Diet and... well, Diet

I keep hearing about diet and exercise.  I am convinced of the efficacy of diet, but I really am not a fan of exercise.  My doctor is willing to consider walking as exercise but since nothing hurts and I can breathe, I may not be doing it right.  But I'm not planning on having joints replaced if I can help it.  Larry did all kinds of sports and was thin.  He hit a certain age and wham!  Bad health hit.  I wasn't thin and did as little as possible.  I hit a certain age and wham!  The type 2 diabetes monster started stalking me.  I think maybe exercise is a lie from people who own gyms and sell fitness equipment.  Or not.  I don't know.