Diet is an important part of every successful weight-loss program. What is consumed as food is a big determinant of how much excess fat one can lose in any of such plans. In general, the most effective weight loss foods are those that are natural. The best diet is the one that has a mixture of vegetables, fruits, fish, whole grains and meals that are rich in fiber. It is important to take out time to learn how these foods can be properly combined in correct proportions.