Losing 5% to 7% of your body weight through diet and exercise changes is the single most effective natural strategy for lowering A1C in the prediabetes range. For someone weighing 200 pounds, that means losing 10 to 14 pounds. In clinical trials, people with prediabetes who lost more than 5% of their body weight returned to normal blood sugar levels 43% of the time, and those who achieved that remission had a 73% lower risk of ever developing type 2 diabetes. The changes that get you there are specific and well-studied.
Where Your A1C Stands
A1C measures your average blood sugar over the past two to three months, expressed as a percentage. Normal is below 5.7%. Prediabetes falls between 5.7% and 6.4%. At 6.5% or above, the diagnosis shifts to type 2 diabetes. Your goal is to push that number back below 5.7%, and the lifestyle changes below have been shown to do exactly that when applied consistently.
Why Weight Loss Matters Most
Weight loss improves how your body responds to insulin, which is the core problem driving elevated A1C. Current guidelines recommend people with prediabetes aim to lose at least 7% of their body weight. That target was chosen because it’s realistic to achieve and maintain, and it produces meaningful reductions in diabetes risk. In one large analysis combining data from multiple prevention trials, people who hit the 7% weight loss target and returned to normal blood sugar levels cut their risk of developing type 2 diabetes by 76% over six years.
You don’t need to hit that number overnight. Losing one to two pounds per week through a modest calorie deficit is sustainable and effective. The key is that the weight stays off. Crash diets that lead to regain don’t produce lasting A1C improvements.
Move for 150 Minutes a Week
Structured lifestyle programs that combine at least 150 to 175 minutes of moderate-to-vigorous physical activity per week with dietary changes have reduced the risk of progressing to type 2 diabetes by 40% to 70%. That works out to about 30 minutes of brisk walking, cycling, or swimming five days a week. Spread your activity over at least three days, and avoid going more than two consecutive days without exercise.
Resistance training adds a separate benefit. Lifting weights, using resistance bands, or doing bodyweight exercises two to three times per week on nonconsecutive days improves how your muscles absorb glucose from your bloodstream. This matters because skeletal muscle is the largest consumer of blood sugar in your body. The combination of aerobic exercise and resistance training outperforms either one alone.
Choose Low Glycemic Foods
Switching from high glycemic index foods to low glycemic alternatives lowers A1C by about 0.5 percentage points on average. That might sound modest, but for someone sitting at 6.0%, it could mean the difference between prediabetes and a normal result. High glycemic foods, like white bread, white rice, sugary cereals, and potatoes, cause rapid blood sugar spikes. Low glycemic alternatives, like steel-cut oats, legumes, most vegetables, and whole intact grains, release glucose more slowly.
The glycemic index isn’t something you need to memorize for every food. A practical rule: the less processed a carbohydrate is, the lower its glycemic impact. Swapping white rice for brown rice, juice for whole fruit, and instant oatmeal for rolled or steel-cut oats makes a measurable difference over weeks and months.
Eat More Fiber
Most adults with prediabetes eat far less fiber than they should. Guidelines recommend 25 to 30 grams per day, but research suggests pushing toward 35 grams daily offers even greater protection, reducing the risk of premature death in people with diabetes by 10% to 48%. Fiber slows the absorption of sugar into your bloodstream, blunts post-meal glucose spikes, and feeds beneficial gut bacteria that play a role in metabolic health.
Getting to 35 grams takes intention. A cup of cooked lentils provides about 15 grams. A cup of raspberries adds 8. A serving of black beans gives you around 7. Building meals around vegetables, legumes, nuts, and whole grains rather than treating them as side dishes is the most reliable way to hit that target without supplements.
Time-Restricted Eating
Intermittent fasting, particularly the pattern of eating within an 8-hour window and fasting for 16 hours, has shown benefits for prediabetes that go beyond simple calorie reduction. In studies comparing intermittent fasting to standard calorie restriction with the same total calorie intake, the fasting groups saw greater reductions in fasting blood sugar, body weight, and waist circumference. Early time-restricted feeding, where you eat earlier in the day and stop by mid-afternoon, produced additional improvements in insulin sensitivity, blood pressure, and oxidative stress.
This approach isn’t necessary if the other strategies are working for you, but it can be a useful tool if you find traditional calorie counting difficult to sustain. The metabolic benefits appear to come partly from aligning your eating window with your body’s natural insulin sensitivity, which peaks earlier in the day.
Sleep at Least Seven Hours
Short sleep directly undermines your ability to manage blood sugar. The American Academy of Sleep Medicine recommends a minimum of seven hours per night for adults. Sleeping less than that triggers a stress response: your body releases more cortisol, a hormone that raises blood sugar and makes your cells less responsive to insulin. Over time, chronic short sleep creates the exact metabolic conditions that push A1C higher.
This isn’t just about feeling rested. Studies have found that sleep deprivation worsens insulin resistance even in people who are otherwise healthy and at a normal weight. If you’re doing everything else right but consistently sleeping six hours or less, poor sleep could be the factor stalling your progress.
Replace Sugary Drinks With Water
Drinking more water on its own hasn’t been convincingly shown to lower blood sugar. A large study of young and middle-aged women found no significant association between plain water intake and type 2 diabetes risk after adjusting for diet and lifestyle factors. However, substituting water for sugar-sweetened beverages or fruit juice was associated with a moderately lower risk of type 2 diabetes. The benefit comes from what you stop drinking, not from the water itself. A single 12-ounce can of regular soda contains about 39 grams of sugar, enough to spike blood glucose significantly in someone with impaired insulin function.
What About Supplements
Berberine, a compound found in several plants, has attracted attention for its blood sugar-lowering effects. In a clinical trial of people with newly diagnosed type 2 diabetes, berberine reduced A1C from 9.5% to 7.5% over three months, performing comparably to metformin at the same dose. It also lowered triglycerides and total cholesterol more effectively than metformin in that study. These results are notable, but this trial involved people with full diabetes and significantly elevated A1C levels, not prediabetes. The magnitude of the effect in the prediabetes range is less clear.
Apple cider vinegar is frequently promoted for blood sugar control, but the evidence is weak. A controlled crossover study in healthy adults found that 30 ml of apple cider vinegar consumed with a carbohydrate-rich meal produced no significant difference in blood glucose levels compared to the same meal without vinegar. It may have mild effects in some contexts, but it’s not a reliable tool for lowering A1C.
Putting It Together
The strategies with the strongest evidence all reinforce each other. Exercise makes your cells more sensitive to insulin. Eating fewer processed carbohydrates and more fiber reduces the glucose load your body has to handle. Losing weight shrinks the fat deposits around your liver and pancreas that drive insulin resistance. Sleeping enough keeps your stress hormones from sabotaging the rest of your efforts. No single change works as well as the combination, and the combination, done consistently, works remarkably well. People who achieve all of these targets don’t just slow their progression to diabetes. Nearly half of them reverse prediabetes entirely.