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Caitlin Boyle, 28, Charlotte, North Carolina
This spunky vegetarian updates her site three times a day with the latest on all things fun and fitness. Her philosophy? "Small efforts add up to make a big difference."
Go-green tip: "A plant-based diet doesn't have to be all or nothing. By doing meatless Mondays or ordering vegetarian when you eat at restaurants, you can boost your veggie intake without making drastic changes."