Dhruv Khullar

Now, for a long time, GLP-1 was thought to be mainly about digestion.

But it's now clear that the medications affect much more than eating.

They might have some of their most surprising effects not in the gut, but in the brain.

Stories like Mary's have led scientists to consider whether these medications could be helpful for all sorts of addictions, from alcohol and cocaine to gambling and compulsive shopping.

Research has found that GLP-1s might help people stop smoking, reduce their cravings for opioids, lead them to consume fewer drinks.

As one neuroscientist put it, GLP-1s might be telling us that there is some type of universal pathology when it comes to addiction and that they are part of how we fix it.

Now, that is a tantalizing prospect, that there's a general-purpose key that unlocks the path to moderation.

But that's what GLP-1s seem like they could be, moderation molecules.

They don't extinguish our desires, but they help us keep them in check.

And no one knows exactly why.

One possibility is that they modulate what's called the brain's mesolimbic pathway, sometimes referred to as the reward system.

alcohol, nicotine, cocaine, social media, they all increase dopamine release in that pathway.

And GLP-1s, they might be limiting the spikes of dopamine.

So mice that are on the medications and given cocaine, they have smaller surges of dopamine, but they otherwise seem to maintain adequate amounts of the neurotransmitter.

GLP-1s could be calming the water without draining the pool.

At the other end, GLP-1s might make it easier to stop using a drug.

Research that's currently under review has found that animals that are addicted to opioids and given a GLP-1, they have less activity in a part of the brain that's involved with withdrawal.

So again, these medications could lead to moderation, not just because they make a drug less pleasurable, but because they make abstinence less painful.

Now, at this point, we should probably moderate our own enthusiasm about the moderating effects of these medications.

Like any drug, GLP-1s won't work for everyone.