For decades, metformin has been considered one of the most trusted treatments for type 2 diabetes.
Doctors around the world prescribe it to millions of patients because it helps lower blood sugar levels and can reduce the risk of serious health problems linked to diabetes.
Type 2 diabetes is a condition where the body struggles to properly control sugar levels in the blood. Normally, insulin helps move glucose from the bloodstream into cells where it is used for energy.
But in people with diabetes, this process becomes less effective. As a result, sugar builds up in the blood and slowly damages the body over time.
High blood sugar can harm blood vessels, nerves, kidneys, the eyes, and the heart. This is why controlling blood sugar is so important. Along with healthy eating, exercise, and weight control, medications like metformin are often used to help people manage the disease.
Even though metformin has been used for more than 60 years, scientists have continued debating exactly how it works. The traditional explanation was that metformin mainly acts on the liver by reducing glucose production. Medical textbooks and treatment guidelines have repeated this explanation for many years.
However, a new study from Northwestern University suggests the real story may be much more complicated. According to the study, published in Nature Metabolism, metformin may actually work mainly inside the intestine.
Researchers found that the drug changes how gut cells produce energy. Instead of focusing on the liver, metformin may help intestinal cells absorb and burn extra sugar directly from the bloodstream.
The research team studied mitochondria, tiny structures inside cells that create energy. Mitochondria are sometimes compared to batteries or engines because they power many important functions in the body.
The scientists discovered that metformin blocks part of the mitochondria’s normal energy-making process in gut cells. When this happens, the cells switch to using more glucose as fuel. This increased sugar use may help reduce blood sugar levels throughout the body.
Professor Navdeep Chandel from Northwestern University explained that the intestine may play a much bigger role in blood sugar control than researchers previously realized. According to him, metformin may turn the gut into a system that removes extra sugar from the bloodstream after meals.
This idea could explain several unusual effects doctors have noticed in patients taking metformin. For example, many people taking the drug tend to have lower blood sugar after eating. The new findings suggest this may happen because intestinal cells are using more glucose.
The study also explains why people taking metformin often show changes in certain hormones and blood chemicals. One of these substances is GDF15, a hormone linked to reduced appetite and weight loss. Another is citrulline, a chemical produced by mitochondria in the small intestine.
Researchers believe that when metformin stresses the mitochondria in gut cells, the body responds by changing metabolism and appetite signals.
The study also looked at berberine, a plant-based supplement that has recently become very popular online for blood sugar control. Some social media posts describe berberine as a natural alternative to newer diabetes drugs.
Interestingly, the scientists found that berberine seems to affect the same biological pathway as metformin in the intestine. However, the researchers strongly warned that metformin has decades of scientific evidence supporting its use, while berberine has not been studied nearly as carefully.
To test their ideas, the scientists created special mice with genetically modified intestinal cells. These cells were designed to resist metformin’s effects on mitochondria.
In those mice, metformin no longer lowered blood sugar effectively. This gave researchers strong evidence that the intestine is one of the drug’s key targets.
The findings may open the door to new diabetes treatments in the future. Scientists may try to design medicines that target the gut more directly instead of mainly focusing on the liver.
The research also highlights how connected the body’s systems are. A medicine designed for blood sugar control may also influence appetite, metabolism, digestion, and weight.
At the same time, experts caution that the research is still in an early stage. Since the experiments were mainly done in mice, more studies in humans are necessary before scientists can fully rewrite the medical understanding of metformin.
Still, many researchers believe this work is important because it challenges old assumptions and provides a more detailed explanation for how the medication works. The study also helps explain why metformin has such wide-ranging effects on the body.
After reviewing the findings, the study appears scientifically strong because it used carefully designed experiments to directly test how intestinal cells respond to metformin.
The use of genetically modified mice gave the researchers powerful evidence supporting their theory. However, it is important to remember that mouse studies do not always perfectly predict what happens in humans.
Future human studies will be critical before these findings can fully change diabetes treatment approaches. Even so, the research offers a promising new direction for understanding blood sugar control and may lead to better therapies in the future.
If you care about diabetes, please read studies about Vitamin D and type 2 diabetes, and to people with diabetes, some fruits are better than others.
For more health information, please see recent studies that low calorie diets may help reverse diabetes, and 5 vitamins that may prevent complication in diabetes.
Source: Northwestern University.
