There are many signs that food should be rejected, but some of the most common ones are listed below. If you see any of these signs on your food, it's best to throw it out:
1. The food is discolored or has strange-looking patches.
2. The food has an off odor.
3. The food is moldy.
4. The food has been infested with bugs.
5. The expiration date on the food has passed.