Prediabetes: What's Actually Happening in Your Body — and What the Research Says Changes It
One in three adults has prediabetes. Most don't know it. Here's what the science says about reversing it.
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Roughly one in three American adults has prediabetes — and the majority don't know it. That's not a scare tactic; that's the NIH via MedlinePlus describing a condition that sits quietly in the background until it doesn't.
The good news is that prediabetes is not a one-way door. Here's what's actually happening in your body, and what the research says moves the needle.
What "prediabetes" actually means
MedlinePlus describes prediabetes as blood glucose levels that are higher than normal but not yet high enough to be classified as type 2 diabetes. The standard marker is your A1C — a three-month blood sugar average.
According to MedlinePlus's A1C page:
- Below 5.7% = normal
- 5.7–6.4% = prediabetes
- 6.5% and above = type 2 diabetes
One number. That's the difference between "normal" and "you should pay attention to this."
The underlying driver is usually insulin resistance — your cells stop responding efficiently to insulin, so glucose stays in your bloodstream longer than it should. MedlinePlus notes that being overweight and physical inactivity are among the primary contributors researchers have identified.
This is not just a "pre" problem
The word "pre" makes it sound like nothing has happened yet. That framing is misleading.
MedlinePlus is direct: if you have prediabetes, you're already at higher risk for type 2 diabetes, heart disease, and stroke — not just later, but now. Elevated glucose does slow, cumulative damage even before it crosses the diagnostic threshold for diabetes.
It's also worth knowing that prediabetes doesn't automatically progress. It can stay stable, reverse to normal glucose, or advance to type 2 — and your choices have a real say in which direction it goes.
What the research says actually changes things
Lifestyle intervention is the most-studied tool, and it works.
A 2022 systematic review and meta-analysis published in the American Journal of Preventive Medicine looked specifically at interventions for reversing prediabetes — not just slowing it, but returning blood sugar to normal. The review found that lifestyle interventions were effective at achieving normoglycemia in people with prediabetes.
A 2025 systematic review in the Journal of Medical Internet Research — covering randomized controlled trials — examined different modes of lifestyle intervention (in-person, digital, hybrid) for preventing type 2 diabetes and reverting prediabetes to normal glucose. The authors found meaningful reversion rates across intervention types, though the specific numbers varied by program design.
And a 2026 study in Metabolism found that lifestyle intervention was particularly effective at restoring beta-cell function (your pancreas's insulin-making capacity) and reducing ectopic fat — the fat stored around organs that directly drives insulin resistance.
The pattern across this research is consistent: moving more, eating better, and losing even modest amounts of weight can shift blood sugar back toward normal.
What about GLP-1 medications?
If you're already on a GLP-1 medication for weight loss, there's relevant data here too.
A 2024 systematic review and meta-analysis in Diabetology & Metabolic Syndrome looked specifically at GLP-1 receptor agonists in people with prediabetes. The authors found that GLP-1 receptor agonists were associated with improvements in glycemic markers in this population across the randomized controlled trials they analyzed.
This doesn't mean GLP-1 drugs are prescribed for prediabetes — that's a conversation for your prescriber. But if you're using one for weight loss and you had prediabetes, your glucose picture may be improving alongside the scale.
A 2026 Bayesian network meta-analysis in BMC Medicine also assessed various anti-prediabetic drug classes, giving a broader view of the pharmacological options being studied — though lifestyle remains the most-researched first-line approach.
The regression question: can you actually go back to normal?
Yes — and this matters more than people realize.
A 2026 study in Diabetologia followed people who regressed from prediabetes to normoglycemia and examined what happened next. The finding: regression is meaningful, but cardiometabolic risk factors (like blood pressure, triglycerides, and weight) still influence your subsequent risk of developing type 2 diabetes even after your A1C normalizes. In other words, getting your number back into range is a win — but it's not a reset button that lets you ignore everything else.
A 2009 study in Diabetes Care from the Diabetes Prevention Program — one of the landmark trials in this space — showed that regression from prediabetes to normal glucose was achievable and associated with better long-term outcomes. The DPP remains one of the most-cited bodies of evidence on this topic.
What this means for you
- Your A1C number tells you where you are, not where you're going. Prediabetes is a signal, not a sentence. The research consistently shows that lifestyle changes can move that number back into normal range.
- Weight loss and movement are the most-studied levers. Even modest improvements in both have shown up repeatedly in the literature as effective for reverting blood sugar to normal.
- If you're on a GLP-1 medication, ask your prescriber about your glucose trajectory. The research suggests these medications may be influencing your blood sugar in addition to your weight — but your provider needs to interpret your specific numbers.
Not medical advice. Talk to your prescriber about your situation, your A1C, and what interventions make sense for you.
