Recent studies suggest that Metformin, a common medication, might have significant effects on the brain, which could lead to new treatment options beyond its established uses.
Originally prescribed for type 2 diabetes and gestational diabetes, Metformin is also recommended for those at risk of developing diabetes and can aid fertility in people with polycystic ovary syndrome (PCOS). It’s quite widely used—around 120 million people take it—and it improves insulin sensitivity to help manage blood sugar levels. But it turns out there’s more to the story.
Last year, researchers at Baylor College of Medicine uncovered that Metformin might influence brain function in ways not previously understood. They’ve highlighted that despite its long history of use—over 60 years—much about its comprehensive effects on the body remains unclear. Yet, this new focus on the brain could expand its potential applications.
Dr. Makoto Fukuda, an associate professor at Baylor, shared insights about Metformin’s role in lowering blood glucose, traditionally attributed to reducing liver glucose output. Other studies indicated an interaction with gut microbiota, yet this research shifted attention to the brain—crucial in regulating body-wide glucose metabolism. The team looked into how the brain could contribute to the drug’s anti-diabetic effects.
They discovered that in the ventromedial hypothalamus—an area of the brain involved in glucose metabolism—a protein named Rap1 is turned off by Metformin’s action. Interestingly, tests on genetically modified mice lacking this protein showed that the drug didn’t lower their blood sugar. When these mice were fed a high-fat diet to simulate type 2 diabetes effects, Metformin lost its blood sugar-lowering efficiency.
In a different approach, researchers injected Metformin directly into the mice’s brains, observing a significant drop in blood sugar even with lower doses compared to oral intake. This finding hints that Metformin may depend on brain interaction for its effectiveness.
Prof. Fukuda mentioned that this could pave the way for diabetes treatments that target brain pathways specifically. Furthermore, since Metformin is also linked to slowing brain aging, there’s a fascinating prospect of whether the same signaling pathways affect these benefits. More research is necessary to explore these avenues further.
What are the side effects of taking Metformin?
As noted by the NHS, common side effects of Metformin—observable in about 1 in 100 users—include:
- Nausea
- Vomiting
- Diarrhea
- Stomach aches
- Loss of appetite
- A metallic taste in the mouth
Additionally, Metformin can lead to vitamin B12 deficiency. Symptoms such as fatigue, muscle weakness, or mouth ulcers, alongside pale or yellow skin, warrant a discussion with a healthcare provider.
