Don't bother replying to the OP. I don't know why these people who know nothing feel the need to post here, but there's never any point in explaining anything to them.
Of course acne is not caused by diet. It is 'caused' by a number of genetic differences that lead to a malfunction in how skin cells are produced and exfoliated that lead to clogged pores. And some of them have nothing to do with androgens. These are the reasons we get acne while your friend that eats crap dies not. However, all of the processes that lead to acne formation are affected by what you do to yourself re diet, sleep, excersize, stress, etc. and you can control your acne with a truly healthy diet and lifestyle.
It is the same as with just about every other disease. Type II Diabetes, for example. There are genotypes/phenotypes that make you more likely to develop diabetes. But the things you do to yourself is what makes the disease develop.
Also, all genes are not set. They turn on and off with the things you do to yourself.
Source: Acne Is Not Caused By Diet