I Used To Be Fat premiered on MTV on December 29, 2010. College is all about reinvention. It's a time in a teen's life where they can leave behind all of the preconceived notions people had about them in high school and start fresh. Unless they're massively overweight. This series profiles teenagers desperate to shed their unwanted pounds before heading off to school. They'll send a weight loss guru to work with each person and they'll go through rigorous fitness regimens and work with experts to learn how to change the habits that caused them to gain so much weight. Some will lose the weight. Others will fail. But either way, this will be the most important summer of their lives.