Antibiotics kill the bacteria we do want, as well as those we don't. These long-term changes to the beneficial bacteria within people's bodies may even increase our susceptibility to infections and disease.Overuse of antibiotics could be fuelling the dramatic increase in conditions such as obesity, type 1 diabetes, inflammatory bowel disease, allergies and asthma, which have more than doubled in many populations.
Antibiotics are miraculous. They've changed health and medicine over the last 70 years. But when doctors prescribe antibiotics, it is based on the belief that there are no long-term effects. We've seen evidence that suggests antibiotics may permanently change the beneficial bacteria that we're carrying. [Emphasis my own.]