I don't know WHY I didn't figure this out sooner!
I use shampoo in the shower!
When I wash my hair, the shampoo runs down my whole body, and 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 gotten rid of that shampoo and I am going to start showering with Dawn dish soap instead.
Its label reads, "DISSOLVES FAT THAT IS OTHERWISE DIFFICULT TO REMOVE."
If I don't answer the phone, I'll be in the shower!