Does Blood Flow Cause Hair Loss?

So just a quick question Parents both have full heads of hair and only 1 great grandfather died bald. I lead a pretty sedentary lifestyle and am probably even on the obese side. Does any of this have an effect on hair? I’ve been for a couple months now and it wasn’t until today that it finally started to affect my hairline. Fullness is basically gone. Will working out help?

The scalp has a very rich blood flow. Hair loss is not caused by inadequate blood flow. Hair loss is genetic. As the hair is lost, the body diverts the blood away from the hair as the hair volume reduces.  We know this because when we put hair transplants into a bald area that had reduced its blood supply, the blood supply returns proportional to the hair we put back in.