Children's ability to delay gratification, measured by the famous ‘Marshmallow Test’, has increased in recent decades. https://www.sciencedirect.com/science/article/abs/pii/S0160289620300295 …pic.twitter.com/YDlxo5VbYX
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In the first experiment (Mischel & Ebbesen, 1970) it was an animal cookie or a pretzel, which, like a marshmallow, may be less appealing to kids who get to eat some chocolate almost daily.
That may not exclude the possibility that responsible parents tend to educate their children that too much sweets are not that healthy ;-p (Yes, it's kinda circular reasoning if they'll eat anyway)
Furthermore nowadays' treats may contain less sugar, thus reducing overall sugar craving behaviour
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