Assertion: food craving | /r/HasProperty | linked to prehistoric times
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text: Dr. Leigh Gibson, Reader in Biopsychology at Roehampton University, told The Daily Mail that "[f]rom an evolutionary point of view, junk food cravings are linked to prehistoric times, when the brain's opioids and dopamine [chemicals related to concentration and pleasure, which establish habits] reacted to the benefit of high-calorie food as a survival mechanism ...