Food intolerances, allergies, vitamin deficiencies, and certain medical conditions all can cause fatigue.

食物不耐症，过敏，维生素缺乏和某些疾病都会造成疲劳。

Now a true food allergy is different from a food intolerance.

真正的食物过敏与食物不耐受不同。

Diarrhea can result from intestinal contents moving too quickly or from food intolerances due to loss of certain enzymes.

腹泻的原因可以是肠内容物移动过快，或特定酶缺乏导致的食物不耐受。

There is often no clear distinction between an allergy and food intolerance.

【distinction】过敏和食物不耐受之间往往没有明显的区别。