Chemo Girl -
Thanks for setting the record straight. It drove me nuts when I was going through chemo and radiation when people said, with extreme surprise, "but you look GREAT!"...well, of course I did. I, too, gained weight during chemo. And, most people look fine in the early stages of cancer. It's usually when the cancer becomes more advanced and they are having more frequent and stronger treatments that they start to look like they're sick.
Also, as chemo girl pointed out, you only lose your hair due to radiation if you have radiation treatments to the head.
Also, not all chemotherapies cause hair loss.
So, it's quite possible your friend is telling the truth.