Using an Air Purifier at Night May Help Stabilize Blood Sugar in People With Prediabetes

Installing HEPA filters offers an easy, low-cost tool to help protect heart and metabolic health, according to Sharine L. Wittkopp, MD, PhD, lead study author and a cardiologist at NYU Langone.

Running an air purifier in the bedroom overnight can reduce daily blood sugar swings by nearly 8% in adults with prediabetes. The findings come from a study presented at the American Heart Association’s Scientific Sessions 2026 in Chicago.

Key Clinical Takeaways:
• Participants using active HEPA filters experienced an 8% drop in daily blood sugar swings and a 17% reduction in total post-breakfast glucose.
• The randomized trial tracked 150 adults with prediabetes over one month using continuous glucose monitors.
• Researchers note that indoor fine-particle levels fell by 36% in rooms equipped with functioning filters.

The study evaluated 150 men and women diagnosed with prediabetes who did not have atherosclerosis. Participants were split into two groups in New York City, with half sleeping using real portable air cleaners and the other half using sham filters for about a month.

Indoor fine-particle concentrations fell 36% in rooms running active filters. Participants wore continuous glucose monitors for one week before the trial and again after four weeks to track metabolic changes.

Air pollution can interfere with insulin receptor signaling in liver, muscle, and fat tissue, blunting the cellular response to insulin. Cleaner air helps the body manage blood sugar more effectively, explained Richard Siegel, MD, endocrinologist at the Tufts Medicine Weight & Wellness Center–Stoneham and co-director of the Diabetes and Lipid Center at Tufts Medical Center.

Large daily blood sugar swings are associated with faster progression to full diabetes in people with prediabetes. Elevated glycemic variability is associated with worse cardiovascular outcomes, independent of average glucose levels.

The peer-reviewed study has not yet been published. Full trial details are available at ClinicalTrials.gov under identifier NCT05994937.

According to doctors, cleaner indoor air has the potential to help everyone with blood sugar management. Alongside prescribed medications, regular exercise, and nutritious eating, setting up HEPA filters provides a simple and affordable method to safeguard metabolic and cardiac well-being, as pointed out by Wittkopp.

Disclaimer: The information provided in this article is for educational and scientific communication purposes only and does not constitute medical advice.