:mushroom:Mushrooms change in composition and taste when reheated, causing upset stomach and loss of health benefits.
:egg:Eggs can become toxic when reheated, especially omelets and hard-boiled eggs.
:rice:Reheated rice can contain harmful bacteria and cause vomiting and diarrhea.
:baby_bottle:Breast milk should not be reheated in the microwave as it can create hot spots and chemical hazards.
:chicken:Chicken and processed meats can change in protein compounds and develop carcinogenic nitrites when reheated.