Prediabetes is reversible. Losing 5 to 7 percent of your body weight through diet and exercise reduces the risk of developing type 2 diabetes by 58 percent. That’s roughly 10 to 14 pounds for someone who weighs 200 pounds. The changes that make the biggest difference are straightforward: move more, eat differently, sleep better, and manage stress. Here’s what each of those looks like in practice.
Know Your Numbers First
Prediabetes is defined by an A1C between 5.7% and 6.4%, or a fasting blood glucose between 100 and 125 mg/dL. An A1C at or above 6.5%, or fasting glucose at or above 126 mg/dL, crosses the line into type 2 diabetes. These numbers tell you how effectively your body is processing sugar, and they’re the benchmarks you’ll track over time.
Once you have a prediabetes diagnosis, the CDC recommends repeating your A1C test every one to two years. This gives you a concrete way to measure whether the changes you’re making are working. Many people see their numbers drop back into the normal range within a year or two of consistent lifestyle changes.
Move at Least 150 Minutes a Week
The single most impactful exercise target is 150 minutes of moderate-intensity physical activity per week. That’s about 30 minutes a day, five days a week. “Moderate intensity” means you’re breathing harder than normal but can still hold a conversation: brisk walking, cycling, swimming, or even vigorous yard work all count.
You don’t need to hit 30 minutes in one block. Three 10-minute walks spread across the day deliver similar benefits. Adding strength training, like bodyweight exercises, resistance bands, or weights, helps your muscles absorb glucose more efficiently, which directly lowers blood sugar. Even standing up and walking for a few minutes after meals blunts the blood sugar spike that follows eating.
The Diabetes Prevention Program, a landmark clinical trial, found that lifestyle changes including this level of activity were nearly twice as effective as medication at preventing progression to type 2 diabetes. The lifestyle group saw a 58% reduction in new diabetes cases, compared to 31% in the group taking metformin alone.
Reshape What You Eat
You don’t need a radical diet overhaul. The changes that matter most involve shifting the composition of your meals rather than dramatically cutting calories. Three priorities stand out from the evidence.
Increase Fiber to 25-30 Grams a Day
Fiber slows digestion, which prevents blood sugar from spiking after meals. Most Americans get about 15 grams a day, so reaching the 25 to 30 gram target means making deliberate choices: beans, lentils, oats, berries, broccoli, and whole grains like quinoa or barley. A cup of cooked lentils alone delivers about 15 grams. Swapping white rice for brown rice or white bread for whole grain bread adds fiber without changing the structure of your meals.
Choose Carbs That Digest Slowly
Not all carbohydrates are equal. Foods that break down quickly, like white bread, sugary drinks, and processed snacks, cause rapid blood sugar spikes. Foods that digest slowly, like sweet potatoes, steel-cut oats, and most vegetables, release glucose gradually. You don’t need to eliminate carbs. You need to choose ones that your body can handle without overwhelming its insulin response.
Follow a Mediterranean or DASH Pattern
Among all dietary patterns studied for diabetes prevention, the Mediterranean diet has the strongest track record. Research published in the journal Nutrients found that each point of improvement on a Mediterranean diet scoring system was associated with a 10% lower risk of prediabetes. This pattern emphasizes olive oil, fish, nuts, vegetables, fruits, legumes, and whole grains while limiting red meat, processed foods, and added sugars. The DASH diet, originally designed for blood pressure, produces similar benefits and follows a comparable framework with extra emphasis on low-fat dairy and reduced sodium.
Both patterns work not because of any single food but because they naturally reduce processed carbohydrates, increase fiber, and improve the types of fat you consume. People following a Mediterranean pattern in clinical studies showed lower fasting glucose, reduced insulin resistance, lower inflammation markers, and less visceral fat.
Lose a Modest Amount of Weight
The weight loss target is surprisingly achievable: 5 to 7 percent of your current body weight. For someone at 180 pounds, that’s 9 to 13 pounds. For someone at 220, it’s 11 to 15. This modest loss is enough to meaningfully improve how your body responds to insulin.
You don’t need to reach your “ideal” weight. The clinical evidence behind the 58% risk reduction was based on this small percentage, not on reaching a normal BMI. Losing weight slowly, about one to two pounds per week, through a combination of slightly reduced portions and increased activity tends to be more sustainable than aggressive calorie restriction. The goal is a permanent shift in habits, not a temporary diet.
Prioritize Sleep
Sleep directly affects blood sugar regulation. When you’re sleep-deprived, your body releases more cortisol, a stress hormone that triggers your liver to dump glucose into your bloodstream while simultaneously reducing insulin’s effectiveness. Research in JAMA Network Open used seven to eight hours per night as the reference range for lower diabetes risk, with shorter sleep durations consistently linked to higher rates of type 2 diabetes.
If you’re getting six hours or less, improving sleep may be one of the highest-impact changes you can make. Practical steps include keeping a consistent wake time (even on weekends), limiting screens in the hour before bed, keeping your bedroom cool and dark, and cutting off caffeine by early afternoon. Poor sleep also increases hunger hormones and cravings for high-sugar foods, creating a cycle that makes every other prediabetes strategy harder to follow.
Manage Chronic Stress
Stress raises blood sugar through a direct hormonal pathway. When you’re stressed, cortisol signals your pancreas to reduce insulin and increase glucagon, which pulls stored sugar into your bloodstream. This made sense for our ancestors facing physical threats that required quick energy. For modern chronic stress, like financial pressure, work demands, or relationship tension, it just means persistently elevated blood sugar with nowhere for that glucose to go.
Chronically high cortisol levels are linked to high blood sugar that can progress to type 2 diabetes. Effective countermeasures include regular physical activity (which also reduces cortisol), controlled deep breathing exercises that activate your body’s calming nervous system response, consistent quality sleep, and maintaining supportive social relationships. These aren’t vague wellness suggestions. They directly lower the hormone that’s raising your blood sugar.
When Medication Enters the Picture
For most people with prediabetes, lifestyle changes alone are more effective than medication. But metformin may be considered for specific groups: adults between 25 and 59 with a BMI above 35, a fasting glucose above 110 mg/dL, an A1C above 6%, or women who had gestational diabetes during pregnancy. Even in these cases, metformin is typically used alongside lifestyle changes rather than as a replacement for them. The lifestyle-only approach cut diabetes risk by 58%, while metformin alone achieved a 31% reduction.
Tracking Your Progress
Beyond the A1C retest every one to two years, you can gauge progress through simpler signals. Your fasting glucose, if you check it at home, should trend downward over weeks and months. Your weight will reflect whether your dietary and activity changes are taking hold. Waist circumference is another useful marker, since visceral fat around the midsection is closely tied to insulin resistance. And your energy levels, particularly the afternoon crashes that often accompany blood sugar swings, tend to improve as your glucose regulation stabilizes.
The most important thing to understand about prediabetes is the timeline. It typically takes years to progress to type 2 diabetes, which means you have a real window to change course. The changes don’t need to happen all at once. Starting with one daily walk and one meal swap, then building from there, is exactly how the most successful prevention programs are structured.