This was really amazing when I discovered this diet - at first when I started it and then saw results so quickly I just went all out and was completely strict. All my large spots just 'deflated' on their own and except for slight redness they pretty much disappeared in a day or two. Whiteheads just deflated and fell off in a few days. Crucially no new spots came at ALL! People noticed a lot - my mum even & some friends. I still have the scars - although they heal way quicker - it doesn't help that much with this but they lose their 'bumpiness'
I used the 'paleolithic' diet (search it) which means nothing humans wouldn't have eaten a few thousand years ago. The high-sugar levels in your blood from eating carbs like bread, cereals, chocolate etc which are broken down into glucose extremely quickly cause oil productiom & stop the skin 'shedding'.
Humans did not suffer from acne before! It is a modern 'disease', least in terms of the last few hundred years.
I made some mistakes at first that can trick you out - eg eating potatoes & similar 'starchy' vegetables which are some of the worst glycemic indexes of all foods.
And DRIED fruit - pretty bad too.
Replaced with lots of nuts and loads of fruit. I think I may be slightly allergic though so don't have many nuts anymore
Basically a godsend!
For science behind it & foods to eat / not eat read lorain cordain's The Acne Diet. Not essential though