Prediabetes is reversible, and the single most effective thing you can do is lose a moderate amount of weight. Losing just over 5% of your body weight through diet and exercise changes leads to a 73% reduction in the risk of developing type 2 diabetes. That means a 200-pound person needs to lose roughly 10 to 12 pounds to dramatically shift their trajectory. The changes required aren’t extreme, but they do need to be consistent.
What’s Actually Happening in Your Body
Prediabetes means your blood sugar is elevated but hasn’t crossed into diabetic territory. The numbers that define it: a fasting blood glucose between 100 and 125 mg/dL, or an A1C between 5.7% and 6.4%. Normal fasting glucose is below 100, and normal A1C is below 5.7%. Once you hit 126 fasting or 6.5% A1C, that’s diabetes.
The core problem is that your cells are becoming resistant to insulin, the hormone that moves sugar out of your blood and into your cells for energy. At the same time, the insulin-producing cells in your pancreas start to struggle. A 2025 study published in The Lancet Diabetes & Endocrinology found that the single strongest predictor of whether someone reversed their prediabetes was recovery of these insulin-producing cells. The good news: at this stage, the damage is not permanent. Weight loss and exercise can restore both insulin sensitivity and the function of those cells, which is much harder to accomplish once full diabetes sets in.
How Much Weight You Need to Lose
The threshold that matters most in the research is 5% of your body weight. Getting past that mark is where prediabetes remission, meaning a return to normal blood sugar, becomes likely. The landmark Diabetes Prevention Program trial tracked participants for 10 years and found that lifestyle changes (primarily weight loss through diet and exercise) reduced diabetes incidence by 34% compared to a control group. That benefit persisted a full decade later, even as some participants regained weight over time.
You don’t need to reach an “ideal” weight. The protective effect kicks in with modest loss and increases from there. For most people, aiming for 5% to 7% over six months to a year is realistic and sufficient.
What to Eat
No single diet has proven clearly superior for prediabetes reversal. A randomized crossover trial comparing a very low-carb (ketogenic) diet to a Mediterranean-style diet found that both reduced A1C by similar amounts over 12 weeks: roughly 7% to 9% decreases. The low-carb approach did produce slightly lower average blood sugar readings on continuous glucose monitors, but the difference in A1C, the number that actually defines your diagnosis, was not statistically significant between the two.
What this tells you is that the best diet is the one you’ll actually stick with. That said, a few principles consistently show up across the research:
- Prioritize fiber. Aim for 25 to 30 grams per day from vegetables, fruits, legumes, and whole grains. Fiber slows the absorption of sugar into your bloodstream, which blunts the blood sugar spikes that stress your insulin system. Most Americans eat about half this amount.
- Cut refined carbohydrates. White bread, sugary drinks, pastries, and processed snacks cause rapid blood sugar spikes. Swapping these for whole grain versions or protein-rich alternatives makes a measurable difference.
- Build meals around protein and produce. Filling half your plate with non-starchy vegetables and a quarter with protein naturally reduces the carbohydrate load of each meal without requiring you to count anything.
Calorie reduction matters because it drives the weight loss that restores insulin function. But focusing on food quality, rather than strict calorie counting, tends to produce more sustainable results for most people.
The Exercise Target
The CDC recommends at least 150 minutes per week of moderate-intensity physical activity. That’s 30 minutes a day, five days a week. “Moderate intensity” means brisk walking, cycling on flat terrain, swimming, or anything that gets your heart rate up enough that you can talk but not sing.
Exercise improves blood sugar control through two separate mechanisms. During activity, your muscles pull glucose directly from the blood without needing insulin, which immediately lowers blood sugar. Over weeks and months, regular exercise also makes your cells more responsive to insulin at rest, addressing the root cause of prediabetes. Strength training, such as bodyweight exercises, resistance bands, or weight lifting, adds further benefit by increasing muscle mass, which acts as a larger “sponge” for absorbing blood glucose. Even two sessions a week of strength work alongside your cardio makes a difference.
If you’re currently sedentary, you don’t need to start at 150 minutes. Even 10-minute walks after meals have been shown to reduce post-meal blood sugar spikes. Build up gradually over several weeks.
Sleep and Stress Matter More Than You Think
Short sleep directly worsens insulin resistance through several overlapping pathways. Sleeping fewer than six hours raises cortisol levels (your body’s stress hormone), triggers the sympathetic nervous system into a heightened state, and alters hormones that regulate appetite and fat storage. These changes impair how well insulin works in your muscles and fat tissue. In practical terms, poor sleep can undermine your diet and exercise efforts by making your body less efficient at processing sugar and by increasing cravings for high-calorie foods.
Chronic stress operates through similar hormonal pathways, keeping cortisol elevated and pushing blood sugar higher. You don’t need a meditation practice or a perfect eight hours every night, but consistently getting seven or more hours of sleep and finding even basic ways to manage stress (regular physical activity itself is one of the most effective) supports everything else you’re doing.
Whether Medication Makes Sense
Current guidelines suggest that medication may be considered for people with prediabetes who have additional high-risk factors: younger age combined with obesity, blood sugar readings at the higher end of the prediabetic range, or a history of gestational diabetes. In the Diabetes Prevention Program trial, medication reduced 10-year diabetes incidence by 18%, compared to 34% for lifestyle changes alone. Lifestyle intervention was nearly twice as effective.
For most people with prediabetes, diet and exercise changes are the first and most powerful intervention. Medication is typically a conversation for people who have tried lifestyle changes without sufficient progress or who have multiple compounding risk factors.
Tracking Your Progress
The A1C test is the standard way to monitor whether your changes are working. It reflects your average blood sugar over the previous two to three months, so it captures the overall trend rather than day-to-day fluctuations. For people with prediabetes, testing once a year is the typical recommendation. Your goal is to get your A1C below 5.7%, which is the threshold for normal blood sugar regulation.
Fasting glucose tests can also track progress and may be done at routine checkups. If your fasting glucose drops below 100 mg/dL and stays there, that’s a strong signal your insulin system is recovering. Weight loss itself is a useful proxy in between lab tests. If the scale is moving in the right direction, your blood sugar likely is too.
The most important thing to understand about prediabetes is that it responds to intervention better than almost any other chronic condition. The majority of people who make sustained, moderate changes to how they eat, move, and sleep can return to normal blood sugar levels. The window for doing so is now, before the pancreas sustains more lasting damage.