I don't have any tangible credentials (read: I'm not a doctor), but my data comes from being mildly obsessed about nutrition (heredity isn't on my side) and from reading as much as I possibly can about nutrition (American Society for Nutrition, the National Agricultural Library, etc). Plus, it helps that I'm an engineer, I tackle most problems by amassing as much data as I can before actually doing what I should be doing.

Carbohydrates are important... they just shouldn't be overdone. Especially the refined ones. Milk = good, fruits = good, whole grain bread = decent, Wonderbread = crap.

Errr, I'm sorry Speek, I wasn't pointing my comment at you (I realize how it could look that way due to the way comment parentage works here).

Kingkongrevenge has some.... interesting viewpoints on diet, so I was asking him where he got his information; sorry for the confusion!