Prediabetes is highly controllable, and in many cases reversible, through lifestyle changes alone. A major study found that 93% of adults who made lifestyle changes after a prediabetes diagnosis did not progress to type 2 diabetes, and about 43% returned to completely normal blood sugar levels. The core strategy comes down to modest weight loss, regular physical activity, and smarter eating habits.
What Prediabetes Actually Means
Prediabetes means your blood sugar is higher than normal but not yet in the diabetes range. It’s diagnosed when your A1C (a measure of average blood sugar over two to three months) falls between 5.7% and 6.4%. Below 5.7% is normal, and 6.5% or above is diabetes. The USPSTF recommends screening for adults aged 35 to 70 who are overweight or obese, with repeat testing every three years if results come back normal.
The good news is that prediabetes is the stage where intervention works best. Your body still produces insulin and responds to it, just not as efficiently as it should. That gap between “not quite normal” and “diabetes” is where lifestyle changes have the most power.
Lose 5 to 7% of Your Body Weight
This is the single most effective lever. Losing just 5 to 7% of your body weight, combined with regular exercise, reduces the risk of developing type 2 diabetes by 58%. For someone who weighs 200 pounds, that’s 10 to 14 pounds. You don’t need to reach an ideal weight or drop several clothing sizes. A modest, sustained loss is what moves the needle on insulin sensitivity.
The key word is sustained. Crash diets that produce rapid weight loss followed by regain don’t offer the same protection. Focus on a calorie reduction you can maintain over months and years, not weeks. Even small daily changes, like cutting out sugary drinks or reducing portion sizes at one meal, compound over time.
Get 150 Minutes of Activity Per Week
The target is 150 minutes of moderate-intensity physical activity each week. That breaks down to about 30 minutes on most days. “Moderate intensity” means activity that raises your heart rate and makes you breathe harder but still lets you carry on a conversation: brisk walking, cycling, swimming, or even vigorous yard work all count.
Exercise improves blood sugar control in two ways. During activity, your muscles pull glucose from your bloodstream for fuel without needing as much insulin. Over time, regular exercise also makes your cells more responsive to insulin, reducing resistance. Strength training (bodyweight exercises, resistance bands, or weights) adds further benefit by building muscle tissue, which is metabolically active and helps regulate glucose even at rest. Aim to include strength exercises at least two days per week alongside your aerobic activity.
If 30 minutes feels like too much at first, shorter bouts of 10 to 15 minutes still help. A walk after meals is especially effective because it blunts the blood sugar spike that follows eating.
Rethink Carbohydrates Instead of Eliminating Them
You don’t need to go low-carb to manage prediabetes, but you do need to be selective about which carbohydrates you eat. Foods that are digested slowly, those with a low glycemic index, cause a gentler rise in blood sugar compared to refined grains, white bread, and sugary foods that spike it quickly.
Practical swaps make a big difference: whole grain bread instead of white, steel-cut oats instead of instant, sweet potatoes instead of regular potatoes, and whole fruit instead of fruit juice. These foods tend to be higher in fiber, which slows digestion and blunts glucose spikes. The federal dietary guidelines recommend 22 to 34 grams of fiber daily depending on age and sex, but most Americans get about half that.
Good sources of fiber include beans, lentils, vegetables, whole grains, nuts, and seeds. Pairing carbohydrates with protein or healthy fat at each meal also slows absorption. An apple with peanut butter, for instance, produces a smaller blood sugar rise than an apple alone. Building meals around a base of non-starchy vegetables (leafy greens, broccoli, peppers, tomatoes) naturally reduces the proportion of fast-digesting carbs on your plate.
Prioritize Sleep
Sleep is an underappreciated factor in blood sugar control. A Columbia University study found that cutting sleep by just 90 minutes per night for six weeks increased insulin resistance by nearly 15% overall. Among postmenopausal women, resistance jumped by more than 20%. Fasting insulin levels rose by over 12%. These changes happened independently of body fat, meaning poor sleep disrupts glucose metabolism even without weight gain.
Most adults need seven to nine hours per night. If you’re consistently getting less than seven, improving your sleep may be one of the fastest ways to improve your insulin sensitivity. Keeping a consistent bedtime, limiting screens before sleep, and avoiding caffeine in the afternoon are simple starting points.
Track Your Progress
Your A1C is the best overall measure of whether your efforts are working. Most doctors will recheck it every three to six months after a prediabetes diagnosis. The goal is to bring it below 5.7%, or at least prevent it from climbing toward 6.5%.
Continuous glucose monitors, small sensors worn on the arm that track blood sugar in real time, are generating interest as tools for people with prediabetes. They can show you exactly how specific foods, exercise, sleep, and stress affect your glucose levels throughout the day. While they aren’t yet a standard recommendation for prediabetes, early evidence suggests they could help personalize lifestyle changes by giving immediate feedback. If you’re curious, ask your doctor whether a short trial period might be useful for learning your body’s patterns.
When Lifestyle Changes Aren’t Enough
For most people, the combination of weight loss, exercise, and dietary changes is sufficient to control prediabetes. However, the American Diabetes Association guidelines note that medication may be considered for certain higher-risk individuals: adults aged 25 to 59 with a BMI above 35, those with a fasting glucose above 110, an A1C above 6%, or women who had gestational diabetes. In these cases, medication works alongside lifestyle changes rather than replacing them.
The most important thing to understand about prediabetes is that it responds to action. The Diabetes Prevention Program and subsequent studies have consistently shown that lifestyle intervention outperforms medication alone in preventing progression to type 2 diabetes. Starting early matters, but even people who had prediabetes for several years before making changes saw significant benefit. Nearly half of participants in one study who began lifestyle changes up to eight years after their diagnosis still returned to normal blood sugar levels.