Foods you should never reheat and why

Spring rolls
 there are also taste-related reasons for not doing so. A spring roll's multiple layers make it very difficult to recreate its crunchy texture once it’s been cooked and allowed to cool.

Plain rice
The longer cooked rice is left sitting at room temperature, the higher the chance that these spores  will develop into bacteria and multiply.

A creamy risotto can quickly go sour in the fridge.

Eggs may contain bacteria, called Salmonella enteritidis, which can cause food poisoning.

Cooked potatoes that sit at room temperature after cooking should not be reheated.

Clams, mussels, oysters
Shellfish, such as clams, mussels, oysters and scallops, is a potentially hazardous food and can carry bacteria that cause food poisoning.

 As for chicken cooked in other ways, be aware that chicken is a potentially hazardous food that can contain Salmonella.

Mushrooms are delicate and, if not cooked and stored properly, can deteriorate and cause an upset stomach.

Beets are rich in nitrates, which break down into nitrites if overprocessed through reheating.

Breast milk should never be reheated in a microwave. Not only can reheated breast milk become less nutritious, it may also pose a risk to infants.

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