If you have ever started a diet with plenty of motivation and quit two weeks later because you were constantly hungry, you are not alone. Most people blame willpower, but the real problem is often the food itself. Meals that are low in fiber digest quickly, spike your blood sugar, and leave you looking for a snack an hour later. Fiber is one of the simplest tools for changing that. Before you overhaul your whole menu, though, you need to know how much you actually need. A goo