[jcl]

The analogy is true, insofar as there are experiments that support it.

https://www.google.com/search?q=willpower+muscle+research

More interestingly, there is research that suggests that believing that willpower is like a muscle impairs willpower. :)

http://pss.sagepub.com/content/21/11/1686

[disgruntledphd2]

Thanks for that, I read that study when it came out (the second one) but could never find it again.

[KirinDave]

That is an amazing study! Thanks for bringing it up!