I think I need to provide more about me here as I can read in the comments.

Well, Its not exercise thing I guess because I do exercise almost daily, at least I want half an hour or I ride bike for 30 minutes...I am not even fat, I am just fit and fine, I am sure quite healthy, dint take any medicine or got sick since I came here and its already been more than 3 years.

About food, hmmm I eat vegetables but of course like everyone I do meat the most. I eat every kind of food (indian, chineese, italians, american, thai) not only Nepali dal bhaat tarkari. I do drink but not excessive sometimes with friends only, may be once a week or once in a two weeks, rarerly twice a week. I am not addicted to it that I drink alone just for fun in gathering. u know what I mean anyway right.

Thats the main problem, I dont have any problems and I amhaving problem...