I'm sure we all know that Candace Cameron had weight issues during most of her time on full house, and went through a short bout with anorexia around the time of the fourth season episode "Shape Up".
Here's some other observations I have about it:
Candace seemed the most overweight in season 1, the first part of season 4, and the first part of season 6. In early season 4 she hid it with a lot of very loose, tent shaped dresses, and in the first part of season 6 she wears a lot of loose fitting blouses.
Candace seems less overweight in season 2 than season 1. She seems even less overweight in season 3 than season 2.
Candace seems to have lost weight around the time of "Shape Up". This appears evident in "Happy New Year" and a few episodes after, but she seems to gain some of the weight back by the end of season 4.
After being quite overweight for at least the first part of season 6, she seems to have lost weight by the season 6 episode "prom night".
Candace's weight problem appears to be mostly under control in season 7. In season 8, she has no noticable weight problem as far as I can tell. A lot of her clothes in season 8 are more fitted than a lot of what she wore before.