I didn't realize it til about a year ago, but I"ve fought acne my adult life. Went to an allergist last year that told me I had metabolic syndrome, which is just 4 or 5 markers that predispose me to diabetes and cardiovascular disease later in life. I eat healthy, am not overweight, exercise regularly, etc, but proinsulin levels were still too high and inflammation was high and a few other things. Plus he said my skin and build clued him in to running the tests...acne, dark splotches, and a few other thigns I don't recall.
I started eating according to diabetic guidelines and i'll be danged if the acne didn't go away, too.
Just food for thought. Cause I didn't know it.