What does it mean to have a food intolerance?

I want to know about food intolerance and what is the most common food intolerance?
Crum RonaldDigital MarketerAsked:
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See  https://en.wikipedia.org/wiki/Food_intolerance

As usual Wikipedia is your friend.

See the links at the bottom for Lactose and Gluten tolerance problems.  These are fairly common.
Scott JohnsonPhysicianCommented:
Food intolerance is basically a detrimental reaction, which happens due to the food, beverage, food additive, or the compound that happens in foods. Food intolerance means that individual elements of certain foods that cannot be properly processed and digested by our digestive system.

The foods that cause intolerance reactions are:-
1. Dairy products.
2. Chocolate.
3. Egg.
4. Food additives.
5. Wine, especially red wine.

Read everything about food intolerance: https://www.intolerancelab.co.uk/allergy-2/
it often happens when getting older - the digestive systems start to work at less than 100%, providing less of the needed products by glands, to digest properly fat, gluten ,etc...
when reaching a low border  - it causes a detectable problem
it causes you to switch to other foods, and avaid the ones causing intolerance
these can be discovered by the quint test - of which i only found articles in flemish
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