For example, eating sweets leads to the release of endorphins which reduces stress. Some foods can be harmful if eaten to excess. Too much salt, as is well known, can be harmful. On the other hand, if you are lost in the Arctic and stumble across a live polar bear you probably won't have to worry where your next meal is coming from. Between 1970-1985 four people were killed and fifteen injured by polar bears in Canada.
Some people take great risks with their food.
It has been eaten for thousands of years by the Chinese. Prions hide unsuspecting in beef ready, in time, to cause human variant BSE, Creutzfeldt-Jacobs disease in the unlucky. It has been worried that Salmonella, a bacteria that can cause serious food poisoning, is prevalent in battery farmed chickens and eggs. We are continually being told that a lot of what we eat is bad for us and then the advice on this can shift. There is a movement to organic foods and then warnings about natural toxins.