Just diagnosed with prediabetes? Your first 90 days
A prediabetes diagnosis usually arrives with no instructions: a flagged lab value in your patient portal, maybe a “let’s keep an eye on it” from your doctor, and then nothing. You’re left somewhere between alarmed and unsure whether this even counts as a real problem. It does count, but not the way you might fear. Prediabetes is the earliest, most fixable warning your body gives about type 2 diabetes, and the evidence on what to do next is unusually clear. Here’s a six-step plan for your first 90 days.
Step 1: Get your actual numbers
“You have prediabetes” is a category. What you want is the value behind it, because that’s the number you’ll try to move.
According to the NIH’s National Institute of Diabetes and Digestive and Kidney Diseases, prediabetes is diagnosed when:
- A1C is between 5.7% and 6.4%, or
- Fasting plasma glucose is 100–125 mg/dL, or
- An oral glucose tolerance test result is 140–199 mg/dL
An A1C of 5.8 and an A1C of 6.4 both land in that range, but they’re different starting points. Ask for the exact value, write it down, and note the date. Ninety days from now, you’ll want to know whether your number is drifting up or coming down.
Step 2: Understand what prediabetes is, and what it isn’t
Prediabetes means your blood sugar runs higher than normal because your body is becoming resistant to insulin, the hormone that moves glucose out of your blood. It is not type 2 diabetes, and progressing to type 2 diabetes is not inevitable.
You’re also not an outlier. The CDC reports that more than one in three American adults has prediabetes, and more than eight in 10 of them don’t know it. A diagnosis puts you ahead of most people in that group: you know, which means you can act while the condition is still quiet.
The honest version of the risk: the CDC notes that without changes, many people in this range develop type 2 diabetes within five years. The equally honest version of the opportunity is in the next two steps.
Step 3: Start moving, and aim at 150 minutes a week
The strongest evidence here comes from the Diabetes Prevention Program, a large NIH trial that followed thousands of adults in exactly your situation. The lifestyle group had two targets: 150 minutes of moderate activity a week and modest weight loss.
The result: they lowered their chance of developing type 2 diabetes by 58 percent compared with the placebo group. For participants over 60, the reduction was 71 percent.
One hundred fifty minutes sounds like a project. Spread out, it’s about 22 minutes a day, and brisk walking counts. If you’re starting from zero, start under the target: three 10-minute walks a week, then build. Consistency over 90 days matters more than intensity in week one.
Step 4: Aim for 5–7% weight loss, not a transformation
The DPP’s weight target was similarly modest: participants aimed to lose 7 percent of their body weight by eating fewer calories and less fat. For someone who weighs 200 pounds, 5–7% is 10–14 pounds.
That’s the number attached to the 58 percent risk reduction. Not a new body, not a diet with a name, just enough weight loss to make your cells respond to insulin better. If you weigh yourself weekly and log it, you’ll be able to see whether the trend line is moving, which beats judging progress by how any single morning feels.
Step 5: Ask about the lifestyle change program, and the medication question
Two things are worth raising at your next appointment.
First, the CDC runs a National Diabetes Prevention Program: a year-long, CDC-recognized lifestyle change program built directly on the trial evidence, offered in person and online, sometimes covered by insurance. A structured program with a coach is easier to stick to than a plan you improvise alone.
Second, medication. In the DPP trial, metformin lowered the risk of progressing to type 2 diabetes by 31 percent. Whether it makes sense for you depends on your numbers, age, and history, and that’s your clinician’s call, not ours. The useful move is simply to ask the question out loud.
Step 6: Book the retest, then track the space between
Once you have prediabetes, NIDDK recommends being tested for type 2 diabetes every year. Book that follow-up now, while the diagnosis still has your attention. A date on the calendar turns “I should really deal with this” into a deadline.
Between now and then, keep a simple log: weekly weight, activity minutes, and any home readings your doctor asks for. If you want to understand what your next A1C can and can’t tell you, we’ve written about what A1C misses that daily glucose shows, and our chronic-condition tracking hub covers how to bring 90 days of home data to an appointment in a form your doctor will actually read.
If you want a single place to keep all of this, your weight trend, your activity, your lab results, and the retest date, Katika Care does that. It’s free, no ads, no data resale, and works alongside Apple Health or Health Connect.
Ninety days from now, you could be walking into your retest with a lower number and a log that shows exactly how you got there.
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Frequently asked questions
Can prediabetes go away?
Often, yes. Blood sugar in the prediabetes range can return to the normal range, and large studies back this up. In the NIH's Diabetes Prevention Program, people who lost 5–7% of their body weight and got 150 minutes of weekly activity lowered their risk of progressing to type 2 diabetes by 58 percent, and by 71 percent for participants over 60. Your doctor can tell you what's realistic for your numbers and health history.
What A1C level is considered prediabetes?
An A1C between 5.7% and 6.4% falls in the prediabetes range, according to the NIH's National Institute of Diabetes and Digestive and Kidney Diseases. Below 5.7% is normal; 6.5% or higher on two tests is type 2 diabetes. Fasting glucose has its own range: 100–125 mg/dL is prediabetes. Ask for the exact value, not just the category, so you can track whether it moves.
How long does it take for prediabetes to turn into type 2 diabetes?
There's no fixed timeline. The CDC notes that without action, many people with prediabetes develop type 2 diabetes within five years, but progression isn't guaranteed in either direction. The pace depends on your starting numbers, weight, activity, family history, and age. That uncertainty is the argument for acting early and retesting yearly rather than waiting to see what happens.
Do I need medication for prediabetes?
That's a conversation for your doctor, not a blog. Lifestyle change is the first-line approach, but in the NIH's Diabetes Prevention Program trial, metformin lowered the risk of progressing to type 2 diabetes by 31 percent, and clinicians sometimes recommend it for people at higher risk. Bring the question to your appointment; the answer depends on your numbers, age, weight, and history.
What should I eat if I have prediabetes?
No single food causes or fixes prediabetes, and there's no official prediabetes diet. The pattern that worked in the NIH trial was reducing calories and fat enough to lose 5–7% of body weight, built around vegetables, whole grains, lean protein, and fewer sugary drinks. A registered dietitian or a CDC-recognized lifestyle change program can turn that into a plan you'll actually follow.