Question

Prashant began vomiting after lunch at school. He was promptly taken to a nearby doctor, who diagnosed him with food intolerance. Outline three types of food intolerance.

Hint:

Symptoms of intolerance (like vomiting) usually appear several hours after eating, whereas allergic reactions are often immediate and life-threatening.

Answer 1

Step 1: Understanding the Concept:
Food intolerance is a digestive system response where the body cannot properly break down a certain food. It is different from an allergy, which involves the immune system.
Step 2: Detailed Explanation:

1. Lactose Intolerance: The most common type, caused by a deficiency of the enzyme 'lactase', making it difficult to digest the sugar (lactose) found in milk and dairy.
2. Fructose Intolerance: Difficulty in digesting fructose, a sugar found in fruits, some vegetables, and honey.
3. Gluten Intolerance (Non-celiac): Sensitivity to gluten, a protein found in wheat, barley, and rye, leading to bloating and abdominal pain (distinct from Celiac disease).
Step 3: Final Answer:
The three types are Lactose, Fructose, and Gluten intolerance.

Answer 2

Food intolerance happens when the digestive system cannot properly process a specific substance in food, unlike a food allergy, which involves the immune system. Grouping the common types by their underlying cause, rather than just naming them, helps explain what might have affected Prashant after his school lunch.

Enzyme deficiency type, Lactose intolerance: The small intestine normally produces an enzyme called lactase to break down lactose, the sugar found in milk and dairy products. When there isn't enough lactase, undigested lactose ferments in the gut, causing bloating, cramps and sometimes vomiting shortly after consuming dairy.
Malabsorption type, Fructose intolerance: This occurs when the intestine has difficulty absorbing fructose, a sugar naturally present in many fruits, some vegetables, and honey. Excess unabsorbed fructose draws water into the gut and ferments, leading to nausea, bloating and stomach discomfort.
Protein sensitivity type, Gluten intolerance, non-coeliac: Here the body reacts to gluten, a protein in wheat, barley and rye, without the autoimmune response seen in coeliac disease. Symptoms typically include bloating, abdominal pain and general digestive discomfort after eating gluten-containing foods.

Whichever of these three mechanisms is behind Prashant's reaction, enzyme shortage, malabsorption, or protein sensitivity, all three point to the digestive system struggling with a specific component of the meal rather than an immune attack, which is the defining feature of a food intolerance.