Fat is a contagious disease

Burt Prelutsky describes a study

conducted by Dr. Nicholas A. Christakis of Harvard Medical School and James H. Fowler of UC San Diego which suggested that obesity often spreads through a social network, a pattern of contagion usually associated with such diseases as influenza and AIDS.

Instead of transmitting germs, though, these folks infected each other with their perceptions of weight. For example, a man attending a family reunion notices that his brother has gained weight since last Christmas and concludes that it’s okay to be heavy.

It's clear. Fatness, like smoking, is a social evil. All thin people that know fat ones are prone to secondary fatness. The government has no choice. All fat people, unless they've got no friends, should be banned from public places.