Some people react poorly to certain foods. I get zits any time I eat deep fried potato (no, it's not because I'm "touching my face"). Had a coworker who would break out from chocolate. It's not a dose response thing for me because I react from even a small amount. At least it doesn't last as long as when I was a kid. But for you, just remember that cystic acne takes a long time to heal so you'll have to cut things out for longer periods. And yes acne is absolutely a hormonal thing as witnessed by puberty and menstrual cycles but there can be additive things (personally I'm not convinced that there aren't endocrine disruptors in deep fried potatoes).