Our taste buds wear out every seven to ten days and are regularly replaced until we become middle-aged when this process becomes less frequent. Once we take a mouthful of food it begins to be dissolved in our saliva. Our sense of smell also aids and enriches our sense of taste and people with colds often complain about a diminished sense of taste. Some foods are known to stimulate biochemical changes which may enhance or improve our moods. 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.