After drinking four to eight cups of coffee in a day, people’s neurotransmitters related to the endocannabinoid system—the same ones that cannabis affects—decreased. That’s the opposite of what occurs after someone uses cannabis.
Neurotransmitters are the chemicals that deliver messages between nerve cells and cannabinoids are the chemicals that give the cannabis plant its medical and recreational properties. Our body also naturally produces endocannabinoids, which mimic cannabinoid activity.
Further, certain metabolites related to the androsteroid system increased after drinking four to eight cups of coffee in a day, which suggests coffee might facilitate the excretion or elimination of steroids. Because the steroid pathway is a focus for certain diseases including cancers, coffee may have an effect on these diseases as well, researchers say.