[Blarg]

It causes a quick spike in insulin levels, which promotes storage of fats, can interfere with protein metabolism, and can mess up your energy level, as well as supposedly do all manner of other pernicious things. Normal food(whole wheat, brown rice, stuff that hasn't been denatured by being highly processed) is digested more slowly so it doesn't cause as quick and strong an insulin response. This is the way food is really supposed to be incorporated into our bodies according to our evolution. Highly processed foods like white bread and white flour and white rice skip our body's natural regulation of how fast food gets into our system and piledrive themselves into our system, causing our body to resort to unusual measures in order to stay stable; but those measures are in themselves unhealthy and stressful to the body.