According to a new study in the Proceedings of the National Academy of Sciences, eating a Western diet may cause a rise in bad gut bacteria in children, and this may predispose these children to allergies and obesity in later life. In the study, scientists compared the gut bacteria of children in an African village with the bacteria of children in a European city. The African children consumed a diet that was largely vegetarian diet, and they were breast-fed until age two, while the European...