Hypernatremic dehydration (Serum $Na^+ > 150$ mEq/L) is a critical pediatric emergency that requires a cautious approach to fluid management. **Why Option B is the Correct Answer (The "Except" Statement):** Rapid rehydration is **contraindicated** in hypernatremic dehydration. In a hypernatremic state, the brain produces "idiogenic osmoles" to maintain intracellular volume and prevent shrinkage. If fluids are replaced too rapidly, the serum osmolality drops quickly, causing water to rush into the brain cells (where osmolality is still high). This leads to **cerebral edema**, seizures, and permanent neurological damage. The goal is a slow reduction of serum sodium at a rate not exceeding **0.5 mEq/L per hour** (or 10–12 mEq/L per day) over 48–72 hours. **Analysis of Other Options:** * **Option A:** Hypernatremic dehydration often presents with subtle clinical signs because water is pulled from the intracellular space to the extracellular space, maintaining blood pressure and skin turgor longer than in other types. By the time clinical signs of dehydration are obvious, the deficit is usually **at least 10%**. * **Option C:** Hypernatremia causes neuromuscular irritability, which characteristically manifests as **increased muscle tone** (hypertonia) and brisk deep tendon reflexes. * **Option D:** The classic neurological presentation is a **fluctuating sensorium**. The child may appear lethargic or somnolent but becomes hyperirritable and emits a high-pitched cry upon even minor stimulation. **Clinical Pearls for NEET-PG:** * **Skin Texture:** The skin in hypernatremic dehydration often feels **"doughy" or velvety** rather than showing a typical loss of turgor. * **Complication of Rapid Correction:** Cerebral edema and herniation. * **Complication of Hypernatremia itself:** Intracranial hemorrhage (due to shrinking of the brain and tearing of bridging veins). * **Fluid of Choice:** Isotonic saline (0.9% NS) is used for initial shock management, followed by a slow infusion of 0.45% saline for deficit correction.

Question 300: Painful pseudoparalysis in an infant is suggestive of which vitamin deficiency?

A. Vitamin A deficiency
B. Vitamin B6 deficiency
C. Vitamin E deficiency
D. Vitamin C deficiency (Correct Answer)

Explanation: **Explanation:** **Vitamin C deficiency (Scurvy)** is the correct answer. In infants, scurvy typically manifests between 6 and 24 months of age. The hallmark of infantile scurvy is **subperiosteal hemorrhage**, most commonly involving the femur and tibia. These hemorrhages are exquisitely painful, leading the infant to keep their limbs still to avoid pain—a clinical state known as **pseudoparalysis**. The infant often assumes a "frog-leg position" (flexed and abducted hips/knees) and may cry intensely when handled or changed. **Why other options are incorrect:** * **Vitamin A deficiency:** Primarily presents with ocular signs (Bitot spots, xerophthalmia, night blindness) and follicular hyperkeratosis, not bone pain or pseudoparalysis. * **Vitamin B6 (Pyridoxine) deficiency:** In infants, this typically presents with intractable seizures (pyridoxine-dependent epilepsy), irritability, and cheilosis. * **Vitamin E deficiency:** Leads to hemolytic anemia (especially in preterms) and neurological symptoms like ataxia and loss of deep tendon reflexes, but not painful bone lesions. **NEET-PG High-Yield Pearls for Scurvy:** * **Clinical Signs:** "Frog-leg" position, Scorbutic rosary (sharp angulation at costochondral junctions), and gingival hemorrhages (only if teeth have erupted). * **Radiological Signs:** * **Frankel’s Line:** Dense zone of provisional calcification. * **Wimberger’s Ring Sign:** Sclerotic ring around a lucent epiphysis. * **Trummerfeld Zone:** Lucent "scurvy line" proximal to the dense zone. * **Pelkan Spur:** Lateral bony outgrowths. * **Differential Diagnosis:** Must be distinguished from **Rickets** (painless swelling) and **Osteomyelitis** (fever and localized inflammation).

Practice by Chapter

Breastfeeding

Practice Questions

Infant Formula Feeding

Practice Questions

Complementary Feeding

Practice Questions

Nutritional Requirements by Age

Practice Questions

Malnutrition and Failure to Thrive

Practice Questions

Obesity in Children

Practice Questions

Vitamin Deficiencies

Practice Questions

Mineral Deficiencies

Practice Questions

Food Allergies and Intolerances

Practice Questions

Nutritional Management of Chronic Diseases

Practice Questions

Eating Disorders

Practice Questions

Parenteral and Enteral Nutrition

Practice Questions

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