Eating just one chip (potato crisp, French fries, or whatever you call them) without then devouring the rest is almost impossible for most people to do. Now scientists have worked out why it's so difficult to walk away from tasty but unhealthy food.
The fats in these snacks make trigger a surprising biological mechanism that likely drives our gluttonous behaviour. The culprit is natural marijuana-like chemicals in the body called endocannabinoids, researchers from University of California, Irvine found.
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