Don't Eat Them: 10 Tell-Tale Signs That Your Food Has Gone Bad

2. Meats develop a shiny or slimy film.

Normally, we enjoy shiny things, but if your meat or produce has a shiny or slimy film on it, it would be better to throw it away. An opalescent sheen is an obvious sign that bacteria have already started to grow on your food, which can cause serious bellyache if consumed.