Businesses have to make a profit, so no commercial system is going to help you lose weight for free. That doesn't mean you can't use the information from commercial systems to help you, though. Weight Watchers, for instances, has a point system that can be applied to any food you eat, not just their prepackaged meals. Just get a points guide on the internet and calculate the number of points the food you're eating has in it, and you're good to go.