Canadian researchers tracked the weight gain of 757 3-to 4-month-old babies for three years. The results showed that children who were already overweight or even obese at the age of 3 had different intestinal flora from those of normal weight. After a further study of the living environment of the babies tested, the researchers found that the babies who grew up in the families with the highest use of disinfectants contained twice as many helicobacteria in their intestines as the average. Spirillaceae bacteria feed on undigested carbohydrate fiber in the human body, which is broken down to provide the body with extra calories. The increase of this kind of bacteria causes the child to produce too much heat in the body and begin to gain weight at an early age.
The main content of the text is that it is necessary to control calorie intake in infants and young children.