The Real Reason You Can't Stick to a Diet (It's Not Willpower)
2026/07/07
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The Real Reason You Can't Stick to a Diet (It's Not Willpower)
Every failed diet gets blamed on the same thing: a lack of willpower. But willpower is not the primary driver of dietary success or failure. The research on behavior change and neuroscience tells a very different story — one that completely reframes why some people eat well consistently while others struggle despite genuine effort and motivation.ADVERTISEMENT
Willpower is a finite, depletable resource that diminishes throughout the day as cognitive demands accumulate. Studies by Roy Baumeister and others have demonstrated that people make progressively worse decisions about food as the day goes on, not because they become lazier, but because decision fatigue impairs executive function.
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