Store safely. Change the reheating dish.
Keep leftovers safe first, then choose a dish suited to reheating. A suitable bowl or plate you already own may be enough.
What to do.
- Put leftovers away promptly.
Use shallow, food-grade containers and refrigerate within two hours—or one hour when the temperature is above 90°F (32°C). Keep the refrigerator at 40°F (4°C) or below.
Sources: FoodSafety.gov: chilling food
- Choose a dish intended for the microwave.
For a nonplastic reheating option, transfer food to intact glass or ceramic explicitly labeled microwave-safe. Do not microwave margarine or yogurt tubs, or takeout packaging without suitable-use instructions. Ordinary glass jars are not automatically heat-safe.
Sources: USDA: microwave-safe utensils · FDA: microwave ovens
- Heat the food thoroughly.
Cover appropriately, stir or rotate, and check with a food thermometer that leftovers reach 165°F (74°C) in several places. Changing the container does not replace safe reheating.
Sources: USDA: reheating leftovers
Start with a suitable plate or bowl.
Check what you already have before shopping. Use an existing microwave-safe dish, or reheat suitable foods in an appropriate saucepan on the stove. Follow the dish or pan’s instructions and the same safe leftover-temperature guidance.
Sources: USDA: microwave-safe utensils · USDA: reheating leftovers
When a replacement
might make sense.
Use another suitable food container when the current plastic container is cracked, scratched, misshapen, or no longer seals properly. You do not need to replace every serviceable container at once; keep each item within its intended use.
Sources: MSU Extension: food containers
Keep the trade-offs
in view.
- Glass can be heavier and break. A glass item is not automatically suitable for heating, freezing, or a sudden temperature change.
- Metal containers are generally unsuitable for microwave use; follow the appliance and container instructions.
- A convenient routine still needs prompt chilling, suitable cookware, and thorough reheating.
What the guidance supports
Food-storage temperatures, suitable cookware, and thorough reheating are established food-safety practices. Nonplastic reheating dishes are one precautionary material choice.
What it does not establish
These steps do not measure chemical exposure or establish that a container change will prevent disease. No material is presented as risk-free or free of every exposure.
Sources: FoodSafety.gov: chilling food · USDA: reheating leftovers · NIEHS: bisphenol A
Go straight to the sources.
Sources reviewed 28 October 2026. These are original summaries of linked guidance, not an independent scientific review. Sources and recommendations can change.