Links between diet and psoriasis/rosacia?!

Links between diet and psoriasis/rosacia?

Now I am sure there is an answer to this somewhere, as I am sure I saw a program on tv that answered this very question but being the fool I am, I didnt pay attention.

I have been a longtime sufferer of both rosacia and psoriasis. Recently (the last few days), I developed a stomach bug and so havent been eating or smoking and I noticed in just these few days, my skin condition (for both rosacia and psoriasis) has improved considerably, so my question is this?

What are the links between diet and both rosacia/psoriasis, if any, and does anyone have any good website links they can share with me on the subject?

I know the obvious things about spicy foods, alcohol etc being bad for rosacia but I know theres more to it than that.

Cutting out dairy products from your diet can help your skin a lot.