When it comes to health, it's good to have a few rules of thumb and stick to it. My favorite one right now is to try to not buy or eat anything that comes in a package.
Think about it, most things that come in a package need chemicals to keep it fresh or edible. Thus, my number one enemy: corn syrup. Some of you may know that corn syrup, especially the partially hydrogenated kind, has been linked to type II diabetes. I just don't like the taste. Sodas and most packaged baked goods have them. Check those labels, even most bread has corn syrup. I only found this out b/c I recently bought bread for a road trip and had to put so many loaves back.
Also, there is the money one saves by buying natural food. Buying packaged food is essentially letting someone else take another cut in the money chain. Very few desserts will be cheaper and healthier than the ones that one bakes by oneself.
Of course, there are always exceptions to the rule, otherwise, life will be too boring. My exceptions to the rule? OJ, soymilk, miso and CHOCOLATE! (There are many more, but that's between me and my grocery store clerk.)
