What happens if I eat a bad potato? 

First of all, you’ll know when a potato goes bad. Fewer things emit a more awful aroma than a bad potato. It’s nature’s way of saying, “Don’t eat me!” If for some crazy reason a person consumes such a gastronomical aberration, it will certainly cause you to become sick. That’s our body’s natural defense of rejecting spoiled or inedible food. But again, why would anyone even attempt this?