This Popular Diabetes Drug Affects Brain: Study

<span>Metformin Brain</span>: A popular diabetes drug, prescribed to manage type 2 diabetes by controlling blood sugar, which has been in use for 60 years - <span>metformin</span>, now shows how it is directly linked to the brain. 

A drug used for over six decades did not have a study that made scientists sure of exactly how it works, until now. Researchers from the Baylor College of Medicine in the US were able to identify in 2025 a brain pathway that the drug seems to work through. It also has impacts on biological processes in other areas of the body. 

"It's been widely accepted that metformin lowers blood glucose primarily by reducing glucose output in the liver. Other studies have found that it acts through the gut," said Makoto Fukuda, a pathophysiologist at Baylor.

In a 2025 study on mice, researchers observed that metformin travels to the VMH and switches off Rap1 activity. This action appears to be crucial for its ability to control blood sugar. To test this further, scientists bred mice that lacked Rap1. In these mice, metformin no longer improved diabetes-like symptoms, even though other medications still worked.

This points to something important. Metformin may be working through a completely different pathway compared to other diabetes drugs, one that depends on the brain.

Read: <a href="https://www.healthandme.com/health-wellness/metformin-controls-blood-sugar-with-help-from-brain-neurons-finds-study-article-153925574" data-type="tilCustomLink">Metformin Controls Blood Sugar With Help From Brain Neurons, Finds Study</a>

The researchers also identified specific nerve cells involved in this process. They found that SF1 neurons become active when metformin enters the brain, suggesting these cells play a direct role in how the drug works.

These findings could change how doctors and scientists think about diabetes treatment. If metformin’s brain pathway is confirmed in humans, future therapies could be designed to target these exact neurons, making treatments more precise and possibly more effective.

There is also a bigger picture. Metformin has already been linked to benefits beyond diabetes, including slowing aspects of brain aging and improving longevity. In one study involving postmenopausal women, those taking metformin had a significantly lower risk of dying before the age of 90 compared to those on another diabetes drug.

Read: <a href="https://www.healthandme.com/health-wellness/metformin-can-help-lower-risk-of-age-related-vision-loss-study-article-153928047" data-type="tilCustomLink">Metformin Can Help Lower Risk Of Age-related Vision Loss: Study</a>

While the results are promising, human studies are still needed. If confirmed, this discovery could open the door to new treatments that not only manage blood sugar better but also tap into the brain’s role in overall health and aging.

It also reinforces an emerging idea that metformin is not just acting on the body’s metabolic organs, but quietly influencing the brain at much lower doses.

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Metformin Brain: A popular diabetes drug, prescribed to manage type 2 diabetes by controlling blood sugar, which has been in use for 60 years - metformin, now shows how it is directly linked to the brain. A drug used for over six decades did not have a study that made scientists sure of exactly how it works, until now. Researchers from the Baylor College of Medicine in the US were able to identify in 2025 a brain pathway that the drug seems to work through. It also has impacts on biological processes in other areas of the body. "It's been widely accepted that metformin lowers blood glucose primarily by reducing glucose output in the liver. Other studies have found that it acts through the gut," said Makoto Fukuda, a pathophysiologist at Baylor."It's been widely accepted that metformin lowers blood glucose primarily by reducing glucose output in the liver. Other studies have found that it acts through the gut," said Makoto Fukuda, a pathophysiologist at Baylor.What the Study FoundIn a 2025 study on mice, researchers observed that metformin travels to the VMH and switches off Rap1 activity. This action appears to be crucial for its ability to control blood sugar. To test this further, scientists bred mice that lacked Rap1. In these mice, metformin no longer improved diabetes-like symptoms, even though other medications still worked.This points to something important. Metformin may be working through a completely different pathway compared to other diabetes drugs, one that depends on the brain.Read: Metformin Controls Blood Sugar With Help From Brain Neurons, Finds StudyThe researchers also identified specific nerve cells involved in this process. They found that SF1 neurons become active when metformin enters the brain, suggesting these cells play a direct role in how the drug works.Why This MattersThese findings could change how doctors and scientists think about diabetes treatment. If metformin’s brain pathway is confirmed in humans, future therapies could be designed to target these exact neurons, making treatments more precise and possibly more effective.There is also a bigger picture. Metformin has already been linked to benefits beyond diabetes, including slowing aspects of brain aging and improving longevity. In one study involving postmenopausal women, those taking metformin had a significantly lower risk of dying before the age of 90 compared to those on another diabetes drug.Read: Metformin Can Help Lower Risk Of Age-related Vision Loss: StudyWhat Comes NextWhile the results are promising, human studies are still needed. If confirmed, this discovery could open the door to new treatments that not only manage blood sugar better but also tap into the brain’s role in overall health and aging.It also reinforces an emerging idea that metformin is not just acting on the body’s metabolic organs, but quietly influencing the brain at much lower doses.

this popular diabetes drug affects brain: study metformin brain

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