I think they suggest weight loss because it does help some and majority of people affected by IIH are overweight women of child bearing years. It affects any age, shape, and size, but we try to encourage members to get as healthy as possible.
For me, I gained over 100lbs after diagnosis and just can't seem to get it off no matter what I do. I'm currently eating vegetarian and try to keep processed foods under 20% of my intake. I have found that processed foods cause a lot of swelling and pain for me, so best for me to avoid them when possible.
Everyone is different, so you may want to try an elimination diet and keep a journal to get an idea of what foods may affect you. A symptom log is always helpful in the beginning because IIH does affect everyone differently and it can help identify triggers. There are samples in our Useful Guides and Print Outs section.