Potatoes - Stick to cooked potatoes. These starchy things contain toxic compounds called glycoalkaloids that can mess up your digestive system.
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Lima beans - These legumes contain a compound called linamarin, which turns into cyanide. Fortunately, cooking lima beans makes them safe to eat.
Eggplant - Like potatoes, eggplant also contains solanine, which is a glycoalkaloid poison. For this reason, you shouldn't eat it raw.
Cassava - Similar to lima beans, raw cassava also contains unsafe levels of cyanide.
Milk - Raw milk is not the safest thing you can drink, as it can contain numerous germs. Pasteurized milk is a much safer option.
Brussels sprouts - Cooking Brussel sprouts not only greatly reduces their bitterness, but it also releases anti-cancer compounds called isothiocyanates.
Broccoli - While is not poisonous as such, your digestive system will be able to process broccoli much better when it's cooked.
Asparagus - While asparagus may be eaten raw, chewing through the stalks might not be an easy task.
Spinach - Spinach is often added to salads, and while it's safe to eat raw, cooking it will allow for a better absorption of iron and calcium.
Olives - Olives are mostly eaten raw, but not straight from the tree. These need to be slightly cured so that they will lose some of the bitterness.