Willpower, it turns out, is more like a reservoir than a river. If we deploy willpower in one decision, we have less self-control available for our next decision. Many of our worst dietary choices, for example, are made in periods of low self-control—at the end of a long day when a big glass of cabernet or a pint of Ben and Jerry's calls out our name.
-Donald Sull and Kathleen M. Eisenhardt, Simple Rules: How To Thrive In A Complex World
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