"I want to pass something by you," I said to my friend Jori* who has lost 80 pounds over the past six months. "Our ability to lose weight is based on our willingness to suffer through discomfort. To be a little hungry and yet to resist the temptation of eating."

"You're wrong," he said. "You don't know what my hunger is like. It's painful. Withstanding it might work for a week or two, but not for the long term."

I immediately knew that Jori was right. Discipline, willpower and self-control are unsustainable. Eventually, we weaken. Read complete Harvard Business Review blog.

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