Very rarely are breeding BPs (especially females) fat. Females need all the body weight they can get to lay eggs. Males are more at risk but fully grown males are more likely to just get put on a reduced feeding schedule to prevent getting overweight. A lot of breeders will offer their females whatever they want to get them back up to weight after laying eggs and through the breeding season while they'll take them. If you're making your living off of making sure you're getting eggs and hatchlings to sell you want to make sure your females are big enough to produce healthy eggs.