High Altitude & Diabetes: How Red Blood Cells Lower Blood Sugar | New Study

Recent experimental studies are shedding light on the lower prevalence of diabetes among individuals living at high altitude. Data obtained from animal models highlight biological mechanisms that could underpin future therapeutic strategies.

A study, conducted by researchers at the Gladstone Institutes in San Francisco and published on February 21, 2026, in the journal Cell Metabolism, shows that in low-oxygen conditions, similar to those found at high altitude, red blood cells alter their metabolism and absorb more glucose from the bloodstream. The authors describe these cells as a “glucose sink”—a structure that takes up and utilizes large amounts of glucose from circulation.

The findings, obtained in animal models, indicate biological mechanisms that could guide the development of novel therapeutic approaches in the future. For years, researchers have observed a correlation between high-elevation living and reduced diabetes rates, but the underlying reasons remained unclear.

At high altitude, the increased capacity to transport glucose provides red blood cells with additional energy to deliver oxygen more efficiently throughout the body. According to the report, this process has the beneficial side effect of lowering blood sugar levels.

In previous experiments, the team observed that mice breathing air with a low concentration of oxygen had significantly lower blood glucose levels than normal. When sugar was administered, glucose almost immediately disappeared from these animals’ blood. Analyses performed on the muscles, brain, and liver did not explain the phenomenon.

the researchers identified red blood cells as the primary glucose capture compartment, a structure capable of taking up and utilizing significant amounts of glucose from circulation.

Under hypoxic conditions, the mice produced a significantly higher number of red blood cells, and each cell absorbed more glucose compared to those formed under normal oxygen conditions.

The team then tested an experimental drug, called HypoxyStat, designed to mimic the effects of low oxygen by increasing hemoglobin’s affinity for oxygen, which limits its release to tissues. In mice with diabetes, the drug completely normalized blood glucose, according to the authors, demonstrating a superior effect to existing medications. The substance is not yet approved for clinical use.

The authors believe the results open the possibility of a different approach to diabetes treatment, by utilizing red blood cells as a mechanism for capturing glucose from the blood.

This discovery builds upon long-standing observations that people living at high altitudes have lower rates of diabetes. In the United States, individuals living 1,500 meters (4,920 feet) above sea level are 12 percent less likely to have diabetes than those living at altitudes below 500 meters (1,640 feet). The precise cause of this relationship has been a mystery, but this research offers a compelling explanation.

The study highlights a previously underappreciated role for red blood cells in glucose metabolism. Traditionally, red blood cells were considered relatively simple cells with limited metabolic flexibility. However, this research demonstrates that they can adapt to low-oxygen environments by shifting their metabolism to absorb glucose.

“Red blood cells represent a hidden compartment of glucose metabolism that has not been appreciated until now,” said Isha Jain, PhD, Gladstone Investigator and senior author of the study. “This discovery could open up entirely new ways to think about controlling blood sugar.”

The researchers found that red blood cells “born in hypoxia are special, as they possess more glucose transporters than regular blood cells,” explained Yolanda Martí-Mateos, the postdoctoral scholar from Gladstone Institutes who led the study. These glucose transporters are proteins that facilitate the movement of glucose across the cell membrane, allowing the red blood cells to absorb more sugar from the bloodstream.

The potential implications of this research extend beyond diabetes. Understanding how red blood cells regulate glucose metabolism could also inform the development of treatments for other metabolic disorders. The HypoxyStat drug, while still in early stages of development, offers a promising avenue for therapeutic intervention.

While the study was conducted in mice, the researchers are optimistic that the findings will translate to humans. Further research is needed to confirm these results and to investigate the safety and efficacy of HypoxyStat in clinical trials. The team hopes this work will serve as a “proof of concept” that will inspire new diabetes treatments.

It’s important to note that this research does not suggest that simply moving to a high altitude is a cure for diabetes. The complex interplay of factors contributing to diabetes development requires a comprehensive approach to prevention and management, including lifestyle modifications and, when necessary, medical intervention. However, this study provides a valuable new insight into the biological mechanisms that may protect against the disease and offers a potential target for future therapies.