The people most likely to get diabetes are those with a combination of risk factors: excess body weight, a family history of the disease, age over 45, limited physical activity, and membership in certain racial or ethnic groups with higher genetic susceptibility. No single factor guarantees a diagnosis, but the more risk factors you carry, the higher your probability climbs. Because type 1, type 2, and gestational diabetes have different causes, the profile of a high-risk person looks different for each.
Weight, Age, and Physical Activity
Carrying extra weight is the single most influential modifiable risk factor for type 2 diabetes. A BMI of 25 or higher puts you into a higher-risk category, and for Asian Americans, that threshold drops to 23. Excess body fat, particularly around the midsection, makes your cells less responsive to insulin. Over time, your pancreas can’t keep up with the demand, and blood sugar stays elevated.
Age compounds the risk. After 45, your likelihood of developing type 2 diabetes rises steadily, which is why routine screening is recommended for all adults starting at age 35. But younger adults aren’t immune. If you’re overweight and have even one additional risk factor, such as a parent with diabetes or high blood pressure, screening guidelines say testing should start regardless of age.
Being physically active fewer than three times a week independently raises your risk. Exercise helps your muscles absorb glucose from the bloodstream without needing as much insulin, so a sedentary lifestyle gradually shifts your metabolism in the wrong direction.
Race, Ethnicity, and the Numbers
Diabetes does not affect all racial and ethnic groups equally. Between 2020 and 2024, Native Hawaiian and Pacific Islander adults had the highest diabetes prevalence in the United States at 20.65%, roughly one in five. Asian Americans followed at 15.24%, American Indian and Alaska Native populations at 14.85%, and Black Americans at 14.19%. Hispanic and Latino adults had a prevalence of 12.67%, while white adults had the lowest rate at 11.74%.
These gaps reflect a mix of genetic susceptibility, differences in access to healthcare and healthy food, and the cumulative effects of socioeconomic disadvantage. The disparities are persistent and well documented across decades of public health data.
Family History and Genetics
Having a parent or sibling with type 2 diabetes significantly increases your own risk. The effect is strong enough that it’s listed as a standalone screening criterion: if a first-degree relative has been diagnosed, you should be tested even if you have no symptoms.
For type 1 diabetes, genetics play an even more specific role. About 40% to 50% of the inherited risk comes from a particular region of your immune system’s genetic code. Children born into a family where someone already has type 1 diabetes face roughly a 5% chance of developing it by age 20, compared to 0.3% for children with no family history. For children who carry the highest-risk genetic combination and also have an affected sibling, the risk climbs to around 55%.
Type 1 diabetes also appears to involve environmental triggers. Viral infections, particularly a group of common gut viruses called enteroviruses, are the leading suspects. Rotavirus has also been implicated. The working theory is that in genetically susceptible people, certain viral infections can trigger the immune system to mistakenly attack the insulin-producing cells in the pancreas.
Income, Education, and Neighborhood
Your socioeconomic circumstances shape your diabetes risk in measurable ways. Diabetes prevalence follows a clear gradient from highest to lowest income. Compared to high-income adults, those classified as poor have roughly double the prevalence of diabetes. The pattern holds even after adjusting for age.
Education shows a similar stepwise relationship. Adults with less than a high school education are diagnosed with diabetes at a rate of 10.4 per 1,000 people per year. That drops to 7.8 for those with a high school diploma and 5.3 for those with more education. Overall prevalence follows the same pattern: 12.6% for those without a high school education versus 7.2% for those with education beyond high school.
Where you live matters too. Poor adults living in poor neighborhoods have twice the odds of having diabetes compared to higher-income adults in higher-income neighborhoods. Communities with lower average incomes and higher rates of food assistance use show faster progression from prediabetes to full diabetes. Limited access to affordable, nutritious food and safe places to exercise helps explain part of this pattern.
Conditions That Raise Your Risk
Several health conditions act as warning signs or direct contributors. Polycystic ovary syndrome (PCOS) is one of the strongest: more than half of women with PCOS develop type 2 diabetes by age 40. PCOS is closely tied to insulin resistance, and the metabolic stress it creates accelerates the path toward diabetes.
Non-alcoholic fatty liver disease is another independent risk factor. So is a history of cardiovascular disease, high blood pressure (130/80 or above), low levels of “good” cholesterol, or high triglycerides. These conditions often cluster together in what’s called metabolic syndrome. Research from the American Diabetes Association found that insulin levels and body size were the strongest predictors of future diabetes among the components of metabolic syndrome, while blood pressure alone was not a significant predictor.
Gestational Diabetes and Pregnancy
Women who develop diabetes during pregnancy are at elevated risk for type 2 diabetes later in life. Your risk of gestational diabetes is higher if you had it in a previous pregnancy, have given birth to a baby weighing more than 9 pounds, or are overweight at the start of pregnancy. A history of gestational diabetes also places you in a higher screening priority for type 2 diabetes going forward, even years after delivery.
Prediabetes as a Warning Stage
Prediabetes is the clearest predictor of who will eventually develop type 2 diabetes. Blood sugar levels are above normal but not yet in the diabetic range. Each year, between 5% and 10% of people with prediabetes cross that threshold into diabetes. The rate varies depending on the specific type of blood sugar abnormality involved. People who have both impaired fasting glucose and impaired glucose tolerance progress at a much higher rate of 15% to 19% per year.
The trajectory isn’t locked in. A similar proportion of people with prediabetes return to normal blood sugar levels each year, typically through weight loss and increased physical activity. But without intervention, the long-term outlook is concerning. In one 20-year study, more than 90% of participants with impaired glucose tolerance eventually developed diabetes. The window for action is real, but it narrows over time.
Putting It All Together
Diabetes risk isn’t determined by any single factor. It builds through layers: your genetics set a baseline, your weight and activity level raise or lower it, your age and health conditions add further pressure, and your socioeconomic environment shapes your access to prevention. The person most likely to develop type 2 diabetes is someone who carries several of these risk factors simultaneously. Someone over 45, overweight, with a family history, belonging to a higher-risk ethnic group, and living in a lower-income community faces a substantially different probability than someone with just one of those factors.
For type 1 diabetes, the profile is different: a younger person, often a child, with specific inherited immune-system genes who encounters an environmental trigger like a viral infection. For gestational diabetes, the highest-risk profile is a woman who is overweight, has had gestational diabetes before, or previously delivered a large baby. Across all three types, the common thread is that risk is layered and cumulative, not binary.