Babies that are fed with bottles of protein-rich foods during the first months of life, have a 30 percent higher risk in childhood and adolescence to become overweight than those breastfed children. One reason for the development of obesity, experts suggest, according to the presence aid in a high protein content of industrially produced baby milk.

Accordingly, an increased supply of milk protein leads to an increase in growth hormone (IGF 1) and a higher insulin secretion. Both factors stimulate the formation of fat cells (adipocytes), and this lead to create the children increased fat mass. Denzer pointed out that breast feeding is over a period of more than four months, a very useful primary prevention of obesity. Also, the use of bottle feeding with limited protein content that is offered for some time, could reduce the long-term risk for obesity.