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An increasing proportion of human food consumption appears to be driven by pleasure, not just by the need for calories. In addition to its effects on body mass and health, the food environment in affluent societies may be creating an appetitive counterpart to the psychological effects of other hedonically-driven activities such as drug use and compulsive gambling. This phenomenon is referred to here...
Microinjection of opioid agonists, such as morphine, into the nucleus accumbens shell produces increases in eating behavior (i.e. 'wanting' for food). This study (1) reports direct evidence that activation of accumbens opioid receptors in rats also augments food 'liking', or the hedonic impact of taste, and (2) identified a neural site that definitely contains receptors capable of increasing food...
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