Rice
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You should always consume freshly cooked rice as it contains bacteria that does not stop growing even after the cooking has stopped.
Egg
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Eggs should not be exposed to heat twice as it contains nitrogen. When heated, it can turn toxic.
Spinach
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On heating spinach again, the nitrogen in it can turn into nitrites and that is toxic.
Cooking Oil
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No cooking oil should be reheated as it can become rancid.
Mushrooms
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Reheating mushrooms can cause digestive problems.
Chicken
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The structure of protein changes after heating chicken and doing it frequently can cause digestive problems.
What do you think ?