Yes, it is generally safe to keep leftovers in the fridge overnight if they were originally kept in the fridge before cooking. Here are some important points to consider:
Prompt Refrigeration: After cooking, it is essential to refrigerate the leftovers promptly, ideally within two hours of cooking. Bacteria can grow rapidly at room temperature, and leaving food out for too long increases the risk of foodborne illness.
Store in Airtight Containers: Transfer the leftovers into clean, airtight containers before refrigerating them. This helps maintain the quality of the food and prevents it from absorbing odors from other items in the fridge.
Refrigerator Temperature: Ensure that your fridge is set to a safe temperature, ideally below 40°F (4°C). A properly functioning refrigerator helps slow down bacterial growth and keeps your food fresh for longer.
Consume Within Timeframes: While it is safe to keep leftovers in the fridge overnight, it is essential to consume them within a reasonable timeframe. Generally, leftovers should be consumed within 3-4 days to ensure their safety and quality. If you don't plan to eat them within this timeframe, you can consider freezing the leftovers to extend their shelf life.
Reheating: When reheating leftovers, make sure they reach an internal temperature of 165°F (74°C) to kill any potential bacteria that might have grown during refrigeration.
Remember, these guidelines apply to general food safety practices. If you have specific concerns about a particular type of food or dish, or if you suspect the food might have been mishandled before refrigeration, it's always best to err on the side of caution and discard it to avoid any potential health risks.