Losing 5% to 7% of your body weight and getting at least 150 minutes of moderate exercise per week can cut your risk of developing type 2 diabetes by 58%. That’s the core finding from the Diabetes Prevention Program, one of the largest and most influential studies on prediabetes reversal. The good news is that prediabetes responds remarkably well to lifestyle changes, and the steps involved are straightforward even if they take effort.
Know Your Numbers First
Prediabetes is defined by blood sugar levels that are elevated but not yet in the diabetes range. Three tests can identify it:
- A1C: 5.7% to 6.4% (normal is below 5.7%)
- Fasting blood sugar: 100 to 125 mg/dL (normal is below 100)
- Oral glucose tolerance test: 140 to 199 mg/dL two hours after drinking a glucose solution
These numbers matter because they give you a baseline. As you make changes, retesting your A1C every three to six months lets you see whether your blood sugar is actually improving. If your levels have been stable and trending downward, testing every six months is typical. If you’re still working toward your target, every three months gives you more useful feedback.
Aim for 5% to 7% Weight Loss
You don’t need to hit an ideal body weight to make a meaningful difference. The Diabetes Prevention Program set a goal of losing 5% to 7% of starting body weight within the first six months, and that modest amount was enough to dramatically lower diabetes risk. For someone weighing 200 pounds, that’s 10 to 14 pounds.
In the study, about 5% of people in the lifestyle change group developed diabetes each year, compared with 11% in the placebo group. The participants who exercised at least 150 minutes per week were more than four times as likely to return to normal blood sugar levels compared with those who exercised less. Weight loss and exercise worked together, but even partial progress on either front helped.
The weight loss doesn’t need to happen through any particular diet. What matters is creating a sustainable calorie deficit through food choices and activity levels you can maintain over months, not weeks.
Rebuild Your Plate Around Fiber
Fiber is one of the most effective dietary tools for improving insulin sensitivity. It slows the absorption of sugar into your bloodstream, reduces the overall glycemic impact of meals, and helps with weight loss by keeping you full longer. Guidelines recommend 25 to 30 grams per day for blood sugar management, though research suggests pushing toward 35 grams daily may reduce the risk of premature death by 10% to 48% in people with diabetes.
Most people eat far less fiber than that. The best sources are vegetables, beans and lentils, whole fruits (not juice), and whole grains like oats, barley, and brown rice. A practical approach: build each meal around one or two of these categories. A bowl of oatmeal with berries at breakfast, a lentil soup at lunch, and roasted vegetables with dinner gets you close to 30 grams without requiring any special products.
Fiber also helps reduce inflammation, which plays a direct role in insulin resistance. Fat cells produce inflammatory signals that interfere with your body’s ability to use insulin effectively. As you lose weight and eat more fiber, those inflammatory signals decrease, and your cells become more responsive to insulin again. This is one reason the combination of weight loss and dietary changes is more powerful than either alone.
Move for 150 Minutes a Week
The 150-minute weekly target comes up repeatedly in prediabetes research because it works. This means about 30 minutes of moderate-intensity activity on five days a week. “Moderate intensity” is anything that raises your heart rate and makes you breathe harder: brisk walking, cycling, swimming, or even vigorous yard work.
In one study tracking people with prediabetes, 58% of participants hit the 150-minute weekly mark at their one-year follow-up. Those who did were more than four times as likely to have normal blood sugar levels compared with those who fell short. That’s a striking difference for what amounts to about 20 to 30 minutes a day.
Resistance training, such as bodyweight exercises or lifting weights, also improves insulin sensitivity by building muscle tissue that absorbs more glucose from your blood. Combining aerobic exercise with two or three resistance sessions per week gives you the best results, but if you’re starting from zero, simply walking more is a strong first step. The biggest gains come from going from sedentary to somewhat active, not from optimizing an already active routine.
Sleep at Least Seven Hours
Sleep is an underappreciated factor in blood sugar control. Short sleep duration, defined as less than seven hours per night, is significantly associated with insulin resistance and an increased risk of developing diabetes. Even a single night of partial sleep deprivation can measurably increase insulin resistance the next day.
The mechanism works both ways. Poor sleep disrupts the hormones that regulate appetite and blood sugar, making it harder to lose weight and easier to overeat. And prediabetes itself is associated with poorer sleep quality, which can create a cycle that’s hard to break without deliberately prioritizing rest.
Research on sleep-deprived individuals found that glucose tolerance improved only in those who managed to extend their sleep to more than six hours per night, with seven or more hours being the target recommended by the American Academy of Sleep Medicine. People sleeping six hours or fewer per night had both higher diabetes incidence and less success with weight loss. If you’re doing everything else right but consistently sleeping five or six hours, poor sleep may be undermining your progress.
Reduce Simple Carbohydrates
Cutting back on refined carbohydrates, such as white bread, sugary drinks, pastries, and white rice, is one of the most direct ways to lower post-meal blood sugar spikes. These foods break down quickly into glucose and flood your bloodstream faster than your insulin can handle, especially when insulin sensitivity is already compromised.
You don’t need to eliminate carbohydrates entirely. The goal is to swap high-glycemic foods for lower-glycemic alternatives. Brown rice instead of white, whole grain bread instead of white, whole fruit instead of fruit juice. Pairing carbohydrates with protein, fat, or fiber also slows their absorption. An apple with peanut butter, for instance, produces a much gentler blood sugar response than an apple alone.
Sugary beverages deserve special attention because they deliver large amounts of rapidly absorbed sugar with no fiber, fat, or protein to slow it down. Replacing soda, sweetened coffee drinks, and fruit juice with water, unsweetened tea, or sparkling water is one of the simplest high-impact changes you can make.
When Medication Enters the Picture
Lifestyle changes are the first-line treatment for prediabetes, and they outperform medication in most studies. But for certain people, medication may be considered alongside those changes. Current guidelines suggest it for people under 60 with a BMI of 35 or higher, or for those with a history of gestational diabetes. In the Diabetes Prevention Program, medication reduced diabetes risk by less than lifestyle changes did, which is why it’s typically reserved for people at the highest risk.
If your doctor has mentioned medication as an option, it’s not a replacement for the habits described above. It’s an additional tool for people whose risk profile makes lifestyle changes alone less likely to be sufficient.
Putting It All Together
The changes that reverse prediabetes reinforce each other. Exercise helps with weight loss, which reduces inflammation, which improves insulin sensitivity. Better sleep supports appetite regulation, which makes dietary changes easier to sustain. More fiber keeps blood sugar stable between meals, which reduces cravings for simple carbohydrates.
Start with whichever change feels most achievable. For many people, that’s walking 30 minutes a day or cutting sugary drinks. Small changes compound. The Diabetes Prevention Program participants didn’t overhaul their lives overnight. They made incremental changes over six months and saw results that lasted years. Your A1C at your next blood test will tell you whether what you’re doing is working, and three to six months is enough time to see measurable improvement.