How long can leftover food be stored in the refrigerator before it becomes unsafe to eat?

Generally speaking, the safe storage time for leftover food in the refrigerator should be determined according to the type of dish. Leafy vegetables are recommended to be consumed within 24 hours, while meat and soybean products can be stored for 1-2 days. Food stored beyond these time frames is not recommended for consumption. Detailed explanation is as follows:

Leafy vegetables have high water content and relatively high nitrate levels. Even when refrigerated, bacteria may slowly multiply and convert nitrates into nitrites. The longer the storage time, the higher the risk. It is recommended to consume leafy vegetables within 24 hours after cooking, and consumption beyond this time is not advised. Meat and soybean products are rich in protein, and refrigeration can inhibit bacterial growth, allowing them to be stored for 1-2 days. If stored longer than 2 days, bacteria may proliferate significantly. Even with thorough heating, harmful substances produced by some bacteria may remain, potentially causing discomfort such as bloating and diarrhea after consumption.

In daily life, it is recommended to place leftovers into the refrigerator within 2 hours after cooking. It's best to cook according to demand and minimize leftovers. Before consuming leftovers, check carefully for signs of spoilage such as unpleasant odor, sliminess, or color changes. Only heat thoroughly and consume those with no abnormalities, prioritizing leftovers stored for shorter periods to ensure food safety.