Does Diabetes Really Worsen the Severity of Covid-19 in Hospitalized Adults?
A comprehensive analysis of 29 studies conducted in 15 countries reveals that adults with diabetes have a higher risk of developing a severe form of Covid-19. Researchers compared the frequency of diabetes in patients with severe and non-severe forms of the disease. Their findings show that diabetes is three times more common in people hospitalized for severe infection than in those with mild cases.
Diabetes is a metabolic disease that disrupts blood sugar regulation and weakens the immune system. In diabetic patients infected with the virus, an excessive inflammatory response is often observed. This reaction can damage tissues and cause complications such as respiratory distress or organ failure. Additionally, diabetes promotes vascular disorders, increasing the risks of blood clots and organ damage—two key factors in severe cases of Covid-19.
The analyzed studies involved over 13,000 hospitalized patients between 2020 and 2024. While the results confirm a link between diabetes and disease severity, they do not establish a direct causal relationship. Indeed, the data primarily come from observations not adjusted for other risk factors such as obesity or cardiovascular diseases. These factors could also influence the progression of the disease.
Geographical differences also play a role. In Asia, the risk associated with diabetes appears more pronounced than in Europe, but these variations could be explained by disparities in healthcare systems or diagnostic methods. Researchers also emphasize that the severity of Covid-19 depends on many other factors, such as age, sex, or the presence of other chronic diseases.
This analysis highlights the importance of closely monitoring diabetic patients in case of infection. Tailored management, including strict blood sugar control and particular attention to signs of worsening, could help reduce complications. However, the conclusions remain cautious, as the available studies do not determine whether diabetes alone is sufficient to explain this worsening or if it acts in combination with other health issues.
The underlying biological mechanisms include chronic inflammation and immune system disruptions, which are common in diabetics. These characteristics make their bodies more vulnerable to the virus. Healthcare professionals are therefore encouraged to consider diabetes as a warning sign for enhanced monitoring, while taking into account each patient’s overall context.
Information and Sources
Scientific Reference
DOI: https://doi.org/10.1186/s12982-026-01644-4
Title: Association between diabetes mellitus and COVID-19 severity in hospitalized adults: A systematic review and meta-analysis
Journal: Discover Public Health
Publisher: Springer Science and Business Media LLC
Authors: Kanwal Khalid; Michelle Felicia Lee; Amr Adel Ahmed Abd El-Aal