[lneves]

So the brain is, in a way, executing before the data is available (energy in this case).

You can absorb drugs on your mouth: http://silversol.110mb.com/use/sublin.htm

I would think that carbs are also readily absorbed in some quantity without the need of ingesting them.

[vinutheraj]

Glucose, galactose and fructose are absorbed in the small intestine, although a small amount of glucose is absorbed through the mouth.

http://www.nutritionnook.com/carbohydrates.php

http://www.northland.cc.mn.us/biology/bluetick/nutrition/lec...