The Healbe GoBe 2 is a singularly unusual fitness band. Regardless of what other features it offers—and I'll discuss those later—the GoBe's real appeal is its promise to track details about what you've eaten, including fat, calories, carbs, and protein—automatically and completely non-invasively. Simply wear it all day, and it records what you eat. It's the Holy Grail of fitness gadgets: No more keeping food journals and tracking your fat and calories through the day. It… just does it for you.