![]() ![]() ![]() These diets can stimulate muscle growth and put the body into ketosis, a metabolic state that uses amino acids for fuel, helping burn fat. High-protein diets are popular and can be effective for some purposes. This is a good thing: It is likely why eating fewer calories, without being malnourished, is so good for you and your longevity. In our bodies there are two important aging defense pathways––mTOR and the sirtuins––which sense when we are not eating enough amino acids or energy sources, and go to work putting our bodies in a state of defense. Ross Grant and colleagues at the University of New South Wales in Sydney––a mecca for the barbecued steak and kangaroo burger–– have published in this issue of PLoS that people who eat a lot of protein have lower NAD levels, which means that those "healthy" high protein diets might not be so healthy after all. ![]()
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