Does metformin help with weight loss?
Metformin helps with weight loss, but the effect is modest: expect a few kilograms, not a dramatic transformation. Lifestyle changes work better in the short term, but weight loss with metformin remains stable over the long term. Discuss it with your doctor if you want to know whether it suits your situation.
Metformin does help with weight loss, but the effect is modest and depends strongly on your starting situation. In an observational study of 154 people with overweight or obesity, participants who received metformin lost an average of 5.8 kg over six months, while the untreated group gained an average of 0.8 kg. People with severe insulin resistance benefited the most.
The large Diabetes Prevention Program, with more than 3,200 participants, confirms that metformin produces weight loss, but also shows that an intensive lifestyle programme (aimed at 7% weight loss) is considerably more effective. Metformin is therefore not a substitute for exercise and healthy eating. One notable finding: after ten years of follow-up, the weight loss in the metformin group turned out to be more stable than in the lifestyle group, which initially lost more but subsequently regained some of it.
How metformin influences weight has been reasonably well studied. The drug raises the blood level of a hormone that suppresses appetite via the brainstem. More than 60% of the weight effect is thought to work through this mechanism, as shown by both animal studies and two smaller clinical studies in humans. Other possible pathways, such as influencing gut bacteria or appetite centres in the brain, have not yet been well established and remain hypotheses for the time being.
Metformin is not equally suitable or equally effective for everyone. People with insulin resistance appear to benefit more. In women with PCOS (a hormonal condition involving irregular cycles and elevated male hormones), metformin is sometimes combined with other agents for weight management, but the results of this are mixed. Metformin is not a standard weight-loss drug and in the Netherlands is available by prescription only, so discuss it with your doctor if you think you might benefit from it.
Based on two large randomised studies (DPP, n>3,200), one observational study (n=154), and mechanistic research (mouse studies plus two small clinical studies). DPP data available up to 10 years of follow-up.
How does metformin work in your body?
Metformin lowers blood sugar primarily by causing the liver to produce less new glucose, without the risk of dangerously low blood sugar. Exactly how all the pieces of the mechanism fit together is not yet fully clear.
Does berberine help with weight loss?
Berberine leads to modest weight loss in some studies, but a large, well-designed study found no effect on visceral abdominal fat. It is not a powerful slimming agent, but may offer additional benefits for people with elevated cholesterol.
Does berberine help against high blood sugar (the natural metformin)?
Approach this with caution. Berberine measurably lowers blood sugar, but EFSA was unable to establish a safe intake level due to indications of DNA damage and liver injury, an EU procedure is underway that could lead to restrictions, and it has strong interactions with medications. Do not use it on your own, especially not alongside diabetes medication or during pregnancy.
Does drinking water help with weight loss?
Drinking water probably helps with weight loss, especially when done before meals or used to replace sugary drinks. The effect is modest and works best as part of a broader diet.
Does metformin help you stay healthy for longer?
Metformin can largely prevent diabetes in people with prediabetes or metabolic syndrome, and that brings real health benefits. Whether it also slows ageing in healthy people has not yet been demonstrated.
What are the side effects of metformin?
Metformin causes gastrointestinal complaints such as diarrhoea, nausea and vomiting in a substantial proportion of users. Discuss with your doctor whether the dose can be built up gradually, or consider an alternative if the complaints persist.