Ah now I understand. I used to be really thin as well years ago. Long time now and I used to be told the same thing and even if I was brought into hospital the nursing staff thought I was anorxic and were nearly pushing the food down my throat and used to actually sit on the bed looking at me while I was eating as well.
I was a big eater and never mattered what I eat just never put the weight on and then all of a sudden years later I put on a stone and now cant shift it and now I'm being told to lose the stone.
So cant win