From reading the article, it seems the health benefits may, primarily, be attributed to having lowered blood sugar? I've also seen a number of references saying just eating less has the ability to extend life. So, could it be that sugar, in general, is really really bad for us? If you don't have diabetes, could you get the same benefits Metformin provides simply cutting as much sugar out of your diet as possible? The article reads like a distraction for the masses from the research being done for billionaires to extend their lives. "Hey, don't feel so bad about all the billionaires working on super fancy life extending treatments you can't afford. You can take a cheap little pill to live longer too."