Q.What is food Intolerance? Enlist the foods which are commonly associated with food intolerance.

Imagine you eat a bowl of spicy curry, and an hour later your stomach feels uneasy. Your friend eats the same curry and feels perfectly fine. This is the everyday intuition behind food intolerance: your body reacts badly to a particular food, but the reaction is not an allergy. It is a digestive or metabolic problem, not an immune-system overreaction.

Food intolerance means your body has difficulty digesting or processing a specific food or ingredient. Unlike a food allergy, which can be sudden and life-threatening, intolerance usually causes discomfort that builds up over hours or even days. The symptoms are often digestive — bloating, gas, stomach cramps, diarrhoea — but can also include headaches, fatigue, or skin issues.

Why does this matter? Because many people confuse the two. If you have a food intolerance, you do not need to avoid the food completely — you may just need to eat less of it or prepare it differently. For example, many people are lactose intolerant: they lack enough of the enzyme lactase to break down milk sugar. They can often still enjoy small amounts of yoghurt or aged cheese, which have less lactose.

Common causes of food intolerance include:

• Enzyme deficiencies — like lactose intolerance (missing lactase) or gluten sensitivity (trouble digesting gluten)
• Chemical sensitivities — reactions to naturally occurring substances like caffeine, histamine in aged foods, or salicylates in fruits
• Food additives — artificial colours, preservatives, or flavour enhancers like MSG
• Psychological factors — sometimes the mere thought of a food can trigger symptoms if you associate it with past discomfort

For a commerce or humanities student, the practical takeaway is this: food intolerance is a common, non-allergic reaction to food that affects quality of life but is not an emergency. It is managed by identifying trigger foods through an elimination diet and then adjusting portions or preparation methods. It is not a disease, but a normal variation in how different bodies handle food.