By Yale University.
Lead author Tamas Horvath and his colleagues set out to monitor the brain circuitry that promotes eating by selectively manipulating the cellular pathway that mediates marijuana’s action on the brain, using transgenic mice.
Image via Everything About Weed
“It’s like pressing a car’s brakes and accelerating instead,” he said. “We were surprised to find that the neurons we thought were responsible for shutting down eating, were suddenly being activated and promoting hunger, even when you are full. It fools the brain’s central feeding system.”
In addition to helping explain why you become extremely hungry when you shouldn’t be, Horvath said, the new findings could provide other benefits, like helping cancer patients who often lose their appetite during treatment.
Researchers have long known that using cannabis is associated with increased appetite even when you are full. It is also well known that activating the cannabinoid receptor 1 (CB1R) can contribute to overeating. A group of nerve cells called pro-opiomelanocortin (POMC) neurons are considered as key drivers of reducing eating when full.
“This event is key to cannabinoid-receptor-driven eating,” said Horvath, who points out that the feeding behavior driven by these neurons is just one mode of action that involves CB1R signaling. “More research is needed to validate the findings.” Whether this primitive mechanism is also key to getting “high” on cannabis is another question the Horvath lab is aiming to address.