If you’ve been told you have prediabetes, the single most effective thing you can do is lose a modest amount of weight through better eating and regular movement. A landmark study of over 3,200 people found that a lifestyle program targeting 7% body weight loss and 150 minutes of weekly activity cut the risk of developing type 2 diabetes by 58%. That’s a powerful number, and it means prediabetes is one of the clearest warning signs in medicine that you can actually do something about.
What Prediabetes Actually Means
Prediabetes means your blood sugar is higher than normal but not yet in the diabetic range. You’ll get diagnosed through one of three blood tests: 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 between 140 and 199 mg/dL. Any one of those results qualifies.
Without changes, roughly 4 out of every 100 people with prediabetes progress to type 2 diabetes each year. That risk compounds over time, which is why acting early matters so much. The good news is that prediabetes is reversible for many people, and the steps involved aren’t extreme.
How Much Weight Loss Actually Helps
You don’t need to reach an ideal body weight. In the Diabetes Prevention Program trial, the target was just 7% of body weight. For someone weighing 200 pounds, that’s 14 pounds. Half the participants hit that goal within six months, and the group as a whole saw their diabetes risk drop by 58% compared to those who made no changes. That reduction was nearly twice as effective as medication alone.
The weight loss doesn’t need to happen fast. Slow, steady progress over several months is what the most successful participants achieved. Even losing 5% of your body weight produces measurable improvements in how your body handles blood sugar.
What to Eat
A Mediterranean-style eating pattern is widely considered the best approach for prediabetes. It emphasizes whole grains, vegetables, lean protein, and healthy fats like olive oil and nuts. Johns Hopkins Medicine recommends building your plate in a simple ratio: half nonstarchy vegetables (leafy greens, broccoli, peppers), a quarter whole grains (brown rice, quinoa, farro), and a quarter lean protein (chicken, fish, tofu).
Fiber is especially important because it slows down how quickly sugar enters your bloodstream after a meal. Aim for 25 to 30 grams per day from fruits, vegetables, whole grains, and legumes. For reference, most Americans get about half that. A practical starting point: choose cereals with at least 5 grams of fiber per serving, eat whole fruits rather than juice, and add beans or lentils to meals a few times a week.
You don’t need to eliminate carbohydrates entirely. The goal is choosing carbs that break down slowly, pairing them with protein or fat, and keeping portions reasonable. White bread, sugary drinks, and refined snacks spike your blood sugar quickly. Swapping those for whole grain alternatives and water makes a real difference over time.
How to Move More
The target is 150 minutes of moderate-intensity activity per week. That breaks down to about 30 minutes on most days. “Moderate intensity” means activities like brisk walking, cycling, swimming, or anything that raises your heart rate enough that you can talk but not sing. You don’t need a gym membership. Walking is the most studied and most accessible option.
Strength training matters too. Building muscle improves your body’s ability to pull sugar out of the bloodstream, because muscle tissue is one of the biggest consumers of glucose. Even two sessions a week of bodyweight exercises, resistance bands, or light weights adds meaningful benefit on top of aerobic activity.
If you’re starting from zero, don’t aim for 150 minutes right away. Ten-minute walks after meals are a proven way to lower post-meal blood sugar spikes, and they add up. The participants in the Diabetes Prevention Program who were most successful started gradually and built consistency over weeks.
Sleep and Blood Sugar
Short or poor-quality sleep has a direct relationship with blood sugar control that most people underestimate. Sleeping five hours or less per night roughly doubles the odds of prediabetes compared to sleeping seven hours. Frequently waking up too early or having trouble staying asleep also raises risk significantly, with some research showing a two- to three-fold increase in prediabetes odds for people who experience these problems five or more times per month.
Sleep deprivation increases insulin resistance, meaning your cells respond less effectively to insulin, and it also ramps up appetite hormones that drive cravings for high-calorie foods. If you’re doing everything right with diet and exercise but sleeping poorly, you’re working against yourself. Prioritizing consistent sleep of seven to eight hours is one of the most underrated tools for managing blood sugar.
Smoking and Alcohol
Smoking directly increases insulin resistance and is an independent risk factor for type 2 diabetes. If you smoke, quitting is one of the highest-impact changes you can make for your metabolic health, on top of all its other benefits.
Alcohol is trickier. Moderate drinking (one drink per day for women, two for men) hasn’t been shown to worsen prediabetes for most people, but alcohol contains calories that can stall weight loss, and mixed drinks or beer can spike blood sugar. If you drink, keeping it minimal and avoiding sugary cocktails is a reasonable approach.
When Medication Enters the Picture
Lifestyle changes are the first-line approach, and they outperform medication in clinical trials. But for some people, a common blood sugar-lowering medication may be recommended alongside those changes. Current guidelines suggest considering it for people who have both elevated fasting glucose and impaired glucose tolerance, plus at least one additional risk factor: a BMI of 35 or higher, a family history of diabetes in a parent or sibling, elevated triglycerides, low HDL cholesterol, high blood pressure, or an A1C above 6.0%.
In the Diabetes Prevention Program, medication reduced diabetes risk by 31%, which is meaningful but significantly less than the 58% reduction from lifestyle changes. It’s not an either-or decision. For people at higher risk, the combination of medication and lifestyle changes provides the strongest protection.
How Often to Get Rechecked
The American Diabetes Association recommends yearly blood testing once you have a prediabetes diagnosis. This typically means an A1C test, though your provider might also check fasting glucose. Annual testing lets you track whether your numbers are improving, holding steady, or creeping toward the diabetic range.
If you’ve made significant lifestyle changes and lost weight, it’s entirely possible for your numbers to return to normal. That doesn’t mean you’re permanently in the clear, since the underlying tendency toward insulin resistance often remains, but it does mean your active risk is much lower. Continuing the habits that got you there is what keeps your numbers down long term.