Dr. Mehmet Oz measures megachurch pastor Rick Warren's waisteline at a "Daniel Plan" forum at Saddleback Church in Lake Forest, Calif. Warren has already lost 60 pounds, and hopes to lose 30 more using the faith-based diet plan. RNS photo courtesy Toby Crabtree/Saddleback Church

Dr. Mehmet Oz measures megachurch pastor Rick Warren’s waisteline at a “Daniel Plan” forum at Saddleback Church in Lake Forest, Calif. Warren has already lost 60 pounds, and hopes to lose 30 more using the faith-based diet plan. RNS photo courtesy Toby Crabtree/Saddleback Church