Red kidney beans: -Eating just four or five of these raw can really hurt you. Red kidney beans contain lectins.
Wild mushrooms: -While most mushrooms you will find in the supermarket are safe to eat raw, it's not advisable to eat wild mushrooms without cooking them.
Rhubarb leaves: -There's a reason why we eat the stalks and not the leaves. Rhubarb leaves contain oxalic acid, which makes then toxic, so always discard them.
Potatoes: -Stick to cooked potatoes. These starchy things contain toxic compounds called glycoalkaloids that can mess up your digestive system.