The trillions of bacteria in your digestive system play a major role in your metabolism, and they're linked to your risks of type 2 diabetes, obesity and the related conditions that make up "metabolic syndrome," which has become a global health epidemic. Humans and animal models with diabetes and obesity have different gut bacteria than those who don't, and when scientists transfer microbiota from obese humans or animals to germ-free animals, the recipients are more likely to become obese or diabetic. 

Continued at MedicalNewsToday