The eating regime basically requires a bigger increase of protein intake on a daily basis while decreasing the overall calorie consumption at the expense of carbohydrates and fats (to a lesser extent). (fitnessandpower.com)
And then I discuss the need for increased protein intake in the context of losing lean mass. (marksdailyapple.com)
But there may be good news; some research has shown that higher protein intake with exercise may help maintain muscle health. (usdairy.com)