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What it basically is, is a food and fitness tracker. To create a profile you enter your information (gender, height, weight, and activity level) and your goal (weight management, lose 1 pound a week, lose 1.5 a week, etc.) What I really like about it is that is has everything for food, and very specific. It had the exact type of whole wheat wraps I eat, and Dunkin' Donuts bagels versus just "bagel." In fact, even TruBlood is an option, if you are a TV vampire living in the Bayou. I also entered my morning run, and it tracks time, speed, and distance to calculate calories burned.
As a Weight Watchers graduate (not that I paid for it or went to meetings-shhh!), I think this is a great product, because it is a user-friendly way to track calories in and calories out. The Weight Watchers system works on this principle, but simplifies the calories into points (a point is about 50 calories, factoring for fat and fiber).
For those who are interested or need it, the site also gives specific percentages on your intake of calories from carbs, protein, and fat. For the truly obsessive or those with specific health goals, you can track sodium, cholesterol, and sugar.
I may fall in and out of keeping up with this site, but then I've done that with my weight loss efforts for 5 years, and this is another thing that I can always go back to.