Best Diet and exercise for Psoriatic Authritis

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Hey Everyone,
Maybe you guys can help me? I feel like no one can give me a straight answer on diet and exercise when you have an autoimmune disease. My doctor wants me to lose 50lb. I am down for that. Started eating better, counting calories and all that good stuff. Plus started doing T25 by beach body. Is that enough? Any suggestions would be greatly appreciated. #onamission