Those of us over 30 lose approximately 3% to 8% of our skeletal muscle mass each decade, and more over the age of 60. That's a bit shocking, isn't it? That muscle loss can lead to frailty, type 2 diabetes, physical disability and even mortality. But the good news is we can turn that around. Researchers in the U.K. found that a simple task of eating vitamin C-rich foods, such as citrus, berries and vegetables, can turn that muscle loss around.