The Dragon Boat Festival is a custom seemingly kept going by willpower, surrounded by the remains of a great tradition of endeavour.

BBC: Here be dragons

While some experts argue that people who are obese should simply eat less and exercise more, many physicians who treat obesity say it is driven by biological changes in the body, not lack of willpower.

WSJ: New Diet Pills Offer Option to Off-Label Obesity Drugs

When your brain detects a discrepancy, it reacts by throwing resources at it: attention, effort, deeper processing of information, and willpower.

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