When you were first started on PD they would have given you a PFT or Peritoneal Function Test. This determines whether you are a high , medium, or low transporter so they would know how long you could dwell before you began absorbing the fluid. You should have received a copy of that test to keep in your records, if not, request one. It is my understanding that if they have your 'prescription' figured properly, you should not absorb those calories. I have found that it is difficult to lose weight while on PD, but not impossible. Be diligent in your eating habits as well as exercising and you should be able to drop some weight, just don't do it too quickly. Best 'o' luck,
Anja