5 foods you should never keep overnight | July 20, 2025

Some foods can become unsafe to eat when kept overnight due to the growth of bacteria, chemical changes, or the loss of nutrients.

Certain items are especially sensitive and should be eaten fresh or handled with extra care. Failing to refrigerate or reheat them properly can greatly increase health risks.

For example, mushrooms and wood ear fungus should ideally be consumed the same day they’re prepared.

These foods contain complex proteins and elevated nitrate levels that can break down into harmful substances if stored too long.

Reheating them may also cause digestive discomfort or more serious health effects.

Leafy greens—especially nitrate-rich ones like spinach—also lose both nutritional value and safety when left at room temperature.

Over time, they develop higher nitrite levels and lose important nutrients, making them less healthy and potentially unsafe if not stored correctly.

Soy-based products such as tofu and soy milk are high in protein and moisture, making them prone to bacterial growth.

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