There is a lot more evidence. http://lesswrong.com/lw/10x/the_physiology_of_willpower/ http://lesswrong.com/lw/10x/the_physiology_of_willpower/ -- exerting wil

There is a lot more evidence. http://lesswrong.com/lw/10x/the_physiology_of_willpower/ http://lesswrong.com/lw/10x/the_physiology_of_willpower/ -- exerting willpower leads to glucose-depletion. http://news.ycombinator.com/item?id=848839 http://news.ycombinator.com/item?id=848839 -- this topic has been on here before, though it was a different paper.