Hi Hopeful and Chirley,
During 15 months my dx was Myelofibrosis and patients with this disease often will be very thin (due to enlarged spleen among other symptoms). Then I decided that I should control my weight carefully and eat more if I started to loose weight.
I have been working with HIV-infected patients and know that it is difficult to gain weight if you have a severe disease like HIV-infection or cancer. This issue is very important and many sites have info about what to do to avoid loosing weight.
http://www.cancer.gov/cancertopics/p.../Patient/page5
Kind regards
Birgitta-A