How Many People in the World Have Type 2 Diabetes?

Roughly 460 to 500 million people worldwide currently have type 2 diabetes, making it one of the most common chronic diseases on the planet. The exact figure depends on which estimate you use, because global diabetes tallies typically lump type 1 and type 2 together, and type 2 accounts for about 90 to 95 percent of all cases. Whatever number you land on, it has more than doubled since the 1990s and shows no sign of leveling off. What makes the picture even harder to pin down is that close to half of all people with diabetes have never been diagnosed, so the true burden is larger than any official count suggests.

What the Latest Global Estimates Say

Several major research efforts track diabetes worldwide, and their headline numbers differ because they use different age cutoffs, data sources, and modeling approaches. In 2017, an analysis of the Global Burden of Disease data put the number of people specifically with type 2 diabetes at about 462 million, or roughly 6.3 percent of the world’s population.¹ That figure has climbed substantially since. The International Diabetes Federation’s 11th Diabetes Atlas, published in 2025 using 2024 data, estimates that about 589 million adults aged 20 to 79 now have diabetes of all types, which works out to about 11 percent of the global adult population.² Since type 2 makes up the vast majority, that puts the type 2 count somewhere north of 500 million adults.

A separate pooled analysis of more than 1,100 population-representative studies, published in The Lancet, arrived at a larger figure: about 828 million adults with diabetes worldwide in 2022, an increase of roughly 630 million from 1990.³ The gap between that number and the IDF’s 589 million largely comes down to methodology: the Lancet analysis used a broader age range (18 and older) and different diagnostic thresholds. These aren’t contradictory estimates so much as different ways of measuring the same crisis. What every source agrees on is the trajectory: the number keeps rising fast, and by 2050, projections suggest the global diabetes count could reach 850 million or more.²

Nearly Half of All Cases Go Undiagnosed

One of the most striking things about global diabetes numbers is how many people are walking around with the condition and have no idea. In 2024, about 43 percent of adults with diabetes worldwide were undiagnosed, which translates to roughly 252 million people.⁴ That fraction has improved slightly from earlier estimates, which put undiagnosed cases at about 46 percent globally.⁵ But the improvement is uneven.

Income is the strongest predictor of whether someone gets a diagnosis. In low-income countries, about 59 percent of people with diabetes are undiagnosed. In high-income countries, that figure drops to about 29 percent.⁴ The range across individual countries is even more dramatic, spanning from about 16 percent undiagnosed in Colombia to over 90 percent in Burkina Faso. Africa as a region had the highest proportion of undiagnosed diabetes at about 73 percent, while North America and the Caribbean had the lowest at roughly 29 percent.⁴

This matters because undiagnosed diabetes is untreated diabetes. Years of elevated blood sugar silently damage blood vessels, nerves, kidneys, and eyes. By the time someone is finally diagnosed, complications may already be advanced. The sheer scale of undiagnosed cases also means that official prevalence figures undercount the real burden, particularly in the parts of the world where it is growing fastest.

Where in the World Rates Are Highest

Type 2 diabetes does not spread evenly across the globe. The Middle East, North Africa, South Asia, and the Pacific Islands consistently report the highest prevalence rates. Some Pacific island nations have adult diabetes prevalence above 20 percent. Meanwhile, much of Sub-Saharan Africa has historically had lower prevalence, though rates there are rising rapidly, driven by urbanization and changing diets.

Even within a single continent, the variation is substantial. In Europe, the odds of a new diabetes diagnosis are roughly twice as high in Eastern Europe as in Western Europe, and about 1.8 times as high in Southern Europe compared to the West. Part of that gap is explained by differences in healthcare systems rather than biology alone.⁶

Within individual countries, urban-rural gaps are a recurring pattern. A large study across communities in low-, middle-, and high-income countries found that living in an urban area raised the odds of diabetes by about 24 percent after adjusting for other factors.⁷ In India, for example, diabetes prevalence in urban areas was about 18 percent versus roughly 10 percent in rural areas.⁸ Cities bring more sedentary occupations, easier access to processed food, and less day-to-day physical activity. In many low- and middle-income countries, the nutrition transition from traditional diets toward refined carbohydrates, added sweeteners, and processed oils is happening fastest in urban centers.

Who Is Most Affected

Age is the single strongest demographic risk factor. In the Global Burden of Disease data, prevalence rose steeply with each decade of life: roughly 4 percent of people aged 15 to 49 had type 2 diabetes, compared with about 15 percent of those aged 50 to 69 and 22 percent of those 70 and older.¹ Because the world’s population is aging overall, this age gradient alone guarantees rising numbers even if no other risk factors changed.

Sex also matters, though the pattern is more nuanced. Worldwide, an estimated 17.7 million more men than women have diabetes. Men tend to be diagnosed at a younger age and at a lower body fat level, suggesting that male physiology may have a lower threshold before insulin resistance takes hold. Women, on the other hand, tend to carry a heavier burden of risk factors, especially obesity, by the time they are diagnosed. Psychosocial stress also appears to play a larger role in women’s diabetes risk.⁹

Family history is another powerful risk factor. In the large multi-country PURE study, having a family history of diabetes tripled the odds of having the condition. Waist-to-hip ratio and body mass index were similarly strong predictors, with the highest-risk groups facing roughly two to four times the odds compared to the leanest groups.⁷ Certain ethnic and regional populations, including South Asians, are predisposed to developing diabetes at lower body weights, due to a combination of genetic and metabolic factors that are amplified by lifestyle changes.¹⁰

Rising Cases in Children and Teenagers

Type 2 diabetes used to be called “adult-onset diabetes” for good reason: it was essentially unheard of in young people. That has changed. In the U.S., data from the SEARCH for Diabetes in Youth study shows that the prevalence of type 2 diabetes among youth roughly doubled between 2001 and 2017, with an annual rate of increase that actually accelerated in the later years of that period.¹¹ In Canada, the prevalence among young people more than doubled over roughly a decade, with the annual percentage increase close to 8 percent per year.¹²

These are still small numbers in absolute terms compared to adult diabetes, but the growth rate is alarming. Youth-onset type 2 diabetes tends to progress more aggressively than the adult form, with faster loss of insulin-producing beta cell function and earlier onset of complications. A teenager diagnosed at 15 faces decades of disease management, with cumulative organ damage that can start before they reach middle age. The rise in pediatric type 2 diabetes also mirrors the rise in childhood obesity, and the two trends are tightly linked.¹³

What Is Driving the Global Increase

The worldwide surge in type 2 diabetes is not a mystery. It tracks closely with what researchers call the nutrition transition: a shift from traditional diets built around whole grains, legumes, and vegetables toward diets heavy in refined carbohydrates, added sugars, processed oils, and animal-source foods. That dietary shift is happening fastest in low- and middle-income countries, where the modern food system, including supermarkets, fast food chains, and packaged snacks, is expanding rapidly.¹⁴ At the same time, physical activity is declining as economies shift from agricultural and manual labor to service and office-based work.

The result is rising body weight nearly everywhere. Most countries are seeing increases in BMI and waist circumference, and those two measures are among the strongest individual predictors of type 2 diabetes risk. But the driver isn’t just individual behavior. Agricultural subsidies, food industry practices, urban design that discourages walking, and the global spread of ultra-processed food are all structural forces that shape what people eat and how much they move. In low- and middle-income regions, the burden attributable to dietary risks is climbing especially fast, while healthcare infrastructure struggles to keep pace.¹⁵

Air Pollution as a Less Obvious Risk Factor

Most people associate type 2 diabetes with diet, weight, and genetics. Fewer know that air quality plays a measurable role. Fine particulate matter (PM2.5) has been linked to diabetes in studies from multiple countries. In the U.S., a county-level analysis found that diabetes prevalence increased by about one percentage point for every 10 micrograms-per-cubic-meter rise in PM2.5 exposure, even after controlling for other risk factors like obesity and physical inactivity. Counties with the highest PM2.5 levels within EPA guidelines still showed more than a 20 percent increase in diabetes prevalence compared to those with the lowest levels.¹⁶

A large cohort study from China confirmed a similar relationship, finding that each standard-deviation increase in three-year average PM2.5 concentration was associated with about 8 percent higher odds of diabetes. The association was strongest in adults 65 and older.¹⁷ Globally, the disease burden from type 2 diabetes attributable to ambient particulate matter pollution has been on an upward trajectory, with the steepest increases in Africa, Asia, and low-to-middle-income regions.¹⁸

The biological mechanism likely involves chronic inflammation and oxidative stress triggered by inhaled fine particles, which can impair insulin signaling. This does not mean air pollution is as important as diet or weight, but in heavily polluted cities, it may be adding meaningfully to diabetes risk in ways public health messaging rarely acknowledges.

The Death Toll and Economic Cost

Type 2 diabetes is not just common; it is deadly and expensive. Globally, deaths attributed to type 2 diabetes climbed from about 606,000 in 1990 to nearly 1.5 million in 2019.¹⁹ That figure underestimates the true toll because diabetes dramatically raises the risk of heart attack, stroke, kidney failure, and infection, and those deaths are often coded to the immediate cause rather than the underlying diabetes.

The economic burden is staggering. The total global cost of diabetes in adults was estimated at about $1.3 trillion in 2015 and is projected to reach roughly $2.2 trillion by 2030, which would represent more than 2 percent of global GDP.²⁰ That figure includes direct healthcare spending (medications, hospitalizations, dialysis, amputations) and indirect costs from lost productivity and disability. For low- and middle-income countries, where both prevalence and undiagnosed rates are climbing fastest, the economic strain threatens to overwhelm already stretched health systems.

Can Type 2 Diabetes Be Reversed

Amid all the bleak numbers, there is a counterpoint worth noting: type 2 diabetes can go into remission. The most dramatic evidence comes from bariatric surgery. A population-based study in the United Kingdom found that people with type 2 diabetes who underwent bariatric surgery had about 18 times the rate of remission compared to matched controls who did not have surgery. The effect was most pronounced for gastric bypass, which showed roughly a 43-fold increase in remission rates, followed by sleeve gastrectomy and gastric banding.²¹ Blood sugar, BMI, and triglyceride levels all dropped sharply in the first two years after surgery.

Bariatric surgery is not a realistic population-level solution for hundreds of millions of people, of course. But dietary interventions that achieve substantial weight loss have also produced remission in clinical trials, particularly when started within a few years of diagnosis. The existence of remission challenges the common assumption that type 2 diabetes is a permanent, irreversible condition once it develops. For individuals, that is genuinely encouraging. For public health planners, the more relevant question is whether prevention and early intervention at scale can slow the trajectory of the pandemic itself, and on that front, the global numbers so far are not encouraging. The IDF projects that by 2050, prevalence among adults could reach about 13 percent, or 853 million people.² Separate estimates for type 2 diabetes specifically put the projected prevalence at roughly 10 to 12 percent of the entire global population by mid-century.²²

Why the Numbers Are Hard to Compare

If you have spent any time looking up global diabetes statistics, you have probably noticed that different sources give different numbers, sometimes wildly so. The IDF says 589 million in 2024. The Lancet analysis says 828 million in 2022. Older Global Burden of Disease papers say 462 million for type 2 alone in 2017. Some of this is simply the disease getting more common year by year, but a lot of it comes down to methodological choices that are invisible unless you dig into the fine print.

Age range is a big one. The IDF restricts its estimates to adults aged 20 to 79. The Lancet analysis included everyone 18 and older. Since diabetes prevalence rises steeply with age, and many people over 79 have it, excluding them lowers the total. Diagnostic criteria also vary: some studies use fasting blood glucose alone, others include oral glucose tolerance tests or hemoglobin A1c, and each test catches a slightly different slice of the population. Countries differ in which tests they routinely use, and some regions have very little screening data at all, meaning modelers have to extrapolate from small or outdated surveys.

None of this means the numbers are unreliable. It means you should treat any single estimate as a reasonable approximation rather than an exact headcount. The consistent finding across every major analysis is the same: type 2 diabetes now affects somewhere between 400 and 600 million people depending on how you draw the boundaries, the number has roughly quadrupled since 1990, and it is projected to keep climbing for at least another generation.

1
PubMed Central. Epidemiology of Type 2 Diabetes – Global Burden of Disease and Forecasted Trends
2
PubMed. 11th edition of the IDF Diabetes Atlas: global, regional, and national diabetes prevalence estimates for 2024 and projections for 2050
3
The Lancet. Worldwide trends in diabetes prevalence and treatment from 1990 to 2022: a pooled analysis of 1108 population-representative studies with 141 million participants
4
Diabetes Care. Global, Regional, and National Estimates of Undiagnosed Diabetes in Adults: Findings From the 2025 IDF Diabetes Atlas
5
PubMed. Global estimates of undiagnosed diabetes in adults
6
PubMed. Regional differences in diabetes across Europe – regression and causal forest analyses
7
Diabetes Care. Variations in Diabetes Prevalence in Low-, Middle-, and High-Income Countries: Results From the Prospective Urban and Rural Epidemiological Study
8
PubMed Central. Urban–Rural Differences in the Prevalence of Diabetes Among Adults in Haryana, India: The ICMR-INDIAB Study (ICMR-INDIAB-18)
9
PubMed Central. Sex differences in type 2 diabetes
10
PubMed Central. Diabetes and associated complications in the South Asian population
11
Diabetes Care. Youth-Onset Type 2 Diabetes: The Epidemiology of an Awakening Epidemic
12
PubMed. Incidence and prevalence trends of youth-onset type 2 diabetes in a cohort of Canadian youth: 2002-2013
13
PubMed Central. Rising tide: The global surge of type 2 diabetes in children and adolescents demands action now
14
PubMed Central. Nutrition Transition and the Global Diabetes Epidemic
15
PubMed Central. Global burden of Type 2 Diabetes Mellitus attributable to dietary risks in elderly adults: insights from the Global Burden of Disease study 2021
16
PubMed Central. Association between fine particulate matter and diabetes prevalence in the U.S.
17
Diabetes Care. Long-term Exposure to Ambient PM2.5 and Its Components Associated With Diabetes: Evidence From a Large Population-Based Cohort From China
18
PubMed Central. Type 2 diabetes attributable to ambient particulate matter pollution: a global burden study from 1990 to 2019
19
PubMed Central. Type 1 and type 2 diabetes mortality burden: Predictions for 2030 based on Bayesian age‐period‐cohort analysis of China and global mortality burden from 1990 to 2019
20
Diabetes Care. Global Economic Burden of Diabetes in Adults: Projections From 2015 to 2030
21
JAMA Surgery. Remission of Type 2 Diabetes Mellitus in Patients After Different Types of Bariatric Surgery: A Population-Based Cohort Study in the United Kingdom
22
Global Drug Design & Development Review. Global Prevalence and Mortality of Type-2 Diabetes from 1990 to 2019, with Future Projections to 2023 and 2050: a Systematic Review