Type 2 Diabetes: Combining GLP-1 Therapy with Lifestyle Changes Reduces Heart Risk

Individuals with type 2 diabetes (T2D) can significantly lower their risk of cardiovascular disease by combining the apply of GLP-1 receptor agonists (GLP-1 RAs) with adopting healthy lifestyle habits, according to a new study published in The Lancet Diabetes & Endocrinology on February 25, 2026. The research highlights that these two strategies are complementary, rather than mutually exclusive, in improving cardiovascular outcomes.

The Power of Combination

The study, led by researchers at Harvard T.H. Chan School of Public Health and the Department of Veterans Affairs Boston Healthcare System, is the first large-scale investigation to examine the combined effects of healthy habits and GLP-1 RAs on heart health. Researchers analyzed data from over 98,000 adults with T2D and no prior cardiovascular disease, utilizing information from the Veterans Affairs’ Million Veteran Program spanning from 2011 to 2023.

“Our findings underscore that, even in the era of highly effective GLP-1 pharmacotherapy, lifestyle habits remain central to diabetes management and cardiovascular risk reduction and can substantially amplify the benefits of modern medications,” said Frank Hu, Fredrick J. Stare Professor of Nutrition and Epidemiology and chair of the Department of Nutrition at Harvard T.H. Chan School of Public Health.

What Constitutes a Healthy Lifestyle?

The researchers considered several factors when assessing lifestyle habits, including:

• Healthy diet
• Regular exercise
• Not smoking
• Restful sleep
• Minimal alcohol intake
• Solid stress management
• Social connection and support
• No opioid use disorder

Significant Reduction in Cardiovascular Events

The study focused on major adverse cardiovascular events (MACEs), defined as non-fatal stroke, myocardial infarction (heart attack), or cardiovascular death. The results demonstrated a substantial reduction in MACE risk for those who combined a GLP-1 RA with a healthy lifestyle.

Specifically, participants who used a GLP-1 RA and adhered to six to eight healthy habits experienced a 43% lower risk of MACE compared to those who did not use a GLP-1 RA and adhered to three or fewer healthy habits. The study showed that both healthy habits and GLP-1 RA usage independently contributed to improved heart health.

• Adhering to all eight healthy habits resulted in a 60% lower risk of MACE compared to adhering to one or fewer.
• GLP-1 RA usage was associated with a 16% lower MACE risk compared to non-usage.

Public Health Implications

Hu emphasized the broader public health implications of the findings. “From a public health perspective, the results underscore the continued importance of population-level investments and policy in promoting healthy diet, physical activity, sleep, stress management, and social connection, even in a modern drug era,” he stated. “As novel therapies expand, scalable lifestyle interventions remain essential for reducing the overall burden of cardiovascular disease and other chronic diseases.”

Study Limitations

The researchers acknowledged certain limitations of the study. The observational nature of the data means there’s a possibility of residual confounding factors, such as socioeconomic status, although these were accounted for in the analysis. The study population primarily consisted of white male veterans, which may limit the generalizability of the results to other populations. However, the researchers noted that the overall findings remained consistent across different racial and ethnic groups and between men and women.