I am 48, have had a hysterectomy at 35, have been diagnosed with anorexia, how will menopause effect me. my weight is currently 40kgs. ?

Menopause: True menopause occurs on average at age 54. If your hysterectomy did not include removal of both ovaries, you will have symptoms of menopause ("hot flashes", irritability, etc.) long before age 54. Depression can be a result of ovarian failure and your anorexia can be increased therefrom. Treatment for anorexia is generally psychologic therapy, but further weight loss should be avoided.

Slower Metabolism: How weight changes after entering menopause is quite variable women to women. In general, the metabolic rate slows down and there is some weight gain. Best wishes!

Low weight risk.: Just like obesity, low weight can have some bad effects on your health including osteoporosis. Women who are too thin also have renal and cardiac issues as well.

Anorexia: Anorexia is likely to be an emotional issue. I suggest you first set up an appointment with a Psychologist. You will soon learn if this is the best approach or if you need to see a gastrointestinal specialist and/or neurologist.