Scientists found that one of the main reasons for the rapid increase of diabetes in children under the age of 5 is that they are not exposed to bacteria and germs in childhood. Those who live in rural areas have more opportunities to get along with pets because of the earlier exposure to the substances carrying bacteria, and the risk of allergies, asthma, eczema and other diseases is very low. An environment in which bacteria are eliminated too thoroughly may harm children's health.
Many harmful bacteria are in peace with the human body at ordinary times and when the human body's immunity declines, the bacteria begin to invade the human body can best support the above conclusion.