I'm new to this thread (but not new to fitness/bodybuilding). Was getting ready to compete in physique when I got hit with some still-undiagnosed digestive issue. Lost 26lbs in the last three months, but was still able to pull 315x5 today at 176lbs after not touching a weight for six weeks. I can live with that. Unless you are genetically disposed to have ultra-low bodyfat (i.e. visible abs) it's not healthy to maintain such low bodyfat. While it's not good to be obese, it's also unhealthy to maintain ultra-low bodyfat (again, unless you are genetically disposed to be that lean). Even bodybuilders who are dedicated to their diets have to take time for an off-season...the point of which is not just to gain muscle, but to restore the metabolism after dieting to an extreme level.