Prediabetes Despite a Healthy Lifestyle: Causes and Next Steps

Prediabetes Despite a Healthy Lifestyle: Causes and Next Steps

You can get prediabetes despite a healthy lifestyle because several major risk factors are outside your control: family history, age, ethnicity, conditions such as polycystic ovary syndrome or sleep apnea, and certain long-term medicines. A healthy routine lowers your risk but does not erase it, and prediabetes can still be reversed or held steady.

This guide is for people who eat well and stay active yet were surprised by a borderline blood sugar result, and want to understand why and what to do now.

Key takeaways

  • More than 2 in 5 American adults have prediabetes, according to the CDC, so a result in that range is common, not a personal failure.
  • Prediabetes is diagnosed with an A1C of 5.7% to 6.4%, a fasting glucose of 100 to 125 mg/dL, or a 2-hour glucose tolerance result of 140 to 199 mg/dL, per the NIDDK.
  • Risk factors you can't change include family history of type 2 diabetes, age, and being African American, Hispanic, American Indian, Asian American or Pacific Islander.
  • Long-term use of glucocorticoids, some antipsychotics and some HIV medicines can raise risk, as can sleep apnea, PCOS and fatty liver disease.
  • Structured lifestyle programs can lower the risk of type 2 diabetes by 58%, or 71% if you're over 60, according to the CDC.

What is prediabetes?

Prediabetes means your blood sugar is higher than normal but not high enough to be diagnosed as type 2 diabetes. It usually has no symptoms, so it's found on routine blood tests.

The underlying problem is usually insulin resistance: muscle, fat and liver cells respond poorly to insulin, the hormone that moves glucose out of the blood. The NIDDK explains that the pancreas works harder to compensate, and over time it may not keep up, so blood glucose rises. If you're unclear how this relates to the two main types of diabetes, our explainer on type 1 vs type 2 diabetes sets out the differences.

TestNormalPrediabetesNotes
A1CBelow 5.7%5.7% to 6.4%Average glucose over about three months; may be less accurate with some health conditions
Fasting plasma glucoseBelow 100 mg/dL100 to 125 mg/dLNeeds an overnight fast
Oral glucose tolerance test (2-hour)Below 140 mg/dL140 to 199 mg/dLTakes longer, costs more, and catches some cases the others miss

Thresholds from the NIDDK. The NIDDK notes A1C may miss prediabetes in people with certain health conditions, which is one reason doctors sometimes repeat or combine tests.

Why do healthy people get prediabetes?

Because diet and exercise are only part of the risk. Genetics, age, ethnicity, hormones, sleep disorders and medicines all affect how your body handles glucose, and they act regardless of how clean your plate is.

Family history and ethnicity

Having a parent, brother or sister with type 2 diabetes raises your risk, per the CDC. So does being African American, Hispanic or Latino, American Indian or Alaska Native, and some Pacific Islander and Asian American groups. Some people develop insulin resistance at a lower body weight than others, so a "normal" BMI is not a guarantee.

Age

The CDC lists age 45 or older as a risk factor, and the NIDDK lists 35 or older. Muscle mass tends to fall with age, and muscle is a major site for clearing glucose, which is one reason strength training after 40 is so useful.

Hormonal and metabolic conditions

The NIDDK names polycystic ovary syndrome (PCOS), Cushing's syndrome, acromegaly and sleep apnea. The CDC adds non-alcoholic fatty liver disease, which can occur in people who don't look overweight. A history of gestational diabetes, or giving birth to a baby over 9 pounds, also raises risk.

Medicines

The NIDDK lists long-term use of glucocorticoids (steroid medicines such as prednisone), some antipsychotics and some HIV medicines as risk factors. If you take any of these, don't stop them on your own. Ask your prescriber whether your glucose should be monitored more closely.

Sleep

Sleep apnea is a named risk factor, and the NIDDK includes getting enough sleep as part of preventing and reversing insulin resistance. If you snore loudly, wake unrefreshed or nod off in the day, ask about a sleep study. Better habits help too; see our guide to sleep hygiene tips that actually work.

Smoking, vaping and stress

Smoking, vaping and secondhand smoke exposure are on the NIDDK risk list. Chronic stress is harder to measure, but it often disrupts sleep, eating and activity, and stress hormones work against insulin. Practical tools for calming your nerves are worth adding if stress is constant.

Does a "healthy" diet still need changes?

Often, a little. Many diets that look healthy still carry more refined starch, fruit juice or large portions than you'd expect, and those matter more once insulin resistance is present.

The goal is not a perfect diet but a steadier glucose pattern: plenty of fiber, protein with meals, and fewer sugary drinks and refined carbohydrates. Our guide to high-fiber foods and how to eat more is a good place to start, and if you love starchy staples, see how potatoes can fit a blood sugar plan. For a stepwise approach to cutting back, our no-sugar diet guide shows how to reduce added sugar without going to extremes.

What should you do after a prediabetes result?

Confirm the result, look for hidden causes, and make targeted changes. Then retest so you know whether they are working.

  1. Confirm the diagnosis. Ask your doctor whether to repeat the test or add a different one, especially if you have a condition that affects A1C accuracy.
  2. Review your medicines with your doctor or pharmacist, particularly steroids, antipsychotics and HIV medicines.
  3. Screen for linked conditions such as sleep apnea, PCOS, fatty liver disease and thyroid problems if symptoms fit.
  4. Move more, and include strength work. The CDC suggests at least 150 minutes a week of brisk walking or similar activity.
  5. Set a weight goal if relevant. The CDC suggests losing 5% to 7% of body weight if you are overweight, about 10 to 14 pounds for someone weighing 200 pounds.
  6. Consider a structured program. The CDC's National Diabetes Prevention Program can lower your risk of type 2 diabetes by 58%, or 71% if you're over 60.
  7. Ask about metformin. The NIDDK says it may be prescribed and, in the Diabetes Prevention Program, worked best for women with past gestational diabetes, younger adults and people with obesity.
  8. Retest on the schedule your doctor suggests, often within a year.

For more day-to-day tactics, our article on what really works to keep blood sugar in check goes deeper.

There is good news here: the NIDDK reports that in the long-term Diabetes Prevention Program Outcomes Study, lifestyle changes or metformin prevented or delayed type 2 diabetes for at least 15 years.

Common mistakes after a prediabetes diagnosis

  • Assuming the test is wrong because you eat well. Confirm it, but don't dismiss it.
  • Going ultra-low-carb overnight. Extreme diets are hard to sustain, and stability matters more than speed.
  • Only doing cardio. Adding resistance training builds the muscle that clears glucose.
  • Ignoring sleep. Untreated sleep apnea or chronic short sleep can undercut every other change.
  • Never retesting. Without a follow-up number you won't know whether your plan is working.
  • Stopping a prescribed medicine on your own. Talk to your prescriber about alternatives instead.

When to see a doctor

Everyone with a prediabetes result should have a follow-up plan with a doctor. See a doctor sooner if you notice:

  • Strong thirst, frequent urination or getting up at night to urinate
  • Unexplained weight loss, blurred vision or constant fatigue
  • Slow-healing cuts or frequent skin, gum or urinary infections
  • Numbness or tingling in your hands or feet
  • Loud snoring, gasping in sleep or severe daytime sleepiness
  • Rising glucose readings after starting a steroid or other medicine

Seek emergency care for confusion, vomiting with very high glucose readings, or fast, deep breathing.

Frequently asked questions

Can you have prediabetes at a normal weight?

Yes. Overweight is a risk factor, but family history, age, ethnicity, PCOS, fatty liver disease, sleep apnea and certain medicines raise risk regardless of size. Some people develop insulin resistance at a lower body weight than others. If you are at a normal weight, focus on building muscle, sleep, fiber and checking for underlying conditions.

Is prediabetes reversible?

Often, yes. The NIDDK says healthy living may prevent or reverse insulin resistance and prediabetes, and the CDC reports structured lifestyle programs cut type 2 diabetes risk by 58%. Not everyone returns to normal, but even holding your numbers steady keeps you out of the diabetes range and lowers long-term risk.

Which test is most accurate for prediabetes?

Each test measures something different. A1C reflects about three months of glucose, fasting glucose is a snapshot, and the 2-hour glucose tolerance test shows how you handle a sugar load. The NIDDK notes A1C may miss prediabetes in some health conditions, so your doctor may combine or repeat tests to be sure.

How quickly does prediabetes turn into diabetes?

There's no fixed timeline. It depends on your risk factors and what you change. The CDC notes prediabetes often goes undetected until type 2 diabetes appears, which is why early action counts. Regular retesting tells you whether you're moving toward or away from the diabetes range.

What to do next

  • Book a follow-up to confirm your result and agree on a retest date.
  • Bring a full list of your medicines and ask whether any affect blood sugar.
  • Add two strength sessions a week to your current activity.
  • Take the CDC risk test and ask your doctor about a local National Diabetes Prevention Program.

This article is for general information and is not medical advice. Please discuss your test results and treatment options with your own doctor.

Sources

Last reviewed: October 2026.

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