Infections are hiding in plain sight, common and preventable yet mostly absent from guidelines.
A large-scale study tracking more than 800,000 people across England has confirmed what clinical medicine has long overlooked: infections are killing diabetics at rates far exceeding what current guidelines acknowledge, ranking as the third leading cause of death in type 2 diabetes. The research, presented at the American Diabetes Association conference in New Orleans, reveals that even people with prediabetes face meaningfully elevated risk, and that blood sugar variability — not just average levels — predicts who is most vulnerable. In a condition defined by its complexity, this finding asks a humbling question: how much preventable suffering accumulates in the space between what science knows and what guidelines say?
- Infections kill type 2 diabetics at a rate that places them third among all causes of death — behind only cardiovascular disease and cancer — yet they are barely mentioned in the clinical guidelines doctors rely on.
- People with type 1 diabetes face a 337% higher risk of infection-related hospitalization than non-diabetics, while even those with prediabetes carry a 33–35% elevated risk, suggesting the danger spans the entire diabetes spectrum.
- A critical discovery upends standard care assumptions: it is not average blood sugar that best predicts serious infection risk in type 2 diabetes, but the swings between readings — meaning patients who appear well-controlled may still be in significant danger.
- Pneumonia and sepsis are the infections most likely to hospitalize or kill diabetics, making these common, often preventable conditions the quiet engines of a largely unacknowledged mortality crisis.
- Researchers are now pressing for sweeping guideline reforms across the UK, Europe, and the United States — demanding that infection prevention, early recognition, and rapid care access become as central to diabetes management as blood sugar control itself.
A study of more than 800,000 people in England has exposed a striking blind spot in diabetes care: infections are the third leading cause of death in type 2 diabetes, yet they remain largely absent from the clinical guidelines that shape how the condition is treated. The research, published in the journal Diabetes and presented at the American Diabetes Association conference in New Orleans, was led by researchers at City St George's, University of London.
Tracking three groups — over 33,000 people with type 1 diabetes, more than 527,000 with type 2, and 273,000 with prediabetes — against more than one million matched controls over five years, the study revealed a clear hierarchy of risk. Type 1 diabetics faced an 81% higher chance of infection managed in primary care and a 337% higher risk of hospitalization. Type 2 diabetics showed 51% and 91% elevated risks respectively. Even those with prediabetes were not spared, facing risks 33–35% above the general population.
The most dangerous infections were lower respiratory illnesses, particularly pneumonia, which drove hospital admissions across both type 1 and type 2 patients. When infections proved fatal in type 2 diabetes, sepsis and respiratory disease were most often responsible — common conditions, frequently preventable, and largely invisible in clinical guidance.
Perhaps the most unsettling finding concerned blood sugar control itself. The research found that in type 2 diabetes, it is not average glucose levels but their variability — the swings between readings — that most strongly predicts serious infection risk. Patients whose numbers fluctuate widely, even if their average appears acceptable, may face considerable danger they and their doctors do not recognize.
Professor Julia Critchley, who led the study, described infections as 'hiding in plain sight.' Her team is now calling for global guideline reforms that would place infection prevention, early recognition, and rapid clinical response alongside blood sugar management as foundational pillars of diabetes care — a shift they argue is long overdue as the number of people living with diabetes continues to rise worldwide.
A sweeping study of more than 800,000 people across England has surfaced something that should have been obvious all along: infections kill diabetics at rates that dwarf what current medical guidelines acknowledge. The research, published this week in the journal Diabetes and presented at the American Diabetes Association conference in New Orleans, reveals that infection ranks as the third leading cause of death in type 2 diabetes—trailing only cardiovascular disease and cancer—yet remains conspicuously absent from most clinical guidance documents that shape how doctors treat the condition.
The scale of the disparity is stark. Researchers at City St George's, University of London, tracked infection rates across three groups: 33,829 people with type 1 diabetes, 527,151 with type 2 diabetes, and 273,216 with prediabetes, comparing each cohort to more than one million matched controls over five years. What emerged was a hierarchy of risk. People with type 1 diabetes faced an 81 percent higher chance of infection managed in primary care and a staggering 337 percent higher risk of hospitalization for infection. Those with type 2 diabetes showed a 51 percent increased risk for primary care infections and 91 percent for hospitalization. Even people with prediabetes—often considered a precursor condition rather than a disease itself—faced 35 percent and 33 percent elevated risks, respectively.
The infections themselves tend toward the serious. Lower respiratory tract infections, particularly pneumonia, emerged as the most common reason type 1 and type 2 diabetics required hospital admission. When infection became fatal in type 2 diabetes patients, sepsis and lower respiratory infections were the culprits. These are not rare complications or edge cases. They are common, preventable in many instances, and largely invisible in the guidelines that structure diabetes care.
What makes the finding more unsettling is the discovery about blood sugar control. Doctors have long focused on average blood sugar levels as the primary metric of good diabetes management. The new research suggests this approach misses something crucial, at least in type 2 diabetes. It is not the average level alone that predicts infection risk—it is the variation. A patient whose blood sugar swings wildly from visit to visit, even if the average falls within acceptable range, faces elevated risk of serious infection requiring hospitalization. This means some people who believe their diabetes is well-controlled may actually be at considerable danger.
Professor Julia Critchley, who led the research, framed the oversight bluntly. Infections, she said, are "hiding in plain sight." They are common, serious, and often preventable, yet they barely register in the clinical documents that guide treatment. With the global population of diabetics rising steeply, she argued, it is a disservice to patients not to treat infection risk as a core component of care rather than an afterthought.
The researchers are now calling for a fundamental shift in how diabetes is managed. They want infection prevention, early recognition, and management embedded in guidelines across the UK, Europe, and the United States. This would mean explicit attention to infection risk in clinical documents, stronger messaging to patients about when to seek care, and changes to primary care systems so that diabetics are prioritized for rapid assessment when symptoms appear. The goal is straightforward: reduce preventable hospitalizations and deaths by making infection as central to diabetes management as blood sugar control itself.
Notable Quotes
Infections are a major health hazard across the diabetes spectrum and are hiding in plain sight. They are common, serious, and often preventable, yet they are mostly absent from clinical guidelines.— Professor Julia Critchley, City St George's, University of London
It's a disservice if we do not treat infection risk as a core part of diabetes care. It cannot be an afterthought.— Professor Julia Critchley
The Hearth Conversation Another angle on the story
Why has infection risk been overlooked for so long in diabetes care?
Because the field has been laser-focused on cardiovascular disease and metabolic control. Those are real threats, and they dominate the guidelines. But when you actually count deaths, infections are right there in the top three. It's a blind spot born of habit.
The blood sugar fluctuation finding seems to upend the standard advice about "good control."
Exactly. A patient might check their blood sugar at clinic visits and see acceptable numbers, feel reassured, and never know they're at risk. But if those numbers are bouncing around between visits, the immune system is under stress. It's a hidden instability.
What would change if these guidelines were updated?
Doctors would screen for infection risk more actively. Patients would get clearer warnings about symptoms to watch for. Primary care systems would triage diabetics faster. It sounds simple, but it could prevent a lot of unnecessary hospitalizations.
Is this a problem unique to type 1 and type 2, or does it extend further?
It spans the whole spectrum. Even prediabetes shows elevated risk. That's striking because prediabetes is often treated as a warning rather than a condition requiring active management. This study suggests it warrants more attention.
How large was this study relative to others in the field?
One of the largest to date. Over 800,000 people with diabetes tracked against a million matched controls over five years. That's not a small sample. The findings carry real weight.