Why is it that the food served at our smachot, kiddushes etc. etc. is generally so unhealthy? One answer is that people want to get pleasure NOW and don't really want to think about the ramifications. So BRING ON the oily, fatty kugels and sugar filled cakes!!
This is the same reason that people waste time on nonsense, engage in harmful speech, look at things that should be avoided etc. etc. People want INSTANT gratification, pleasure an easy time etc. etc. What about the long term ramifications? Why think about THEN if you can "live" now??!!
If one is careful not to eat unhealthy foods, that will [in addition to making one healthy:-)] be a GREAT training to living with the long term ramifications of our actions in mind. A physical and spiritual windfall!!!