BP's don't easily become overweight as far as I've ever been told and have experienced in our own collection. Over feeding either in size of single prey or total prey volume can trigger a fast as these snakes will self-regulate their own weight gain. I have had one male that got a bit too chunky and wasn't a good breeder. When we adjusted his prey intake he took right off that way. I can't say though that I've ever seen a truly obese BP.

We have 23 BP's here from small 07's up to big mature 02's. Everybody gets either one or two appropriately sized prey items once per week. For me, an appropriately sized prey item doesn't exceed the biggest girth of the snake and doesn't leave a large, noticeable feeding lump. Even for our big females we only offer a small to small/medium rat once per week (occasionally two smalls) which is far smaller than their actual girth.

Hope that's of some help.