Growing up, humans are trained to think of food as a reward. Every time children do well in a class room, the teacher may reward them with a lollipop. Therefore, children conclude that they will be rewarded with food for good behavior every time. Even as children grow up to become independent adults, they are conditioned to think of food as a reward. After a long day at school or at work, some people may go through the drive-thru window of McDonald's to reward themselves for a hard day's work. This is one of the reasons why Americans are becoming increasingly fat--we reward ourselves with food! The fast food businesses realize this and offer larger proportions for a better value, therefore causing Americans to become obese and unhealthy.…