Metformin is approved in the US as a treatment for type 2 diabetes. A new study by Cardiff University, UK, involving over 180,000 people, reveals that the drug could also increase the lifespan of those individuals who are non-diabetics. According to the Centers for Disease Control and Prevention (CDC), there are around 29.1 million people in the US with diabetes, equating to 9.3% of the population. Type 2 diabetes accounts for 90-95% of diabetes cases and is usually associated with older age, obesity and physical inactivity, family history of type 2 diabetes or a personal history of gestational diabetes. Senior...