Christina Farr of CNBC reports that a growing number of Silicon Valley “techies” seeking to enjoy life as long as they can are taking diabetes drub metformin in a quest to stay healthy longer. Although it is fairly safe for millions of people, side effects do exist. There is a lack of clinical evidence to back the current trend. But there is some research based on long-term effect studies. They find that there may be some unintended health benefits, including a reduced cancer risk compared to the general population. A preclinical mice study show it extended some mice lives.