...So, what do we need to do to enhance the length and quality of our lives even more? Researchers worldwide are pursuing various ideas, but for Mattison and colleagues, the answer is a simple change in diet. They believe that the key to a better old age may be to reduce the amount of food on our plates, via an approach called “calorie restriction”. This diet goes further than cutting back on fatty foods from time-to-time; it’s about making gradual and careful reductions in portion size permanently. Since the early 1930s, a 30% reduction in the amount of food consumed per day has been linked to longer, more active lives in worms, flies, rats, mice, and monkeys. Across the animal kingdom, in other words, calorie restriction has proven the best remedy for the ravages of life. And it’s possible that humans have just as much to gain.