What New Research Shows
Scientists have long noticed something curious: people who live at high altitudes - think the Andes, the Tibetan Plateau, or the peaks of the Rockies - have consistently lower rates of diabetes than those at sea level. It's a pattern that has appeared in the data for years, without a satisfying explanation. A study published in February 2026 may finally have found one.
The short version? When oxygen gets thin, red blood cells quietly become sponges for glucose - soaking up blood sugar in a way that protects against the conditions that drive diabetes. If that mechanism can eventually be harnessed in a drug, it could open an entirely new route to treating the condition.
There's a caveat to flag upfront: this research was conducted in mouse models, not humans. The findings are genuinely exciting, but they are early-stage and need to be replicated in human studies before drawing clinical conclusions. That matters - especially given how often preliminary research gets overstated.
Why this matters in Britain
Diabetes is one of the most pressing health challenges in the UK right now. According to Diabetes UK, more than five million people in Britain are estimated to be living with diabetes - an all-time high. Almost 4.6 million carry a formal diagnosis, and a further 1.3 million people are thought to be living with undiagnosed type 2 diabetes, unaware of it.
Around 90% of diagnoses are type 2, a form closely linked to blood sugar regulation, lifestyle factors, and genetics. Diabetes UK also estimates that 6.3 million adults in the UK have blood sugar levels in the pre-diabetic range - elevated enough to indicate risk, but not yet at diagnosis threshold. Understanding the biological mechanisms that regulate blood sugar is, in that context, research with very direct relevance to millions of people across Britain.
What the researchers found
The research team induced hypoxia - low oxygen conditions that mimic high altitude - in mice and watched what happened to their blood sugar. The animals' glucose levels dropped sharply. When the researchers gave sugar to the mice, it disappeared from the bloodstream almost instantly. But here's the puzzle: it hadn't gone to the muscle, the brain, or the liver - any of the usual places glucose ends up.
"When we gave sugar to the mice in hypoxia, it disappeared from their bloodstream almost instantly," said the author of the study. "We looked at muscle, brain, liver - all the usual suspects - but nothing in these organs could explain what was happening."
Using different imaging techniques, the team eventually identified the missing piece: red blood cells had been absorbing the glucose. That was unexpected, because red blood cells have long been considered metabolically simple - passive carriers of oxygen, not active metabolic participants.
Red blood cells: a hidden glucose sink
Under low-oxygen conditions, the study found, red blood cells shifted their metabolism to absorb significantly more glucose from the bloodstream. This appears to serve a dual purpose: the glucose fuels a process that helps red blood cells release oxygen more efficiently to tissues when oxygen is scarce - but it also has the side effect of pulling blood sugar down.
The author of the study said “Red blood cells are usually thought of as passive oxygen carriers. Yet, we found that they can account for a substantial fraction of whole-body glucose consumption, especially under hypoxia."
One particular molecule was identified as central to the mechanism, acting on haemoglobin - the oxygen-carrying protein in red blood cells - and loosening its grip on oxygen, improving circulation to tissues. Red blood cells were described by the team as "a hidden compartment of glucose metabolism that has not been appreciated until now."
Notably, the blood-sugar-lowering effect persisted for weeks to months after the mice returned to normal oxygen environments - not just while they were in low-oxygen conditions.
What this could mean for diabetes treatment
The most immediately promising element of the research is what happened when the team tested a newly developed drug designed to mimic the metabolic effects of high-altitude living. In mouse models of both type 1 and type 2 diabetes, the drug completely reversed high blood sugar levels - and the Gladstone press release notes it performed better than existing medications in these models.
That is a striking result, though it bears repeating: this is in mice, and drugs that work in mouse models frequently fail to translate to humans. The path from a promising mouse study to an approved treatment is long, expensive, and uncertain. But the finding does point to a genuinely novel therapeutic approach - recruiting red blood cells as glucose regulators rather than targeting insulin pathways, which is how most current diabetes drugs work.
The research also offers a tentative explanation for why Sherpas - people of Tibetan heritage who have lived at high altitude for generations - have historically not shown the blood-sugar-lowering effects seen in other high-altitude populations. The hypothesis is that genetic adaptations in Sherpa populations may prevent them from producing the same kind of glucose-absorbing red blood cells, having evolved a different set of compensatory mechanisms instead.
Checking your blood sugar at home
If you do have any concern for Diabetes or you blood sugar levels, our Newfoundland Diabetes (HbA1c) Test offers a convenient way to check your HbA1c - a marker that reflects average blood sugar levels over the preceding two to three months - from home, without a clinic appointment.
The bottom line
This is a genuinely interesting piece of science - one that reframes red blood cells as active metabolic participants rather than simple oxygen taxis. But it's early-stage animal research, and the gap between a mouse model and a treatment available at your GP is considerable.
What it does reinforce is something well established: blood sugar regulation is complex, influenced by factors ranging from genetics and lifestyle to, apparently, the altitude at which you live.