Yes, this tuber-iffic mealtime staple should never be eaten raw! “Eating potatoes raw can cause bloating and undesirable gastrointestinal effects, because potatoes contain starches that are resistant to being digested,” says Dr. Lisa Davis, the chief nutrition officer at Terra’s Kitchen. (Cooking the potatoes successfully breaks down these starches.) Even scarier, if raw potatoes spend a long time in a warm or damp area, they can turn green and develop a toxin called solanine. If a potato appears to have green spots on it, you should avoid eating it altogether, because the solanine could cause food poisoning.