The Leangains Method: The Art of Getting Ripped. Researched, Practiced, Perfected.

by Martin Berkhan

An 80-kilogram (175-pound) man with 25 percent body fat has 80 x 0.25 = 20 kilograms (44 pounds) of fat mass. Theoretically, he can sustain a caloric deficit of 20 x 69 = 1,380 calories without losing muscle mass.