[ap22213]

I'm wondering if it's just because those foods happen to also be foods with low glycemic index [0].

Based on an NPR story I heard yesterday [1] (if correct), I'd guess that you'd get similar results eating any of those types of foods [2].

[0] http://en.wikipedia.org/wiki/Glycemic_index

[1] http://www.wbur.org/npr/160757730/low-and-slow-may-be-the-wa...

[2] http://ajcn.nutrition.org/content/76/1/5/T1.expansion.html

[jc4p]

Some other reading on the factuality of the importance some people/diets are putting on the glycemic index: http://alanaragon.com/glycemic-index

The conclusions part is pretty great.