Although eating clean is not a perquisite for being lean or weight loss, it does make the task easier. Typically, whole foods such as fruits, vegetables, lean proteins, legumes, and nonfat dairy are low calorie high volume foods. Low calorie high volume foods allow you to eat more food which leads to you feeling fuller while consuming fewer calories. For example, four ounces of chicken breast, which is generally considered a clean food, contains roughly the same amount of calories of just two Oreos which are usually considered a bad food. Thus, eating clean or healthier foods makes eating fewer total daily calories easier in terms of satiety and fullness. Also, you are more likely to get more nutrition in terms of vitamins and minerals eating healthier foods leaving you with better overall health.