Recovering substance dependent people often put on lots of weight and it is not uncommon for them to become obese or morbidly obese.This relates to the question that commenter "Gunther Gatherer" and I have been pondering in the comments: can stimulating reward pathways through non-food stimuli influence body fatness?
It's clear that smoking cigarettes, taking cocaine and certain other pleasure drugs suppress appetite and can prevent weight gain. These drugs all activate dopamine-dependent reward centers, which is why they're addictive. Cocaine in particular directly inhibits dopamine clearance from the synapse (neuron-neuron junction), increasing its availability for signaling.
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