People that are fat have lots of problems. They don't exercise, and they eat a lot, increasing their food bills. Also, they are more likely to become sick, so that increases their healthcare costs. If people were skinny, then they could cut down on health care costs, putting less of a strain on our system and creating a better America.
The human body evolved to consume a certain nutritional mix and recieve sufficient exercise to not accumulate adipose tissue. Excessive fat, caused by poor diet and sedentary lifestyles, is linked to a multitude of health conditions. Those conditions cause a burden on society as a whole, so accumulation of fat should be discouraged.