Prediabetes is controllable, and in many cases reversible, through a combination of weight loss, dietary changes, regular exercise, and better sleep. An A1C between 5.7% and 6.4% places you in the prediabetes range, but the Diabetes Prevention Program study found that lifestyle changes alone reduced the progression to type 2 diabetes by 27% over 15 years of follow-up. That’s more effective than medication, which reduced it by 18%.
The changes required aren’t extreme. They’re specific, measurable, and well-studied. Here’s what actually moves the needle.
Lose 7% of Your Body Weight
Weight loss is the single most impactful lever for controlling prediabetes. The American Diabetes Association recommends losing at least 7% of your body weight. For someone who weighs 200 pounds, that’s 14 pounds. For someone at 170 pounds, it’s about 12 pounds. That target was chosen because it’s realistic to achieve and maintain, and it meaningfully lowers the risk of developing type 2 diabetes.
You don’t need to hit this number overnight. A structured 16-week lifestyle modification program is the typical starting framework, and if weight hasn’t budged after that period, your doctor may consider adding medication to help. The goal is steady, sustained loss rather than a crash diet that rebounds.
Build Your Plate Around Fiber and Healthy Fats
A Mediterranean-style eating pattern is one of the best-studied approaches for blood sugar control. It emphasizes foods that slow down glucose absorption: high-fiber vegetables, legumes, whole grains, nuts, and healthy fats like olive oil and fatty fish. These foods break down more slowly and steadily, which prevents the sharp blood sugar spikes that stress your insulin response.
The specific fiber target for people with prediabetes is 35 grams per day, or an increase of at least 15 grams over your current intake. Most Americans eat around 15 grams daily, so this typically means doubling what you’re eating now. Practical ways to get there include adding lentils or chickpeas to meals, switching to whole grains like oats, quinoa, or farro, and eating more non-starchy vegetables like broccoli, spinach, and zucchini.
Foods that have been linked to improved insulin signaling and lower A1C levels include berries, leafy greens, and extra virgin olive oil. A useful grocery list to build around:
- Non-starchy vegetables: spinach, broccoli, zucchini, eggplant
- Whole grains: quinoa, bulgur, farro, oats
- Legumes: lentils, chickpeas, black beans
- Fruits: berries, apples, citrus, pears
- Healthy fats: extra virgin olive oil, avocado, walnuts
- Lean protein: fish, skinless poultry, tofu
You don’t need to follow the Mediterranean diet by name. The principle is the same regardless of cuisine: prioritize whole foods, replace refined carbohydrates with fiber-rich ones, and include healthy fats at most meals to moderate your blood sugar response.
Get 150 Minutes of Activity Per Week
The CDC recommends at least 150 minutes per week of moderate-intensity physical activity for blood sugar management. That breaks down to about 30 minutes five days a week. Brisk walking, cycling, swimming, and dancing all count. The bar for “moderate intensity” is simple: you can talk but not sing during the activity.
What makes exercise so effective for prediabetes is its direct mechanism. Physical activity triggers your muscle cells to pull glucose out of the bloodstream, independent of insulin. This means exercise lowers blood sugar even when your insulin isn’t working efficiently, which is the core problem in prediabetes.
Why Strength Training Matters Too
Cardio gets most of the attention, but resistance training (lifting weights, using resistance bands, or doing bodyweight exercises) plays a distinct role. Strength training builds muscle mass, and muscle tissue is the primary destination for glucose clearance from your blood. More muscle means more capacity to absorb blood sugar. It also appears to increase the signaling proteins involved in glucose transport into cells. Adding two to three sessions per week alongside your cardio is a practical target.
Sleep at Least Seven Hours a Night
Sleep is an underappreciated factor in blood sugar control. Sleeping fewer than seven hours per night increases the risk of developing insulin resistance, the underlying driver of prediabetes. The connection runs partly through cortisol: total sleep deprivation raises cortisol levels, and chronically elevated cortisol impairs your body’s ability to process glucose.
Seven hours is the minimum threshold where this risk drops. If you’re doing everything else right but consistently sleeping five or six hours, your body is working against you metabolically. Prioritizing sleep hygiene (consistent bedtime, cool and dark room, limited screens before bed) is a legitimate part of a prediabetes management plan, not a bonus.
What About Medication?
Lifestyle changes are the first-line treatment for prediabetes and outperform medication in long-term studies. Over 15 years, the Diabetes Prevention Program found that lifestyle intervention reduced diabetes incidence by 27%, compared to 18% for metformin. But medication isn’t off the table.
Your doctor may consider metformin if you have a BMI of 25 or higher and haven’t achieved weight loss after a structured 16-week lifestyle program. The studies that established metformin’s effectiveness in prediabetes enrolled adults ranging from their late 20s to early 60s, with an average BMI in the mid-30s. It’s typically a conversation for people who are at higher risk or who need additional support beyond diet and exercise alone.
How Quickly You Can Expect Results
Prediabetes doesn’t reverse in a week, but 16 weeks of consistent lifestyle changes is the standard timeframe used in clinical programs. That’s roughly four months. Since A1C reflects your average blood sugar over the previous two to three months, a retest after 12 to 16 weeks of sustained changes will typically show whether you’re moving in the right direction.
Some people return to a normal A1C (below 5.7%) within this window. Others see meaningful improvement that keeps them out of the diabetes range even if their numbers don’t fully normalize. The key variable is consistency. A 7% weight loss combined with 150 minutes of weekly exercise and a fiber-rich diet is the combination that has the strongest evidence behind it, and each component reinforces the others. Losing weight improves insulin sensitivity. Exercise builds the muscle that absorbs blood sugar. Better food choices moderate the glucose entering your bloodstream in the first place. Together, they change the trajectory.