No one knows why willpower can grow
with practice but it must reflect some biological change in the brain. Perhaps neurons in the frontal cortex, which is responsible for planning behavior, or in the anterior cingulate cortex, which is associated with cognitive control, use blood sugar more efficiently after repeated challenges. Or maybe one of the chemical messengers that neurons use to communicate with one another is produced in larger quantities after it has been used up repeatedly, thereby improving the brain’s willpower capacity.
Whatever the explanation, consistently doing any activity that requires self-control seems to increase willpower — and the ability to resist impulses and delay gratification is highly associated with success in life.
http://www.nytimes.com/2008/04/02/opinion/02aamodt.html?em&ex=1207281600&en=93063bbf6c0470e8&ei=5087%0A
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