How do I know the difference between complex and simple carbs?

Generally speaking you are going to want to look for carb sources that say whole grain on the package, this is mainly referring to your pastas, breads and other grain products. If the product in question is something like a potato you will want to go with a red or sweet potato over a white one, for rice brown over white, for a more in-depth view of this check out my other blog at http://changeisachievable.blogspot.com/2011/06/diet-makeover-continued-day-4.html .