You've got to set yourself up to be as healthy as you can. The thing we tend to do is when it gets to be a bit too hard we actually opt out for the absolute worst option. For example if you're in a rush in a morning and you feel like you don't have time to make breakfast you skip it.
Man is fond of counting his troubles but he does not count his joys. If he counted them up as he ought to he would see that every lot has enough happiness provided for it.
