Slim but healthy

If you are one of those people who enjoy a slim and slender body, do you think you are healthy?
Its common knowledge that as the weight increases, so does health problems...but I know of slim people who take it for granted that they are healthy and eat any garbage, and feel they dont need to exercise, because then they might just dissappear.

what do you feel?

i feel everyone needs exercise, esp in this part of the world where life is luxurious and sedantary to a certain extent.