Leftovers are a great way to save money, cut down on food waste, and make busy weeknights a little easier. Most of us have no problem putting yesterday’s dinner in the microwave and calling it lunch. In many cases, that’s perfectly fine. Still, some foods need a little more care after they’ve been cooked.
The biggest concern usually isn’t the reheating itself. It’s how the food was stored beforehand. If leftovers sit out too long before going into the refrigerator, harmful bacteria can multiply. Some foods also lose their texture or flavor after being heated a second time, making them far less enjoyable to eat.
Knowing which leftovers need extra attention can help you avoid foodborne illness and make better use of what’s in your refrigerator. Here are 10 foods that deserve a little caution before you heat them up again.
Seafood
Seafood is one of the most perishable foods you can keep in the refrigerator. Fish and shellfish should be refrigerated within two hours of cooking, and even sooner if they’re sitting in a hot environment.
If you’re reheating seafood, make sure it has been stored properly and heat it until it’s steaming throughout. If you’d rather skip reheating, leftover seafood often works well chilled in salads, wraps, or sandwiches.
Spinach
Spinach contains natural nitrates that can change after repeated reheating. While the health risk for most people is considered low, spinach usually tastes and feels better when it’s only heated once.
If you have leftovers, try adding the spinach to a salad, grain bowl, or sandwich instead of warming it again.
Potatoes
Cooked potatoes should never be left sitting at room temperature for long periods. They can become a breeding ground for bacteria that produce toxins, and those toxins aren’t always destroyed during reheating.
Once potatoes have cooled slightly, move them to the refrigerator and reheat only the portion you plan to eat.
Rice
Rice surprises a lot of people because it’s one of the foods most often linked to food poisoning. The problem starts if cooked rice sits out too long after cooking, allowing bacterial spores to multiply.
Reheating won’t always destroy the toxins those bacteria leave behind, so refrigerate cooked rice as soon as possible and heat it thoroughly before serving.
Pizza
Pizza usually reheats well, but only if it was stored correctly. Cheese, meat, and vegetable toppings can all spoil if slices are left on the counter for too long.
Store leftover pizza in the refrigerator within a couple of hours, then reheat it in the oven, toaster oven, or a skillet for the best texture.
Mushrooms
Cooked mushrooms don’t always hold up well after being reheated several times. Their texture changes quickly, and improper storage can allow bacteria to grow.
If you have leftover mushrooms, refrigerate them soon after cooking and only reheat them once. They’re also great served cold in salads or pasta dishes.
Pasta
Plain pasta is usually fine to reheat. The bigger concern is often the sauce. Creamy sauces, meat sauces, and seafood sauces can spoil if they aren’t refrigerated soon after cooking.
Store pasta leftovers in airtight containers and heat them until they’re hot all the way through before eating.
Eggs
Scrambled eggs, omelets, quiches, and other egg dishes can become rubbery after reheating, and some people find they’re harder to digest the second time around.
If the eggs have been refrigerated properly, they’re generally safe to reheat once. Many people also enjoy leftover eggs cold in sandwiches, wraps, or salads.
Fried Foods and Cooking Oils
Fried foods don’t always reheat well because the oils used during cooking continue to break down each time they’re heated. That can leave food tasting stale or greasy.
If you’re reheating fried leftovers, use the oven or an air fryer instead of the microwave to help restore some of the crispness without overheating the oil.
Chicken
Chicken is one of the most common leftovers, but it also needs careful handling. If cooked chicken sits out too long before being refrigerated, bacteria like Salmonella can multiply quickly.
Store leftover chicken within two hours of cooking and reheat it until it’s hot all the way through. If you’re unsure how long it’s been sitting out, it’s safer to throw it away than take the risk.
