harmless.

First, microorganisms themselves are composed of protein, fat, sugar, nucleic acids and other substances, which are exactly the same as those of the human body and have no conflict with the human body. Second, although some microorganisms can produce toxic and harmful substances, because there are not many kinds of these microorganisms, they will definitely be cleaned before cooking, so the number is not much. In addition, many harmful substances can be decomposed or inactivated by heating, so they will enter the human body very little and will not cause harm to the human body. Third, there are many kinds of microorganisms in the human digestive tract, which are normal microorganisms in the body. As long as the species and quantity are within the normal range, they are completely harmless. Moreover, most of these microorganisms enter the body through food.

Of course, if the food has been contaminated by a large number of microorganisms, or if the amount of toxic and harmful substances produced by microorganisms in the food is too large to be completely removed by heating, or if the food is left for too long after being cooked and re-contaminated by microorganisms (a large number of living microorganisms are eaten), it may also cause harm, such as bacillary dysentery and botulinum toxin poisoning, but the possibility of this disease is too low.