Why Is It No Matter What The Issue Is ?

Why is it no matter what the issue is ? Dr try to blame everything on weight. No matter what the symptoms are . Dr say its weight ? Im 40 lbs over weight . had a leg problem Dr say weight. Have low Test. weight. Everything is weight weight weight. Im 46 . alot of healthy people who are in mid 30 are droping dead alot it seams , Dr say its just there time . but if a person is overweight . Well it is his weight . So my Question is Why do Dr blame everything on wieght instead of doing the work and trying to find what is really wrong with people