A new study has shown that your willpower is linked to how you think willpower works.
In essence, your perceptions and beliefs are far more powerful than you realize.
The study split students into two groups - one was told that willpower was a 'limited resource' that you needed to replenish with rest/breaks from the task at hand, and the other was told that willpower was inexhaustible.
Those who were told that willpower was limited ended up procrastinating 35% more on demanding tasks, and ate 24% more junk food. Those who were told that willpower was unlimited ended up powering through tasks and procrastinated far less.
Just think about it. Apparently was have an inexhaustible supply of mental effort on call. That's pretty impressive, and it has implications for addiction and obesity treatments.