Diastasis recti I is a condition that happens during pregnancy when the combination of increasing female hormones and the pressure of the uterus weekends and stretches the abdominal muscle fascia. This condition does not happen under any other circumstance. Some plastic surgeons believe that obesity can cause diastasis recti but clinically I have not seen patients have recovered from massive weight loss have any difference in their abdominal muscle anatomy. Your picture shows a typical lean normal male torso. When men have bulging abdomence it is almost universally because they have a fat distribution that leans towards increased visceral fat compared to subcutaneous fat. Still, even if someone has a fat distribution that is heavy on the visceral side there has to be fat in order for it to create any problems in body contour. My best suggestion is that you continue staying lean , stay fit, Spend less time looking in the mirror and instead focus on life‘s pursuits. Best, Mats Hagstrom MD