Diabetes directly causes roughly 1.6 million deaths worldwide each year, according to 2021 data from the World Health Organization. In the United States alone, diabetes was listed on 94,445 death certificates as the underlying cause, making it the seventh leading cause of death with a rate of 27.8 deaths per 100,000 people.
Those numbers, however, almost certainly undercount the true toll. Diabetes dramatically raises the risk of heart attack, stroke, kidney failure, and infection. When someone with diabetes dies of a heart attack, the death certificate often lists heart disease, not diabetes. The real number of deaths where diabetes played a significant role is likely two to three times higher than official figures suggest.
Why the Official Count Is Misleading
Death certificates have a single line for the “underlying cause of death.” When a person with poorly controlled blood sugar develops heart disease and dies of a cardiac event, the certifying physician typically writes heart disease as the cause. Diabetes may appear as a contributing factor, or it may not appear at all. This coding system means the 1.6 million global figure and the 94,445 U.S. figure capture only deaths where diabetes itself, such as dangerously high or low blood sugar, was considered the primary reason the person died.
Cardiovascular disease is the leading killer of people with diabetes, and a large share of those cardiovascular deaths would never have occurred without the metabolic damage diabetes causes over years. That makes diabetes one of the most undercounted causes of death in public health statistics.
Who Is Most at Risk
Diabetes does not kill equally across populations. Among Americans 65 and older, the age-adjusted death rate from diabetes varies dramatically by race and ethnicity. American Indian and Alaska Native adults face the highest rate at 913.6 per 100,000, nearly double the rate for white adults (493.3 per 100,000). Black adults are close behind at 884.1, followed by Native Hawaiian and Pacific Islander adults at 835.4 and Hispanic adults at 778.5. Asian Americans have the lowest rate at 457.7 per 100,000.
These gaps reflect compounding disadvantages: less access to preventive care, higher rates of food insecurity, fewer opportunities for the kind of consistent medical management that keeps diabetes from progressing, and in some cases, genetic susceptibility that interacts with environmental factors.
Type 1 vs. Type 2 Mortality
Both types of diabetes shorten life expectancy, but the patterns differ by age and sex. A large population study from England and Wales found that type 2 diabetes diagnosed during adolescence is associated with roughly 12 years of lost life expectancy, while type 1 diabetes diagnosed between ages 21 and 30 costs about 10 years.
For younger adults between 20 and 39, the mortality rates tell a striking story. Women with type 1 diabetes in that age range died at a rate of 1.4 per 1,000 person-years, and women with type 2 at 1.6 per 1,000. Both figures are about three to four times higher than the 0.4 per 1,000 rate for women of the same age in the general population. Among men aged 20 to 39, those with type 1 diabetes had a mortality rate of 2.6 per 1,000 person-years compared to 1.9 for type 2 and just 0.8 for the general male population.
The takeaway: a diabetes diagnosis at a young age, regardless of type, roughly triples the risk of dying in early adulthood compared to peers without the disease.
Acute Complications Still Kill
Most diabetes deaths happen slowly, through years of cardiovascular and organ damage. But acute crises, particularly diabetic ketoacidosis (DKA), still claim lives. DKA occurs when the body starts breaking down fat too rapidly, flooding the blood with acids. It is most common in type 1 diabetes but can affect people with type 2 as well.
Hospital deaths from DKA have declined significantly over the past two decades. The in-hospital fatality rate dropped from 1.1% in 2000 to 0.4% by 2014, with about 620 in-hospital DKA deaths recorded that year. Better emergency protocols and faster recognition have helped, but DKA remains dangerous when treatment is delayed, particularly for people who don’t yet know they have diabetes.
Long-Term Trends in the U.S.
Looking at the broader arc, age-adjusted diabetes mortality in the United States has been remarkably flat over five decades. Between 1968 and 2022, the age-adjusted mortality rate decreased by just 4.7%, a nearly negligible annual change. That stagnation stands in contrast to dramatic improvements in death rates from heart disease and cancer over the same period. The number of Americans living with diabetes has surged during those decades, and while medical advances have kept people alive longer, the sheer growth of the diabetic population has offset those gains in the overall death count.
The practical reality: better medications and monitoring tools have improved individual outcomes, but the diabetes epidemic is growing faster than treatment can keep pace with. Prevention, particularly through weight management, physical activity, and early screening, remains the most effective way to reduce the death toll.