Type 2 Diabetes Risk Factors: 10 Causes That Increase Your Risk
Almost everyone knows someone with type 2 diabetes, yet very few people can explain why it showed up in that particular person. The honest answer is that there is rarely one cause. Type 2 diabetes usually builds slowly, as several type 2 diabetes risk factors stack up over the years. Some of them you can influence. Some you can't.
This guide walks through 10 well-established risk factors, what each one does inside the body, and what you can realistically do about it. It builds on our complete guide to type 2 diabetes, so if you want the bigger picture first, start there.
One thing before we begin. A risk factor is not a diagnosis. It simply tells you your odds are higher than average, and that is useful because it shows you when to get tested and where your effort will count the most.
1. Family History and Genetics
If a parent or sibling has type 2 diabetes, your own risk goes up. Genes influence how much insulin your pancreas makes and how well your cells respond to it. Families also tend to share habits, like how they cook and how much they move, which makes it hard to separate nature from routine. The CDC lists family history among the main risk factors for type 2 diabetes.
You can't change your genes, but you can change what you do with the information. If diabetes runs in your family, treat it as a reason to get tested on schedule, not as a sentence.
Related reading: What Is Type 2 Diabetes?
2. Excess Body Weight, Especially Around the Waist
Extra weight is one of the strongest risk factors, and where it sits matters. Fat stored around the belly and organs is more closely tied to insulin resistance than fat stored on the hips or thighs. The NIDDK explains that being overweight raises the chance of developing type 2 diabetes.
Weight is not the whole story, though. Plenty of people at a healthy weight develop type 2 diabetes, and plenty of people with obesity never do. The encouraging part is that small changes count. In the large Diabetes Prevention Program trial, people with prediabetes who lost about 7 percent of their body weight and stayed active cut their chance of developing diabetes by 58 percent.
Related reading: Diabetes Meal Planning
3. Physical Inactivity
Your muscles are one of the biggest users of glucose in the body. When you rarely move, your cells respond less to insulin, and blood sugar has a harder time leaving the bloodstream. Regular activity does the opposite. The American Diabetes Association's position statement on physical activity describes how exercise improves insulin sensitivity.
A common target is 150 minutes of moderate activity a week, which works out to about 30 minutes on five days. Brisk walking counts. Long, uninterrupted sitting is its own problem, so standing up and moving for a few minutes every hour helps, too.
Related reading: Exercise and Blood Sugar
4. Getting Older
Risk climbs with age. Guidelines have long pointed to 45 as the point at which risk rises more noticeably, and the American Diabetes Association now recommends screening for many adults starting at age 35. Part of the reason is that we tend to lose muscle, move less, and gain weight gradually as the years pass. Part of it is that the pancreas slowly loses some of its capacity.
Age should not make younger people feel safe, either. Type 2 diabetes is being diagnosed more often in young adults and teenagers than it used to be.
5. Prediabetes
Prediabetes means your blood sugar is higher than normal but below the diabetes cutoff. The CDC defines it as a fasting glucose of 100 to 125 mg/dL or an HbA1c of 5.7 to 6.4 percent. It is the clearest warning sign you can get, and most people who have it don't know, because it rarely causes symptoms.
It is also the stage where changes work best. The CDC's National Diabetes Prevention Program offers structured lifestyle coaching for exactly this situation, and a blood test is the only way to find out where you stand.
Related reading: Prediabetes vs Type 2 Diabetes · Understanding HbA1c
6. A History of Gestational Diabetes
Gestational diabetes usually disappears after delivery, but it leaves a mark. Women who had it are noticeably more likely to develop type 2 diabetes later, sometimes years afterward. The NIDDK lists a history of gestational diabetes as a recognized risk factor.
If this applies to you, ask your provider about regular glucose testing. Screening at least every three years is commonly advised, and some people need it more often. Staying active and keeping a steady weight after pregnancy also helps.
7. Polycystic Ovary Syndrome (PCOS)
PCOS is a hormone condition that can cause irregular periods, acne, and extra hair growth. Insulin resistance is common in women with PCOS, even at a normal weight, which is why the condition raises the odds of type 2 diabetes. The Office on Women's Health has a clear overview of the link.
If you have PCOS, ask about a glucose or HbA1c test rather than waiting for symptoms. Many women with PCOS are never offered one.
8. High Blood Pressure and Abnormal Cholesterol
These often travel together with insulin resistance. The pattern most linked to diabetes is low HDL ("good") cholesterol combined with high triglycerides and raised blood pressure. The Mayo Clinic lists both as conditions associated with higher diabetes risk.
Neither one causes obvious symptoms, so you only find out by measuring. A routine check every year or so is a simple way to catch them early.
9. Poor Sleep and Chronic Stress
This one is less talked about, but the research keeps pointing in the same direction. Short sleep and untreated sleep apnea are associated with lower insulin sensitivity, as this overview of sleep and type 2 diabetes explains. Stress hormones like cortisol can also push blood sugar up, and a stressful stretch usually means worse sleep, less exercise, and more comfort eating.
To be fair, this is an association, not proof that a bad week of sleep causes diabetes. But better sleep and calmer days are low-risk changes that help nearly everything else on this list.
Related reading: Sleep and Blood Sugar · Stress and Blood Sugar
10. Race and Ethnicity
In the United States, type 2 diabetes is more common among Black, Hispanic and Latino, American Indian, Asian American, and Pacific Islander communities. The NHS also notes that people of South Asian, African-Caribbean, and Black African descent face a higher risk in the UK.
The reasons are mixed. They include genetics, differences in where the body stores fat, and unequal access to fresh food, safe places to exercise, and regular healthcare. Some groups develop diabetes at lower body weights, which is why screening may start earlier for them. This is about knowing your odds, not about blame.
Other Things That Can Add to Your Risk
A few more factors deserve mention. Smoking is linked to a higher risk of type 2 diabetes. Long-term use of certain medicines, such as steroids, can raise blood sugar. And an eating pattern heavy in sugary drinks and highly refined foods tends to work against you over time, as the Harvard Nutrition Source explains. No single food does this on its own. It is the overall pattern that counts.
Risk Factors You Can Change and Ones You Can't
| You can influence | You cannot change |
|---|---|
| Body weight and belly fat | Family history and genetics |
| Physical activity | Age |
| Eating pattern | Race and ethnicity |
| Sleep and stress | History of gestational diabetes |
| Blood pressure and cholesterol (with care) | PCOS (manageable, not changeable) |
| Smoking | Prediabetes history (progression can be slowed) |
Notice how many items sit in the left column. Even with a strong family history, there is usually more within your control than it feels like at first.
What to Do If Several Risk Factors Apply to You
Seeing yourself in a few of these is common and not a reason to panic. A sensible plan looks like this:
- Get tested. An HbA1c or fasting glucose test takes minutes and gives you a real number to work from.
- Start with movement. Aim for regular walks, then build up. Consistency beats intensity.
- Adjust your plate. Add more vegetables, beans, and whole grains, and cut back on sugary drinks first.
- Protect your sleep. A steady bedtime and a dark, cool room go a long way.
- Check blood pressure and cholesterol at your next appointment, even if you feel fine.
- Repeat testing on a schedule your provider recommends, especially if you have prediabetes.
Frequently Asked Questions
What is the biggest risk factor for type 2 diabetes?
There is no single biggest one for everyone. Excess weight, family history, and prediabetes are among the strongest, and they often overlap.
Can you get type 2 diabetes with no risk factors?
Yes, though it is less common. Some people develop it with few or no known risk factors, which is why routine screening still matters.
Does eating sugar cause type 2 diabetes?
Not directly. Diet contributes, especially over the long term and alongside weight gain, but sugar alone does not cause the condition.
Can I lower my risk if diabetes runs in my family?
Yes. Regular activity, a balanced eating pattern, healthy sleep, and timely testing can meaningfully lower your risk, even with a family history.
At what age should I get tested for type 2 diabetes?
Many guidelines suggest starting around age 35, or earlier if you have risk factors such as prediabetes, PCOS, or a history of gestational diabetes. Your provider can advise you.
Key Takeaways
- Type 2 diabetes usually develops from several risk factors combining over time, not from one cause.
- The 10 main risk factors are family history, excess weight, inactivity, age, prediabetes, gestational diabetes, PCOS, high blood pressure and cholesterol, poor sleep and stress, and ethnicity.
- Some factors, like genes and age, can't be changed. Weight, activity, eating habits, and sleep can.
- Having risk factors means higher odds, not a certain diagnosis.
- A simple blood test is the most reliable way to know where you stand.
- Small, steady changes can cut risk, especially at the prediabetes stage.
References
- Centers for Disease Control and Prevention. Risk Factors for Type 2 Diabetes. https://www.cdc.gov/diabetes/risk-factors/index.html Supports the list of recognized risk factors.
- National Institute of Diabetes and Digestive and Kidney Diseases. Risk Factors for Type 2 Diabetes. https://www.niddk.nih.gov/health-information/diabetes/overview/risk-factors-type-2-diabetes Supports family history, weight, age, and gestational diabetes as risk factors.
- National Institute of Diabetes and Digestive and Kidney Diseases. Diabetes Prevention Program (DPP). https://www.niddk.nih.gov/about-niddk/research-areas/diabetes/diabetes-prevention-program-dpp Supports the 58 percent risk reduction with lifestyle change.
- Centers for Disease Control and Prevention. About Prediabetes and Type 2 Diabetes. https://www.cdc.gov/diabetes-prevention/about-prediabetes-type-2/index.html Supports the prediabetes definition and thresholds.
- Centers for Disease Control and Prevention. National Diabetes Prevention Program. https://www.cdc.gov/diabetes-prevention/index.html supports lifestyle change program information.
- American Diabetes Association. Standards of Care in Diabetes 2026, Section 2: Diagnosis and Classification of Diabetes. Diabetes Care, 2026. https://diabetesjournals.org/care/article/49/Supplement_1/S27/163926/2-Diagnosis-and-Classification-of-Diabetes Supports screening age and diagnostic criteria.
- American Diabetes Association. Physical Activity/Exercise and Diabetes: A Position Statement. Diabetes Care, 2016. https://diabetesjournals.org/care/article/39/11/2065/37249/Physical-Activity-Exercise-and-Diabetes-A-Position Supports the role of exercise in insulin sensitivity.
- Office on Women's Health, U.S. Department of Health and Human Services. Polycystic Ovary Syndrome. https://www.womenshealth.gov/a-z-topics/polycystic-ovary-syndrome Supports the PCOS and insulin resistance link.
- Mayo Clinic. Type 2 Diabetes: Symptoms and Causes. https://www.mayoclinic.org/diseases-conditions/type-2-diabetes/symptoms-causes/syc-20351193 Supports blood pressure, cholesterol, and general risk factors.
- National Health Service (UK). Type 2 Diabetes: Causes. https://www.nhs.uk/conditions/type-2-diabetes/causes/ Supports ethnicity-related risk information.
- WebMD. Type 2 Diabetes and Sleep. https://www.webmd.com/diabetes/type-2-diabetes-sleep Supports the sleep and insulin sensitivity association.
- Harvard T.H. Chan School of Public Health, The Nutrition Source. Carbohydrates and Blood Sugar. https://nutritionsource.hsph.harvard.edu/carbohydrates/carbohydrates-and-blood-sugar/ Supports the eating pattern discussion.
- World Health Organization. Diabetes Fact Sheet. https://www.who.int/news-room/fact-sheets/detail/diabetes Supports general background on type 2 diabetes.
General background on insulin resistance and lifestyle factors reflects consistent guidance from the American Diabetes Association, CDC, and NIDDK, and has been paraphrased rather than drawn from a single source per claim. For more on insulin resistance, see the Cleveland Clinic overview.
