I’m having trouble writing this post because I’m hungry. This is something anyone who’s read Willpower: Rediscovering the Greatest Human Strength would appreciate. Roy F. Baumeister and John Tierney write that willpower is finite–you only have so much willpower-giving glucose in your brain–and it can be used up. In my case, I used my willpower sitting and reading the last 1/3 of this book while I could have been snacking, watching TV, playing video games or writing. The good news is that willpower can be strengthened and not just through food. The authors explain willpower’s hows and whys, mirroring research with actual people who have or don’t have willpower.