Diet and Psoriasis

I know this is an old thread, but was wondering if anyone had continued success treating their psoriasis through diet. I have had eczema for years but these new plaques on my trunk now point to psoriasis. Before starting a biologic that can affect my immune system, I wanted to try to clean up my diet. I had been eating a lot of sugar so that might have explained the exacerbation. I'm researching elsewhere too but was hopeful a fellow MFPer had been down this path.