Caloric Restriction - the only proven way to extend lifespan

The best and most researched way to extend life spans is caloric restriction which means reducing calorie intake while maintaining good nutrition. It has been demonstrated through research on laboratory animals that caloric restriction can increase life span by as much as 60%. Since these animals are relatively simple ones, it is not been proven that this technique extends the lifespan of humans, but preliminary evidence is promising. Low calorie diets reduce insulin levels and lower body temperatures which are markers for longevity.
The lasted theory about how calorie restriction works is a hypothesis by David Sinclair, Phd. who suggests that it is "an active, highly conserved stress response that evolved early in history to increase an organism's chance of surviving adversity."