Full House - Season 4 Episode 8 : Shape Up 1995

Teaser: Jesse and Michelle have "Fiber Bears" cereal for breakfast. Main Synopsis: It's getting close to Kimmy's 14th birthday. Of course, D.J. is among the guests invited to Kimmy's birthday party, which is scheduled to take place at a local hotel's indoor swimming pool. D.J. is afraid to let her friends see her in a swimsuit, so she secretly begins a diet that could become dangerous. The first person to notice the diet's adverse effects is Stephanie, who reluctantly promises to keep her mouth shut, but while the family is at a local gym, D.J. collapses, indicating that the diet has become dangerous. Stephanie, who is afraid D.J. may hurt herself even worse by continuing the diet, can't keep her mouth shut any longer, so she tells the guys about the diet, and Danny helps D.J. realize that her looks don't matter to her friends as much as she thinks.