Prediabetes is reversible, and lifestyle changes alone can cut your risk of developing type 2 diabetes by 58%. That number comes from the Diabetes Prevention Program, one of the largest studies ever conducted on the topic. The core strategy is straightforward: adjust what you eat, move more, and lose a modest amount of weight. Most people can bring their blood sugar back into the normal range without medication.
What Prediabetes Actually Means
Prediabetes means your blood sugar is higher than normal but hasn’t crossed the threshold for type 2 diabetes. You’ll be diagnosed with prediabetes if any of the following apply: an A1C between 5.7% and 6.4%, a fasting blood sugar between 100 and 125 mg/dL, or a two-hour glucose tolerance test result between 140 and 199 mg/dL. These numbers tell you that your body is struggling to manage sugar efficiently, usually because your cells have become less responsive to insulin.
The good news is that this stage is a window of opportunity. Your pancreas is still producing insulin, and the damage isn’t permanent. But prediabetes won’t fix itself if nothing changes. Without intervention, many people progress to full type 2 diabetes within a few years.
How Much Weight You Need to Lose
Current guidelines recommend losing at least 7% of your body weight. For someone who weighs 200 pounds, that’s 14 pounds. For someone at 250 pounds, it’s about 17 or 18 pounds. That target is based on the Diabetes Prevention Program results, where participants who hit that mark and stayed physically active saw the sharpest drop in diabetes risk.
You don’t need to reach an “ideal” weight or drop several clothing sizes. A relatively small, sustained loss is enough to meaningfully improve how your body handles blood sugar. Losing weight gradually, around one to two pounds per week, makes it far more likely to stay off than crash dieting.
Restructure Your Plate
The simplest framework for eating comes from the American Diabetes Association’s plate method: fill half your plate with nonstarchy vegetables like leafy greens, broccoli, or peppers. One quarter gets a healthy carbohydrate such as brown rice, quinoa, farro, or sweet potato. The last quarter is lean protein like chicken, fish, turkey, or tofu.
This approach works because it naturally controls portions of the foods that spike blood sugar while loading you up on fiber and nutrients. Aim for 25 to 30 grams of fiber per day from a variety of fruits, vegetables, and whole grains. Fiber slows down how quickly sugar enters your bloodstream after a meal, which reduces the sharp blood sugar spikes that stress your insulin system. Most Americans get about half that amount, so increasing fiber is one of the highest-impact changes you can make.
A few practical shifts that add up quickly: swap white rice for brown rice or cauliflower rice, choose whole grain bread over white, snack on nuts or vegetables instead of crackers or chips, and drink water instead of juice or sweetened beverages. You don’t need to eliminate carbohydrates entirely. The goal is choosing carbs that break down slowly and pairing them with protein or fat to blunt the blood sugar response.
Get 150 Minutes of Movement Per Week
The CDC recommends at least 150 minutes of moderate-intensity physical activity per week. That’s about 30 minutes a day, five days a week. Brisk walking counts. So does cycling, swimming, dancing, or anything that gets your heart rate up enough that you can talk but not sing.
Exercise helps in two distinct ways. First, when your muscles contract during activity, they pull sugar out of your blood for energy through a pathway that doesn’t even require insulin. This means exercise lowers blood sugar immediately, regardless of how insulin-resistant you are. Second, after a workout, your muscles become more sensitive to insulin for hours afterward. They move more glucose transporters to the cell surface, so the next time insulin signals them to absorb sugar, they respond more effectively.
Adding resistance training (bodyweight exercises, weight lifting, or resistance bands) two to three times a week amplifies these benefits. Muscle tissue is one of the biggest consumers of blood sugar in your body, so building more of it gives you a larger “sink” to absorb glucose around the clock. If you’re currently sedentary, start with 10-minute walks after meals and build from there. Even small amounts of movement after eating can blunt post-meal blood sugar spikes significantly.
Sleep Affects Your Blood Sugar More Than You Think
Getting fewer than seven hours of sleep per night directly worsens insulin resistance. This isn’t a vague association. In controlled studies, restricting sleep to five hours a night for just five consecutive nights decreased insulin sensitivity by 21%. At four to four and a half hours of sleep, insulin sensitivity dropped by 23% to 29%. Even a single night of sleep deprivation increased insulin resistance the next day.
Part of the mechanism involves cortisol, a stress hormone. Sleep restriction increased cortisol levels by 21% in one study and shifted the cortisol peak earlier in the day, with levels running 23% higher through the late afternoon and evening. Elevated cortisol tells your liver to release more sugar into the bloodstream and makes your cells less responsive to insulin, a double hit.
The encouraging flip side: people who extended their sleep beyond six hours showed improvements in fasting insulin resistance, insulin secretion, and the function of the cells that produce insulin. Prioritizing seven to eight hours of sleep is one of the most underrated tools for blood sugar management. If you struggle with sleep quality, consistent wake times, limiting screens before bed, and keeping your bedroom cool and dark are the interventions with the strongest evidence behind them.
When Medication Enters the Picture
For most people with prediabetes, lifestyle changes are the first and most effective approach. But the American Diabetes Association’s 2025 guidelines suggest considering metformin for people between ages 25 and 59 who have a BMI over 35, a fasting blood sugar above 110 mg/dL, an A1C above 6%, or women who had gestational diabetes. In the Diabetes Prevention Program study, metformin reduced the risk of developing type 2 diabetes by 31%, which is meaningful but notably less effective than the 58% reduction achieved through lifestyle changes alone.
Metformin works by reducing how much sugar your liver releases and improving your cells’ response to insulin. It’s not a substitute for diet and exercise, and in clinical practice, it’s typically used alongside those changes for people at the highest risk of progression. If your doctor hasn’t mentioned medication, that likely means lifestyle changes are your primary path forward.
How to Track Your Progress
The CDC recommends retesting your A1C every one to two years once you’ve been diagnosed with prediabetes. Your doctor may test more frequently in the first year if you’re making active changes and they want to gauge your response. An A1C below 5.7% means you’ve brought your blood sugar back into the normal range.
Beyond lab results, pay attention to practical signals. If you’re losing weight steadily, sleeping better, and finding that physical activity feels easier, your metabolic health is almost certainly improving even before your next blood draw. Some people see measurable A1C improvements within three to six months of consistent changes, though this varies based on where you started and how aggressively you’ve adjusted your habits.
Prediabetes isn’t a one-time problem to fix and forget. The habits that bring your blood sugar down are the same ones that keep it there. People who maintained their lifestyle changes in the Diabetes Prevention Program continued to see lower diabetes rates years after the study ended. Think of this less as a temporary intervention and more as a permanent upgrade to how you eat, move, and sleep.