Hi, surely will help you.
See, there are many reason of not gaining weight.
. Endrocrine problems
. IBS
. Dietary problem
.
Liver problem
. Tuberculosis
.
Vitamin and minerals deficiencies
. GI (Digestive)problem
. Improper sleep
. Stress
And many more
HOW WE TREAT Underweight thru DIET
. Find the main cause and Deficiency which cause hidderence in weight gain
. TREAT the cause first.
. Increase your appetite
. Reduce the Deficiencies occurring in the body thru diet
. And at last you will easily gain weight without much effort.
So, better to consult through the link below,so that we can discuss in detail and suggest you accordingly.