Prediabetes is reversible. Each year, 5 to 10% of people with prediabetes progress to type 2 diabetes, but that trajectory isn’t locked in. With targeted changes to how you eat, move, and sleep, you can bring your blood sugar back into the normal range. The key numbers to know: prediabetes means an A1C between 5.7% and 6.4%, or a fasting blood glucose of 100 to 125 mg/dL. Getting below those thresholds is the goal, and lifestyle changes are the most effective tool to get there.
Why Prediabetes Happens
Prediabetes develops when your cells stop responding efficiently to insulin, the hormone that moves sugar from your blood into your cells for energy. Your pancreas compensates by producing more insulin, but over time it can’t keep up. The result is blood sugar that sits above normal but below the threshold for diabetes. This isn’t a vague warning. It’s a measurable metabolic shift that affects your blood vessels, kidneys, and nerves even before it becomes full diabetes.
The factors that drive it are interconnected: excess body fat (especially around the abdomen), inactivity, poor sleep, and a diet heavy in refined carbohydrates. The good news is that each of these is modifiable, and improving even one meaningfully changes the others.
Move 150 Minutes a Week
Physical activity is the single most powerful correction for prediabetes. The CDC recommends at least 150 minutes of moderate-intensity aerobic activity per week, which works out to about 30 minutes on five days. Brisk walking counts. So do cycling, swimming, dancing, or anything that raises your heart rate enough that you can talk but not sing.
What makes exercise so effective is what happens inside your muscles. When a muscle contracts, it pulls sugar out of the blood and into cells through a pathway that works independently of insulin. In other words, exercise lowers your blood sugar even when your insulin isn’t working well. This effect lasts for hours after you stop moving, which is why consistency matters more than intensity. A daily walk does more for your blood sugar over time than one weekend workout.
Adding strength training amplifies the benefit. Muscle tissue is the largest consumer of blood sugar in your body, so building more of it increases your capacity to process glucose around the clock. You don’t need a gym membership. Bodyweight exercises like squats, push-ups, and lunges, done two to three times per week, are enough to start shifting the balance.
Rethink Carbohydrates, Don’t Eliminate Them
Carbohydrates aren’t the enemy, but the type and amount you eat at one time matter enormously. What you want to understand is how quickly a food raises your blood sugar and how much sugar it delivers per serving. A food’s glycemic index scores it from 0 to 100 based on how fast it spikes blood sugar, with pure glucose at 100. But the glycemic index alone can be misleading. Watermelon has a high glycemic index, for example, but a typical serving contains relatively little sugar. A more useful measure, called glycemic load, accounts for both speed and quantity, giving you a realistic picture of what a food actually does to your blood sugar.
In practice, this means swapping refined grains (white bread, white rice, sugary cereals) for whole grains, legumes, and vegetables. It also means paying attention to portions. A small serving of brown rice with a meal behaves very differently in your bloodstream than a large bowl of it. Pairing carbohydrates with protein, fat, or fiber slows digestion and flattens the blood sugar curve. A piece of fruit with a handful of nuts, for instance, produces a much gentler glucose response than the fruit alone.
Prioritize Fiber
Most adults fall well short of the recommended 22 to 34 grams of fiber per day. That gap matters for prediabetes because insoluble fiber, the kind found in whole grains, vegetables, and nuts, directly improves insulin sensitivity. It passes through your digestive system largely intact, slowing the absorption of sugar and helping your cells respond better to insulin over time.
Practical sources include beans and lentils (around 7 to 8 grams per half cup), raspberries (8 grams per cup), oats, broccoli, and chia seeds. Building fiber intake gradually prevents bloating. If you’re currently eating around 10 to 15 grams a day, aim to add 5 grams per week until you reach the target range.
Lose a Modest Amount of Weight
You don’t need to reach an ideal body weight to reverse prediabetes. Losing just 5 to 7% of your body weight, which is 10 to 14 pounds for someone who weighs 200 pounds, is enough to produce significant improvements in insulin sensitivity and blood sugar levels. This is one of the most consistent findings in diabetes prevention research.
The most sustainable approach combines the dietary and activity changes described above rather than relying on calorie restriction alone. Crash diets tend to reduce muscle mass, which is counterproductive since muscle is exactly the tissue you need more of to clear sugar from your blood. A gradual loss of one to two pounds per week preserves muscle while reducing the visceral fat around your organs that drives insulin resistance.
Sleep Changes Your Hormones
Short or poor-quality sleep rewires the hormones that control hunger and blood sugar. When you’re sleep-deprived, your body produces less leptin (the hormone that signals fullness) and more ghrelin (the hormone that triggers hunger). This combination increases appetite and cravings, particularly for high-carbohydrate foods, making it harder to stick with any dietary plan. The hormonal shifts also directly worsen insulin resistance, independent of what you eat.
Aim for seven to eight hours per night. If you struggle with sleep quality, the basics make a measurable difference: a consistent wake time, a cool and dark bedroom, no screens for 30 to 60 minutes before bed, and limiting caffeine after noon. If you snore heavily or wake feeling unrested despite adequate hours, sleep apnea is worth investigating, as it independently worsens insulin resistance.
When Medication Enters the Picture
Lifestyle changes are the first-line treatment for prediabetes, but some people benefit from medication alongside those changes. Clinicians are most likely to consider prescribing metformin for people under 60, those with a BMI above 35, women with a history of gestational diabetes, or anyone whose A1C is in the higher end of the prediabetes range (6.0% to 6.4%). A strong family history of diabetes, elevated fasting glucose, and high triglycerides also factor into the decision.
Metformin works by reducing the amount of sugar your liver releases into your bloodstream and by improving how your cells respond to insulin. It’s not a substitute for lifestyle changes, but for people at higher risk, the combination is more effective than either approach alone.
Tracking Your Progress
The A1C test measures your average blood sugar over the past two to three months, making it the best tool for monitoring whether your changes are working. Most people with prediabetes should have their A1C checked at least twice a year. If you’re making significant lifestyle changes or starting medication, your doctor may test more frequently to see how you’re responding.
A fasting glucose test offers a snapshot of where your blood sugar sits on a given morning. Both tests together give the clearest picture. The target is an A1C below 5.7% and fasting glucose below 100 mg/dL. Many people see meaningful movement in these numbers within three to six months of consistent changes, though the timeline varies depending on your starting point and how much weight you lose.
Tracking doesn’t have to mean obsessing over numbers. Checking A1C on schedule and noticing practical markers, like whether your energy is steadier after meals, whether your waistline is shrinking, and whether you’re sleeping better, gives you a reliable sense of direction without turning your health into a full-time project.