Hello there.
This is exactly what I did. Eat more fresh vegetables and fruits. No dairy products and limit red meat. Cut junk food and rarely eat fast food. Cooked meal is also mostly steamed or boiled instead of frying or BBQ/grill. I also drink more water and drink Green Tea/White Tea 5-6 cups a day. My acne has improved A LOT and skin complexion also much improved.
I wash face twice a day (morning and before bed) no medicated soap just water from shower or sometimes netrogena (sp?) bar. I also exercise at least 1 hour per day rotating between weights and cardio. I know this is a myth but I also masturbate less and when I do limit to only once a day. One time I went 4 days without masturbation and result is one week with no new acne. Myth or not it seems for me at least masturbation might be a trigger.
Anyways, I don't think eating right, exercise, less masturbation is a CURE to acne because I can still get 1 or 2 here and there even when doing all this but I think by doing these things you can lessen the chance to AGGRAVATE one's acne by removing certain triggers.