Page "Monica Geller" Paragraph 11

It is revealed early in the series that she had been overweight while growing up.

Monica lost the weight when she was 18 after she overheard Chandler call her " fat " at Thanksgiving.

The writers of the series often used flashbacks to show the overweight Monica ( with Courteney Cox wearing a fat suit ).

In one episode, when the group watched an old prom video and were surprised to see her weight and also saw Rachel before she had a nose job.

In another episode where the group remember past Thanksgivings, one flashback reveals why Monica lost all the weight.

She heard Chandler tell Ross he didn't want to be stuck in all night with his fat sister, prompting Monica to break down.

She lost the weight by Thanksgiving of 1988, Rachel also lost the big nose.

In almost every episode that features " Fat Monica ", the episode ends with Monica dancing in a funny manner.