Fat

http://drjamescarlson.blogspot.co.uk/2012/02/can-eating-too-much-fat-pro...
Can Eating Too Much Fat & Protein Actually Lead To Increased Fat Storage

http://en.wikipedia.org/wiki/Fatty_acid_metabolism
Fatty acid metabolism. From Wikipedia.

http://www.marksdailyapple.com/how-much-glucose-does-your-brain-really-n...
How much glucose does your brain really need?