Junk foods and sugar are also chemically addictive because of their effect on the brain’s intrinsic ‘narcotics,’ the endorphins. Sugar, for example, provides a quick fix of endorphins and also temporarily raises levels of the mood
Maté argues that sugar’s action on endogenous opioid systems renders it functionally equivalent to narcotic drugs, grounding symbolic hunger in demonstrable neurochemistry.
, In the Realm of Hungry Ghosts: Close Encounters With Addiction, 2008thesis