Disclaimer: I am not a doctor, nurse, nutritionist, herbalist, or otherwise medically trained person.
I am an ordinary person who has suffered from adult acne since 1995 and have found no solution to my acne through conventional medicine.
Even if I take my multi-vitamin and Yasmin regularly--if I eat a lot of regular beef (as opposed to health food store type beef), I'll still start to get pimples again.
By now of course I buy the majority of the milk I drink from Safeway (which, weirdly enough, started carrying growth-hormone-free milk a long time ago...peruse this blog and you'll get an approximate date). That's the cheapest growth-hormone-less milk; it's also sold at Trader Joe's and under certain brand names such as Berkeley Farms.
Those are the three main factors. I don't eat a lot of fast food or drink a lot of soda (the former I probably went for once a week or every other week, before; the latter I used to drink constantly). A little harder to quantify those as factors but I think they are factors too.
Also, I recently ran out of my multi-vitamin and I haven't been able to get out and buy it (I know, I know, I need to start buying it online). Voila! My acne is returning.
I've concluded that it's only my multi-vitamin and my birth control pills that stand between having relatively good skin...no pimples, basically...and having noticeable adult acne.
The diet part counts too; there is definitely a connection. There are times when I don't eat very much at all, and typically my skin gets better during those times.
But of course everyone has to eat sometime. Hence, the multi-vitamin (and it does matter which one you take; they are quite different) and bc pills (likewise).
I can admit it still pisses me off how so many people are cashing in on adult acne "treatments." It's just the complete embodiment of everything I happen to loathe about the purity...the sheer amoral purity...of our capitalism. There are no alarm bells ringing online (hey, if our food is giving us acne, what else is it giving us?)...just tons and tons of sites selling overpriced treatments.