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Willpower requires an expenditure of glucose in the brain [1]. When one is used to a high-sugar diet, the blood sugar burns off quickly, despite being slowed by insulin response, and the body craves more, with the brain being glucose-depleted to resist the impulse. This is not to absolve anyone of personal responsibility, but like gambling, it is a losing proposition over time.

The fact is, we're all wired a little differently. Some who drink too much can simple moderate; some find the need to temporarily or permanently quit drinking altogether. Anyone trapped in the "metabolic syndrome" of a sugary diet will probably be more successful doing the latter.

[1] http://www.amazon.com/Willpower-Rediscovering-Greatest-Human...

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