You can eat leftover pizza the next day as long as the leftover pizza has been refrigerated.
If the pizza was left out overnight then it can be unsafe to eat due to bacteria growing on the pizza and the meats and cheeses spoiling.
Pizza is good for up to 2 hours when left out at room temperature.
After 2 hours of the pizza being out at room temperature it can begin to grow bacteria and spoil.
It's not considered safe to eat pizza that was left out longer than 2 hours or left out overnight.
Pizza left out overnight or longer than 2 hours could make you sick so you should throw it out and not eat it.
Pizza with meats on it spoil faster than pizza without meat.
Always refrigerator any leftover pizza if not eating it within 2 hours.
Then you can reheat the leftover pizza in the oven or reheat slices of pizza in the microwave or a toaster oven.
When you consume pizza that has been sitting on the counter overnight, you consume the bacteria that's been growing on it too.
This increases your chance of contracting a foodborne illness–or getting what many people commonly refer to as food poisoning.
The first sign of pizza going bad is a hard and dry texture. From there, it will develop an “odd” or rancid odor.
Mold and other bacteria will develop over time.
Common signs of bad pizza include.
Dry and Hard Texture.
“Off” Odor.
Slimy Toppings.
Mold.
Bad Taste.
Per USDA guidelines, perishable food left out over two hours should be tossed; one hour if the air temp is 90F or hotter.
Pizza left on the counter can remain safe for a few hours at most.
Food that isn't kept below 40 degrees Fahrenheit can lead to an increased chance of being a source of foodborne illness.
Eating a leftover pie that's kept overnight on your counter isn't advised.