If you’ve been told your blood sugar is in the prediabetic range, the most important thing to know is that this is reversible. Losing 5% to 7% of your body weight through better eating and regular movement cuts your risk of developing type 2 diabetes by 58%. For someone weighing 200 pounds, that’s 10 to 14 pounds. Prediabetes is not a guarantee of anything. It’s a warning with a clear, proven path back to normal.
About 115 million American adults have prediabetes, and 8 in 10 of them don’t know it. If you do know, you’re already ahead. Here’s what actually works.
What Prediabetes Means for Your Body
Prediabetes means your blood sugar is higher than normal but not high enough to qualify as type 2 diabetes. Your body is starting to struggle with insulin, the hormone that moves sugar from your blood into your cells. Either your cells are becoming resistant to insulin’s signal, or your pancreas isn’t producing quite enough of it. The result is sugar building up in your bloodstream instead of being used for energy.
Three tests can identify it. An A1C between 5.7% and 6.4% indicates prediabetes. A fasting blood sugar between 100 and 125 mg/dL does the same. And if you take a glucose tolerance test (where you drink a sugary solution and get tested two hours later), a result between 140 and 199 mg/dL falls in the prediabetic range. You should be retested annually once you have a prediabetes diagnosis to track whether your numbers are improving, holding steady, or climbing.
Weight Loss Is the Single Biggest Lever
The landmark Diabetes Prevention Program, a large clinical trial funded by the National Institutes of Health, found that people who lost 5% to 7% of their body weight and exercised 150 minutes per week reduced their diabetes risk by 58%. For people over 60, the reduction was even larger: 71%. And the benefits persisted. Fifteen years later, participants still had a 27% lower rate of type 2 diabetes compared to those who made no changes.
For most people, that target means losing roughly 10 to 20 pounds. You don’t need to reach an ideal weight. Even modest fat loss, especially around the midsection, meaningfully improves how your body handles insulin. The goal isn’t perfection. It’s getting your metabolism moving in the right direction.
How to Change What You Eat
You don’t need a complicated meal plan. The core principle is simple: replace refined carbohydrates with fiber-rich whole foods, and build meals around vegetables, lean protein, and healthy fats.
Start with the carbohydrates that spike your blood sugar fastest. White bread, white rice, white pasta, and sugary drinks are the biggest offenders. Swap white rice for brown rice, farro, or quinoa. Choose whole grain bread over white. Eat whole fruit instead of drinking fruit juice, since the fiber in whole fruit slows sugar absorption. Canned fruit and juice often contain added sugar that hits your bloodstream quickly. Aim for 25 to 30 grams of fiber per day by eating a variety of vegetables, fruits, whole grains, and legumes. When buying cereal, look for at least 5 grams of fiber per serving.
A useful plate structure: fill half your plate with non-starchy vegetables, a quarter with lean protein (chicken, fish, beans, tofu), and a quarter with a whole grain or starchy vegetable. This naturally controls portions and slows the blood sugar response after eating.
The DASH diet, originally designed to lower blood pressure, is also well-suited for prediabetes. It emphasizes fruits, vegetables, whole grains, low-fat dairy, legumes, and nuts while limiting sodium, saturated fat, and refined sugar. If you’re looking for a framework rather than building a plan from scratch, DASH or a Mediterranean-style diet are both strong starting points.
The Exercise Target That Matters
The number to remember is 150 minutes per week of moderate-intensity activity. That’s 30 minutes a day, five days a week. Brisk walking counts. So does cycling, swimming, yard work, or anything that raises your heart rate enough that you can talk but not sing. This is the same amount of exercise used in the Diabetes Prevention Program trial that produced the 58% risk reduction.
You don’t need to do it all at once. Three 10-minute walks spread throughout the day are just as effective as one 30-minute session. Walking after meals is particularly useful because it helps your muscles absorb blood sugar right when it’s peaking. Adding resistance training (bodyweight exercises, resistance bands, or weights) at least twice a week builds muscle mass, which improves your body’s ability to use insulin around the clock since muscle tissue is one of the primary places your body stores glucose.
If you’re currently sedentary, start where you are. Even small increases in movement produce measurable improvements in insulin sensitivity. The jump from zero to something matters more than the jump from something to optimal.
Why Sleep and Stress Affect Blood Sugar
Poor sleep directly worsens insulin resistance. Research published in The Journal of Clinical Endocrinology & Metabolism found that even a single night of sleep deprivation is enough to reduce insulin sensitivity in healthy people. When you’re chronically short on sleep, your body overactivates its stress response system, flooding your bloodstream with hormones that raise blood sugar and make your cells less responsive to insulin. Aim for 7 to 8 hours per night. If you consistently get less than 6, improving your sleep may be one of the most impactful changes you can make.
Chronic stress works through a similar pathway. When you’re stressed, your body releases cortisol, which signals your liver to dump stored sugar into your bloodstream as part of the fight-or-flight response. That’s useful if you’re running from danger. It’s counterproductive if you’re sitting at a desk worrying about a deadline. Regular physical activity, consistent sleep schedules, and even basic relaxation practices like deep breathing or spending time outdoors can lower baseline cortisol levels over time.
When Medication Enters the Picture
Lifestyle changes are the first-line treatment for prediabetes, but some people benefit from medication as well. Metformin, a widely used diabetes drug, has been shown to reduce the progression from prediabetes to type 2 diabetes. Clinical trials found it was most effective in people under 60, those with a BMI over 35, and women with a history of gestational diabetes. It works by reducing the amount of sugar your liver releases and improving how your cells respond to insulin.
Metformin isn’t prescribed to everyone with prediabetes. It’s typically considered when someone has multiple risk factors or when lifestyle changes alone haven’t moved the numbers enough. If your doctor hasn’t brought it up, that likely means your situation is manageable with diet and exercise. If your A1C is creeping upward despite real effort, it’s worth asking about.
What Improvement Looks Like
Prediabetes doesn’t reverse overnight, but changes in blood sugar can show up within weeks of consistent effort. You’ll typically see the most dramatic improvement in the first three to six months. Your A1C, which reflects your average blood sugar over roughly three months, is the best marker of progress. Getting it below 5.7% means you’ve moved out of the prediabetic range.
Some people achieve this through weight loss alone. Others need the full combination of dietary changes, regular exercise, better sleep, and sometimes medication. The specific path matters less than the trajectory. If your numbers are moving downward, you’re doing the right things. If they’re stable or rising after six months of genuine effort, it’s time to talk with your doctor about adjusting the approach.