Willpower is like a muscle. It becomes fatigued with use, and after a fairly short period of time, it gives out. One of the best experiments that demonstrated the limits of willpower was the famous radishes-and-cookies study. This study relied on deception. Volunteers were told that they were signing up for a food-tasting study. Here is how one scientist described it: The laboratory room was carefully set up before participants in the food conditions arrived. Chocolate chip cookies were baked in the room in a small oven, and, as a result, the laboratory was filled with the delicious aroma of
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