Most weeks, someone sits down across from me holding a single sheet of paper they do not fully understand. They went in for a routine physical, felt fine, and a few days later a message landed in the patient portal: your A1c is 5.9. Maybe there was a one-line note — "borderline, let's recheck in a year" — and maybe there was nothing at all. What there usually was not is an explanation of what the number means, whether it is an emergency, or what, if anything, they are supposed to do about it. So they arrive somewhere between worried and dismissive, and the honest answer is that neither reaction is quite right.
Prediabetes is one of the most important numbers in midlife metabolic health, and also one of the most poorly explained. It is not diabetes. It is not nothing. It is a specific, defined range that tells you the system has started to drift — and, more usefully, that you are standing inside a window where the drift is still very much reversible. That window is what this article is about.
What the number actually means
Prediabetes is defined by numbers, and it helps to see the actual bands rather than a vague "borderline." Three different tests can land you there, and they are established, textbook definitions:
- A1c of 5.7 to 6.4 percent. A1c reflects your average blood sugar over roughly the prior three months. Below 5.7 is considered normal; 5.7 to 6.4 is prediabetes; 6.5 percent or higher, confirmed, is the threshold for type 2 diabetes.
- Fasting glucose of 100 to 125 mg/dL. Measured after eight or more hours without food. Under 100 is normal, 100 to 125 is impaired fasting glucose, and 126 or higher is the diabetes threshold.
- A two-hour glucose of 140 to 199 mg/dL on a glucose tolerance test, where 200 or higher is the diabetes range.
You do not need all three to be in the prediabetes range to carry the label — any one of them can put you there. And the tests do not always agree, which is one reason a single borderline A1c deserves a closer look rather than a shrug. The number I care about most is not any one value in isolation but the trajectory: an A1c of 5.9 that was 5.5 two years ago is telling a different story than a stable 5.7 that has not budged in a decade.
The key reframe is this. That range sits *before* the point where the pancreas can no longer keep up. The dysfunction underneath it — usually insulin resistance, which is common and quietly missed on standard labs — has been building for years, silently, while your glucose stayed normal. Prediabetes is the moment it finally becomes visible on a routine test. That visibility is not bad news. It is the earliest actionable warning most people will ever get.
You are not an outlier — and that is the problem
If you were just told you have prediabetes, you are in enormous company. By the best public-health estimates, roughly one in three American adults meets the criteria for prediabetes — and the majority of them do not know it. They feel fine, their glucose has never been flagged, and no one has ever ordered the marker that would catch it early.
I raise the prevalence not to make the number feel trivial, but to make two points. First, prediabetes is not a personal failing or an exotic diagnosis; it is the predictable result of a food environment and an activity pattern that most of us live inside. Second, the reason it is so common is precisely the reason it is so dangerous: it is usually silent. There is rarely a symptom to prompt the test. Most people who have it are found by accident, and most people who have it and are *not* found are the ones who show up years later with established diabetes and the complications that were quietly accruing the whole time.
That is the case for taking a 5.9 seriously even though you feel completely normal. Feeling fine is not evidence that nothing is wrong. It is the expected experience of someone standing in the reversal window with the door still open.
Why this is, genuinely, the good-news diagnosis
Here is the part I want patients to actually hear. Of all the ways your metabolism can send up a flare, prediabetes is close to the best-case scenario, because it is the one where lifestyle change still does the heavy lifting and often does it dramatically.
The reason is mechanical. At the prediabetes stage, the pancreas is still working. The beta cells that make insulin are stressed but not exhausted. The insulin resistance is present but not yet entrenched to the point of no return. When you reduce the demand on that system — by improving how your muscles pull glucose out of the blood, by losing some visceral fat, by steadying the meals that spike it — the system has enough reserve left to respond. Blood sugar comes back down, and the A1c follows over the next few months.
Once someone crosses into established diabetes, the beta cells have usually lost a meaningful chunk of their capacity, and while the disease is very manageable, that capacity does not fully come back. The reversal window is the stretch of road *before* that loss. You are, for now, on the right side of it.
What the prevention research actually found
The strongest evidence here comes from a landmark diabetes prevention trial that has shaped how clinicians think about this stage for two decades. I will keep it qualitative, because the headline is what matters and the exact decimals are less important than the shape of the finding.
Adults with prediabetes were assigned to a structured lifestyle program — modest weight loss and regular activity — or to a medication, or to a placebo. The lifestyle group did not just do a little better. They cut their risk of progressing to type 2 diabetes dramatically, on the order of half, over the following years. And notably, the lifestyle approach *outperformed* the medication in that trial. The target was not heroic: a modest, sustainable weight loss — the figure used in national prevention programs is around 5 to 7 percent of body weight — paired with roughly 150 minutes of activity a week.
Sit with that for a second. A single-digit percentage of body weight, plus a walk most days, roughly halved the odds of a disease that drives heart attacks, kidney failure, and blindness. There are very few interventions in all of medicine with that kind of leverage, and this one is available to almost everyone with a prediabetes number.
Not sure where to start?
If a lab just told you your A1c is creeping up, a few minutes on the Start Here pathway point you toward the right kind of visit before you guess at a plan.
Your muscle is the glucose sink you are not using
If I had to name the single most underused tool at the prediabetes stage, it is skeletal muscle. Muscle is the largest site in the body for pulling glucose out of the bloodstream, and it does a lot of that work through a pathway that does not even require much insulin when the muscle is contracting. In plain terms: working muscle is a glucose sink, and the more capacity that sink has, the more room your system has to soak up a meal without the blood sugar climbing.
This is why I push resistance training harder than almost anything else with these patients. Aerobic activity matters and I want it in the plan, but building and using muscle changes the underlying capacity of the system in a way that cardio alone does not. Even a single session improves insulin sensitivity for a day or two afterward; a sustained habit raises the baseline. I have written separately about strength training for mid-life body composition and about preserving and building muscle while losing fat, and both apply directly here. If you do one new thing after reading this, let it be picking up something heavy a couple of times a week.
Two to three short, progressive resistance sessions a week, plus the walking, plus protein distributed across your meals, is not a punishing prescription. It is the highest-leverage, lowest-cost intervention for a prediabetes number that exists.
Managed, not cured: the honest version
I want to be straight about the language, because a lot of the internet is not. You will see "reverse your prediabetes" everywhere, and it is not exactly wrong, but it is easy to hear it as "cure," and cure is the wrong word.
Here is the accurate version. Regression to normal blood sugar is common and very achievable when the underlying drivers are addressed and the change is sustained. Plenty of people take a 6.1 back down to 5.5 and hold it there for years. That is a real, meaningful win, and it lowers hard outcomes, not just a lab value. But the underlying tendency toward insulin resistance does not disappear. It is being *managed* by the way you are living, and if the management stops — the training tapers off, the old eating pattern returns, the weight comes back — the number tends to drift up again. Relapse is common precisely because the biology is still there underneath the good result.
I say this not to be discouraging but to be useful. If you understand from the start that this is a durable change in how you operate rather than a 90-day fix you complete and forget, you make different decisions. You build habits you can actually keep instead of a crash you cannot sustain. The people who do best are the ones who internalize "managed, not cured" early and design for the long haul.
What a real workup adds beyond the A1c
An A1c alone is a blunt instrument. It tells you where your average landed, but not why, and not how close to the edge the system actually is. When someone comes in with a borderline A1c, the fuller picture usually changes the plan.
The marker I most want to see is fasting insulin, which is almost never on a standard panel and which reveals whether the pancreas is already working overtime to keep glucose looking normal. A high fasting insulin sitting next to a "fine" glucose is the fingerprint of insulin resistance that has quietly been building for years — the engine behind the prediabetes number. A lipid panel with the triglyceride-to-HDL ratio adds another clean read on the same underlying process. For patients who want to *see* what specific meals do to them, a continuous glucose monitor can be a genuinely useful window into the shape of their glucose curve — with the caveat that a routine dip on the readout is not, by itself, a problem, a point I make in more detail in the piece on why post-meal shakiness is usually not true hypoglycemia.
None of this is exotic testing. It is the difference between "your sugar is a little high, try to eat better" and a specific, mechanism-based plan built around what is actually driving your number. That fuller picture is what nutritional counseling and a structured medical weight loss evaluation are designed to produce.
Where medication, including GLP-1s, fits
Patients often ask, sometimes hopefully and sometimes warily, whether they need a medication — and specifically whether they need one of the GLP-1 drugs everyone is talking about. My honest answer is: usually not for a prediabetes number by itself, and never automatically.
For most people at this stage, the first-line plan is the unglamorous one — nutrition, activity, muscle, sleep, and modest weight loss — because it is what the evidence supports and what carries the fewest downsides. Medication becomes a real part of the conversation when the broader picture warrants it: significant excess weight, a metabolic profile that is not responding to lifestyle change, or a personal risk history that shifts the calculus. When that is the case, it belongs inside a supervised program rather than an online script, and the difference between those two things is not trivial. I have written a full guide to what to look for in a medical weight-loss program, and the short version is that the monitoring, the muscle-preservation plan, and the off-ramp are what separate a responsible program from a prescription mill.
The point is that the medication conversation is a *clinical* one, made with a provider who has the full picture — not a reflex triggered by a single lab value. An A1c of 5.9 does not, on its own, mean you need a drug.
What I would do if this were your number
If a lab just told you your A1c is in the prediabetes range, the specific next step is not to panic and not to file it away for a year. It is to get the fuller picture and turn a vague warning into a plan while the window is open.
Start with the weight loss assessment, then come in to the Columbus or Warner Robins clinic, or open with the comprehensive workup if you are not sure which door is right. Bring any labs from the last year, your medication and supplement list, and an honest paragraph about your activity, your sleep, and what your meals actually look like on a normal day. We will fill in the markers that are missing — fasting insulin above all — review them together, and build a plan around the drivers we find rather than around a single number.
The reason I want people in sooner rather than later is the reason this whole article exists: prediabetes is the one metabolic warning where early, modest action still does the most work. The window does not stay open forever, but right now, for you, it is open. That is genuinely good news, and it is worth acting on while it is true.
Medical disclaimer: This article is educational and is not medical advice. It does not diagnose or treat any condition, and it is not a substitute for evaluation by a qualified clinician who knows your history. Diagnostic thresholds and treatment decisions belong with your own provider. Individual response varies.
Travis spent 17+ years in high-acuity clinical medicine — emergency, cardiac ICU, and cath lab — before founding Revitalize. He is a Certified Platinum Biote hormone therapy provider, the published author of You're Not Broken — You're Unbalanced, and the founder of the Rebuild Metabolic Health Institute. His clinical writing reflects the same precision he brought to critical care: specific, honest, and built around what actually works.
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