1. Diet: All participants will initially be given diet information on ADA diet for the "Run In" period , including printed ADA diet instructions and advice on caloric intake. The ADA diet includes foods that are excluded in the Paleo Diet, such as grains, legumes and dairy products and will also contain less potassium. All participants will be instructed not to add salt to their food when cooking or eating. At 2 weeks, participants will be randomized to Paleo Diet arm or ADA diet arm. Participants on the Paleo Diet arm will require a "ramp-up" phase for one week (start out with 1 Paleo meal per day, then two, and then all meals will be on a Paleolithic-type menu, which contains approximately an average of 142 grams of protein and 12,200 mg of potassium per 3000 kcal. Participants on the ADA diet arm will continue on the run-in diet.