What is it about chocolate?! Is there an evolutionary advantage ?

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I love chocolate so very much! It feels like there is some essential nutrient in chocolate that makes me feel fulfilled. I would like to better understand this experience. It seriously makes me feel really great, and I don't feel complete with out it!Is there an evolutionary advantage to eating chocolate? When did people start eating chocolate? Did it's discovery lead to advancements in human consciousness? What does research show about the psychoactive affects?