It is well known that metformin is a widely used drug to lower blood sugar, but does metformin have other effects? The answer is yes, it also has the effect of lowering blood lipids, controlling weight, prolonging life, anti-tumor, anti-aging, etc. In addition to lowering blood glucose, metformin also affects lipid levels, especially by reducing harmful LDL cholesterol levels. It has been shown that patients with diabetes treated with metformin have a higher life expectancy than other diabetic patients. Among lung-smoking people with diabetes, those taking the diabetes drug metformin have a reduced risk of developing lung cancer. In obese people, metformin reduces hunger and can be used as an adjunct to diet, exercise and other weight loss treatments for weight control in obese people. whitehead institute scientists found impaired tumor cell survival in low glucose environments predicts tumor sensitivity to anti-diabetic drugs. Researchers at Massachusetts General Hospital have found metformin to be effective in inhibiting pancreatic cancer. Researchers at Shantou University School of Medicine found that metformin selectively inhibited the growth of esophageal squamous cell carcinoma, suppressed cell proliferation and induced apoptotic cell death, and researchers at Shanghai Jiaotong University School of Medicine found that metformin also had an inhibitory effect on liver cancer. There is no particularly effective treatment drug for fatty liver, and American scientists have proven metformin to be effective for fatty liver, a common complication of diabetic patients, in mice tests. Metformin can promote brain cell growth and become a potential anti-aging drug, and the related study was published in the journal Cell Stem Cell. In summary, metformin is not only prominent in the treatment of diabetes as we know it, but also has unexpected effects in other areas, and it may bring us more surprises in the future as researchers explore it.