Check your shampoo bottle label. I don't know WHY I didn't figure this out sooner!!!!
It's the shampoo I use in the shower! When I wash my hair, the shampoo runs down my whole body and (duh!) printed very clearly on the shampoo label is this warning: FOR EXTRA VOLUME AND BODY!
No wonder I have been gaining weight!!! Well, I have now gotten rid of that shampoo and I am going to start using Dawn dish soap instead. Their label reads: DISSOLVES FAT THAT IS OTHERWISE DIFFICULT TO REMOVE.
Problem Solved!!! If I don't answer the phone I'll be in the shower!!!