Maggoty Mushrooms

What it is: Maggots are fly larvae, tiny rice-shaped creatures that feast on rotting foods.

Where it is: The Food and Drug Administration legally allows 19 maggots and 74 mites in a 3.5-ounce can of mushrooms.

Why it's bad: While maggots do have their place in the medical world—they can help heal ulcers and other wounds—most people think it's pretty gross to eat them!

If you need another reason to ditch canned goods, consider this: Most are lined with bisphenol A, or BPA, a plastic chemical that causes unnatural hormonal changes linked to heart attacks, obesity, and certain cancers.

Read More: Grow Your Own Vitamin D-Rich Mushrooms