If they're starting out at a decent size I could definitely believe someone dropping 10kg after a month. However I have a hard time believing anyone would be visibly different after a single week's worth of working out. However I can sympathise, I was in that position myself and I guess I had a sort of (very mild) body dysmorphia where I felt like I looked chunky and bloated if I missed just a couple of sessions in a row. I realise now that I was being ridiculous, I was in very good shape and it was all in my head. I picked up running and gym again earlier this year and I'm making a conscious effort not to fall into that trap again
