What I meant was, you can train yourself to like healthy foods, to the point of craving them. Me, just eating one small burger from McDonald's makes me sick now.
As for exercising, it make you feel good. It really does. It's a real buzz after an mere half hour of cycling or swimming.
And then, in the grand scheme of things, when your health is good, you generally feel good too.
Staying healthy makes you feel good, but it does so in the medium to long run, and it takes a bit of effort to get going. Chocolate provides immediate, short-term and effortless pleasure. But it's not good for you. Don't you think it's worth investing a little effort for a few months to train yourself to enjoy a healthy lifestyle, so that you can feel good all the time afterward?