FLASH
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Ozempic has entered the lives of millions of people in recent years with the intention of primarily affecting the stomach and appetite. However, Alison Shapiro, an assistant professor at the University of Colorado Anschutz, was surprised to discover significant changes in the brain that may be linked to the use of this particular drug.
Alison was part of a research team that studied 13 teenage and young women with hormonal disorders who were given GLP-1 drugs, such as Ozempic. As part of tests to record the drug's effect on their bodies, Shapiro took brain scans before and after the treatment and found that extensive changes had occurred.
Within just a few months, the brain's connections in the Primary Attention Network, which focuses on attention, had multiplied.
"We didn't expect to see this result and we really don't know what it means," says Shapiro.
Ozempic and other GLP-1 drugs were initially touted as a breakthrough in the field of metabolism: drugs that act like hormones to control hunger, blood sugar, and weight. But as scientists delve deeper into how these drugs work, early evidence suggests that GLP-1 may also reshape parts of the brain.
-Ozempic and brain changes
Tens of millions of people around the world are now taking these drugs, transforming what began as a treatment for obesity and diabetes into what may be modern medicine's largest unintended experiment in the field of neuroscience.
Scientists are studying GLP-1, drugs that mimic hormones involved in appetite, blood sugar, and digestion, to see if they ultimately affect not only eating behavior, but also addiction, cognitive function, neurodegeneration, and even pleasure.
The new research on GLP-1 is part of a broader scientific shift away from treating brain health and physical health as separate fields. Scientists increasingly see the two as closely linked.
It's worth noting, however, that not all of the reported mental effects of GLP-1 drugs are positive. On social media and in doctors' offices, some users have reported a kind of "brain fog," while others have reported something broader and harder to pin down: a strange emotional "flatness." Some people also describe less enjoyment, decreased interest in hobbies, and even decreased sex drive.
-The mystery of how it works
The hormones and receptors targeted by GLP-1 drugs form a vast communication network that extends far beyond the stomach. The system, which is normally activated after eating, helps regulate hunger, blood sugar and digestion, but the receptors are distributed throughout the body, including the heart and some areas of the brain.
Scientists are still in the early stages of research into how GLP-1 drugs affect neural networks. Because these drugs are relatively large molecules, scientists are not yet sure how much of them can cross the blood-brain barrier, a protective membrane that isolates the brain from the bloodstream.
This uncertainty has raised a broader question: Do the drugs act directly on the brain, or do they remodel the nervous system more indirectly?
Scientists suspect that both may be true. Some studies suggest that GLP-1 helps reduce inflammation that can damage neurons over time, while other studies suggest that the drugs may help brain cells survive and function more efficiently.
One of the leading theories is that GLP-1s may reduce inflammation in the brain. Other scientists hypothesize that these drugs may act more directly on the brain cells themselves, helping them function more efficiently and resist stress. These two effects may occur simultaneously.
Scientists are also investigating whether this change process originates in the gut rather than the brain. Naturally occurring GLP-1 hormones communicate with the brain via the vagus nerve, the long signaling pathway that connects the digestive system to the brain and guides feelings of hunger and satiety. Scientists suspect that these gut-brain circuits may also influence mood, cravings, and cognitive function.
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