Metformin is one of the most widely used medications for managing type 2 diabetes. For decades, it has helped millions of people control their blood sugar levels. However, the drug has recently attracted attention for a different reason: its potential role in slowing biological ageing and promoting a longer, healthier life.

Scientists are investigating whether metformin can influence the biological processes associated with ageing, including inflammation, cellular energy production, and metabolic health. While early research has generated interest, the evidence in humans remains limited. So, can a diabetes medication really help people age more slowly? Here is what current research suggests.

Why Are Scientists Studying Metformin and Ageing?

Ageing involves several changes in the body, including reduced cellular repair, chronic inflammation, declining muscle function, and changes in metabolism. Over time, these changes can increase the risk of conditions such as cardiovascular disease, type 2 diabetes, and certain neurodegenerative disorders.

Metformin is being studied because it may influence some of the biological pathways involved in these processes.

Researchers are particularly interested in three areas:

• Metabolic health: Metformin reduces glucose production in the liver and improves the body's ability to regulate blood sugar.

• Inflammation: Some studies suggest that metformin may influence inflammatory pathways, although its effects vary depending on the individual and the condition being studied.

• Cellular energy production: The drug affects cellular energy-sensing mechanisms, including pathways associated with AMPK, which may play a role in metabolism and cellular maintenance.

Animal studies have reported promising findings regarding lifespan and age-related health. However, results in animals cannot automatically be applied to humans.

What Is the TAME Study?

One of the most widely discussed research initiatives in this field is the TAME study, which stands for Targeting Aging with Metformin.

The proposed clinical trial was designed to investigate whether metformin could delay the development of multiple age-related diseases in older adults who do not have diabetes.

Rather than examining whether the drug directly increases lifespan, researchers aimed to determine whether it could delay the onset of conditions such as cardiovascular disease, cancer, and cognitive decline.

The study has attracted considerable interest because it could help establish whether ageing-related processes can be targeted through medical treatment. However, the proposed trial has not provided definitive clinical results demonstrating that metformin slows ageing in humans.

What Does Existing Research Say?

Research into metformin and longevity has produced encouraging but mixed findings.

Some observational studies have found that people with diabetes who take metformin experience favourable health outcomes compared with certain other groups. Laboratory and animal research has also identified biological mechanisms that could potentially contribute to healthier ageing.

However, these findings have important limitations.

First, observational studies cannot establish that metformin itself caused the observed benefits. Differences in health status, lifestyle, and other treatments may influence the results.

Second, improvements in blood sugar control or the management of metabolic conditions do not necessarily mean that a medication slows the underlying biological ageing process.

Third, evidence suggesting possible benefits for conditions such as cardiovascular disease, neurodegenerative disorders, and osteoporosis does not establish metformin as an effective treatment for all these conditions.

At present, there is insufficient high-quality clinical evidence to conclude that metformin extends the lifespan of otherwise healthy people or reliably slows biological ageing.

Can Healthy People Take Metformin for Anti-Ageing Benefits?

Although metformin is an established medication for type 2 diabetes, taking it solely for anti-ageing purposes is not currently supported by sufficient clinical evidence.

Like other medicines, metformin can cause side effects, including nausea, diarrhoea, and abdominal discomfort. Long-term use can also reduce vitamin B12 levels in some people. In rare circumstances, it can cause a serious complication called lactic acidosis, particularly in people with certain medical conditions, including significant kidney impairment.

Its suitability depends on an individual's health, kidney function, existing conditions, and other medications.

People should not start taking metformin for longevity without medical advice. Those who have been prescribed it for diabetes should continue following their doctor's instructions and should not stop treatment because of emerging research about ageing.

How Can You Support Healthy Ageing Naturally?

Although no medication has been conclusively established as an anti-ageing treatment for healthy people, several lifestyle habits can support long-term health.

• Follow a balanced diet: Include vegetables, fruits, whole grains, pulses, nuts, and other nutrient-rich foods. Limit excessive added sugar and highly processed foods.

• Exercise regularly: Aim for at least 150 minutes of moderate-intensity physical activity each week, along with strength-training exercises on two or more days, as appropriate for your health.

• Prioritise sleep: Most adults benefit from seven to nine hours of sleep each night.

• Maintain a healthy weight: Sustainable eating habits and regular physical activity can improve metabolic health.

• Avoid smoking and limit alcohol: These choices can reduce several long-term health risks.

• Monitor important health indicators: Regular medical check-ups can help identify conditions such as high blood pressure, elevated cholesterol, and diabetes early.

For people living with diabetes, controlling blood sugar through prescribed treatment, appropriate nutrition, and physical activity remains particularly important.

The Bottom Line

Metformin is a promising subject of ageing research because it affects several biological processes linked to metabolism and cellular function. Nevertheless, promising laboratory findings and observational studies are not enough to prove that the drug slows human ageing or extends lifespan.

For now, metformin should be used for established medical indications under a healthcare professional's supervision, rather than as an unproven anti-ageing medication. More well-designed clinical trials are needed before scientists can determine whether it offers meaningful longevity benefits to people without diabetes.