Given its limitations, New Year's resolutions are exactly the wrong way to change our behavior. It makes no sense to try to quit smoking and lose weight at the same time, or to clean the apartment and give up wine in the same month. Instead, we should respect the feebleness of self-control, and spread our resolutions out over the entire year. Human routines are stubborn things, which helps explain why 88% of all resolutions end in failure, according to a 2007 survey of over 3,000 people conducted by the British psychologist Richard Wiseman. Bad habits are hard to break—and they're impossible to break if we try to break them all at once.
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There's something unsettling about this scientific model of willpower. Most of us assume that self-control is largely a character issue, and that we would follow through on our New Year's resolutions if only we had a bit more discipline. But this research suggests that willpower itself is inherently limited, and that our January promises fail in large part because the brain wasn't built for success.
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Since the most popular New Year's resolution is weight loss, it's important to be aware that starving the brain of calories—even for just a few hours—can impact behavior. Skipping meals makes it significantly harder to summon up the strength to, say, quit cigarettes. Even moderation must be done in moderation.
The final piece of the willpower puzzle is distraction. Research by Walter Mischel at Columbia University and others has demonstrated that people who are better at delaying gratification don't necessarily have more restraint. Instead, they seem to be better at finding ways to get tempting thoughts out of their minds.
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