Heart 2 Heart Question

My father-in-law had to have quadruple bypass surgery due to some massive blockage around his heart. For those of you who don’t know, bypass surgery is when they take the good veins from the legs and go around, or bypass the bad arteries or aorta.

After he recovered, he complained he still has to watch his diet otherwise, he’d back for another bypass. Apparently the veins in your legs don’t get clogged with cholesterol and plaque. So why don’t they just move your heart down to your leg instead?