Prediabetes is reversible, and the most effective approach is straightforward: lose a modest amount of weight, move more, and change what you eat. Data from the Diabetes Prevention Program, one of the largest studies on this topic, shows that losing about 7% of your body weight and walking 30 minutes a day, five days a week, reduces the risk of progressing to type 2 diabetes by 58%. That’s a better result than medication alone.
Prediabetes means your blood sugar is elevated but not yet in the diabetic range. An A1C between 5.7% and 6.4%, or a fasting blood glucose between 100 and 125 mg/dL, puts you in this category. Roughly 46% of people who make structured lifestyle changes convert back to normal blood sugar levels. The changes aren’t extreme, but they need to be consistent.
How Much Weight You Actually Need to Lose
The target is 7% of your current body weight. If you weigh 200 pounds, that’s 14 pounds. If you weigh 170 pounds, it’s about 12 pounds. This is not a dramatic transformation, and you don’t need to reach an “ideal” weight to see results. Even partial progress toward that 7% goal improves how your body handles insulin.
Crash diets aren’t the point here. A steady loss of one to two pounds per week through a modest calorie reduction is what the clinical trials used. The people who kept the weight off years later were the ones who paired eating changes with regular physical activity, not those who relied on diet alone.
What to Eat (and What to Cut)
The single most impactful dietary change is reducing the total amount of carbohydrate your body has to process at any given time. This doesn’t mean eliminating carbs entirely. It means choosing ones that release sugar into your bloodstream slowly and eating them in reasonable portions.
Foods with a low glycemic index, like beans, lentils, most vegetables, and whole intact grains, cause a gradual rise in blood sugar. Foods with a high glycemic index, like white bread, white rice, and sugary cereals, cause a sharp spike. But the total carbohydrate in a meal matters more than the glycemic index of any single food. A small serving of watermelon, despite having a high glycemic index, barely affects blood sugar because it contains so little carbohydrate per serving. A large bowl of brown rice, despite being a “healthy” grain, can still push your blood sugar up simply because of the volume.
Fiber is your strongest ally. The Dietary Guidelines for Americans recommend 22 to 34 grams per day depending on your age and sex, but most people get far less. Fiber slows the absorption of sugar, helps you feel full, and improves insulin sensitivity over time. Good sources include beans, lentils, vegetables, berries, nuts, seeds, and whole grains like oats and barley. Building meals around a protein, a non-starchy vegetable, and a fiber-rich carb source is a practical framework that works without calorie counting.
Sugary drinks deserve special attention. People who consume more than three servings of sugar-sweetened beverages per week have a 46% higher risk of developing prediabetes compared to people who drink none. This includes soda, sweet tea, fruit punch, and many coffee drinks. Liquid sugar hits your bloodstream fast and doesn’t trigger the same fullness signals as solid food, making it easy to consume far more sugar than you realize.
The Exercise Target
The goal is 150 minutes of moderate-intensity physical activity per week. Walking briskly counts. So does cycling, swimming, dancing, or yard work that gets your heart rate up. Spread across five days, that’s 30 minutes a day.
You don’t need to start at 150 minutes. If you’re currently sedentary, even 10-minute walks after meals can lower post-meal blood sugar spikes noticeably. Build up gradually. The key is consistency over intensity. Adding some form of resistance exercise, like bodyweight squats, resistance bands, or light weights, helps your muscles absorb glucose more efficiently, which directly addresses the insulin resistance driving your prediabetes.
Exercise improves blood sugar even on days when the scale doesn’t move. A single session of moderate activity increases insulin sensitivity for 24 to 48 hours afterward, which is why daily or near-daily movement matters more than occasional intense workouts.
Sleep and Stress Matter More Than You Think
Sleeping only five hours a night for one week measurably reduces insulin sensitivity in otherwise healthy people. This isn’t about feeling tired. Short sleep directly impairs how your cells respond to insulin, making your body worse at clearing sugar from the blood regardless of what you eat.
Sleep restriction also raises cortisol, your body’s primary stress hormone, along with adrenaline levels. While researchers haven’t pinpointed the exact chain of events connecting poor sleep to insulin resistance, the effect itself is consistent and significant. Aiming for seven to eight hours of sleep per night supports every other change you’re making.
Chronic stress operates through similar pathways. Sustained high cortisol levels keep blood sugar elevated. You don’t need a meditation retreat, but finding reliable ways to manage stress, whether that’s regular exercise, time outdoors, social connection, or simply protecting your sleep schedule, directly supports blood sugar control.
When Medication Enters the Picture
Lifestyle changes are the first-line treatment for prediabetes, but medication is an option in certain situations. Metformin, a drug that reduces the amount of sugar your liver releases into your bloodstream, is sometimes recommended alongside lifestyle changes. It’s particularly effective for people with a history of gestational diabetes, where it reduces the risk of progressing to type 2 diabetes by 50%, matching the effect of lifestyle changes alone.
The American Diabetes Association and the U.S. Preventive Services Task Force both suggest that lifestyle interventions, metformin, or a combination of both are appropriate for people with prediabetes. Your doctor will consider factors like your BMI, age, and how elevated your blood sugar is when deciding whether medication makes sense for you.
How to Track Your Progress
If you have prediabetes and are making lifestyle changes, an A1C test once a year is the standard monitoring schedule. This gives your body enough time to respond to the changes you’ve made. Your A1C reflects your average blood sugar over the previous two to three months, so testing more frequently than every three months wouldn’t capture meaningful change.
The numbers you’re watching for: an A1C below 5.7% means you’ve returned to the normal range. Staying between 5.7% and 6.4% means you’re still in the prediabetic range but may be trending in the right direction. An A1C of 6.5% or higher on two separate tests indicates type 2 diabetes.
Beyond the lab numbers, pay attention to practical markers. Are your clothes fitting differently? Can you walk farther without getting winded? Are you sleeping better? These changes often show up before the A1C moves, and they reflect the metabolic improvements happening beneath the surface. In a large review of randomized trials following over 5,000 people with prediabetes for two to six years, structured lifestyle changes cut the rate of progression to diabetes by 42%. The earlier and more consistently you act, the better those odds become.