Lowering your A1c is achievable through a combination of dietary changes, regular exercise, better sleep, and in some cases, medication. Most adults with diabetes aim for an A1c below 7%, while an A1c between 5.7% and 6.4% falls in the prediabetes range. The good news: each of the strategies below can chip away at that number, and combining them produces the biggest results.
One important thing to understand upfront is timing. A1c reflects your average blood sugar over roughly the last three months, because it measures glucose attached to red blood cells that live about 90 to 100 days. That means any change you make today won’t fully show up on your next lab result for 8 to 12 weeks. This isn’t a reason to wait. It’s a reason to start now and stay consistent.
Choose Foods That Slow Blood Sugar Spikes
The single most impactful dietary shift for lowering A1c is choosing foods that raise blood sugar gradually rather than sharply. Foods with a low glycemic index, like whole grains, legumes, non-starchy vegetables, and most fruits, are digested more slowly and produce a gentler rise in blood sugar compared to white bread, white rice, or sugary drinks. In randomized controlled trials, low-glycemic diets consistently improved A1c more than other dietary approaches, with A1c being one of the parameters showing the greatest benefit.
Fiber plays a major role here. The federal Dietary Guidelines recommend 22 to 34 grams of fiber per day depending on your age and sex, but most Americans get roughly half that. Fiber slows carbohydrate absorption, which blunts the blood sugar spike after meals. Practical ways to increase fiber include swapping white rice for brown or wild rice, adding beans or lentils to soups and salads, snacking on nuts or vegetables instead of crackers, and choosing whole fruit over juice.
You don’t need to eliminate carbohydrates entirely. The goal is to pick carbs that come packaged with fiber and to pair them with protein or healthy fat, which further slows digestion. A bowl of oatmeal topped with walnuts and berries, for example, will affect your blood sugar very differently than a bowl of sweetened cereal.
Lose a Modest Amount of Weight
If you’re carrying extra weight, you don’t need a dramatic transformation to see results. Research on men with prediabetes-range A1c levels (5.6 to 6.4%) found that losing just 4 to 5% of body weight significantly reduced the risk of progressing to diabetes. For someone who weighs 200 pounds, that’s 8 to 10 pounds. For someone at 250, it’s 10 to 12.5 pounds.
Weight loss improves A1c primarily by reducing insulin resistance. When you have less excess fat, especially around the abdomen, your cells respond more readily to insulin, and your body needs less of it to keep blood sugar in range. Even modest losses can meaningfully shift these dynamics.
Combine Aerobic and Resistance Exercise
Exercise lowers blood sugar both immediately (your muscles pull glucose from the bloodstream during activity) and over the long term (regular exercise makes your cells more sensitive to insulin). But the type of exercise matters.
A landmark trial published in JAMA compared aerobic exercise, resistance training, and a combination of both in people with type 2 diabetes. The combination group saw the largest A1c drop: 0.23% in the full analysis and 0.27% among participants who completed the program as designed. Aerobic exercise alone reduced A1c by about 0.08 to 0.12%, and resistance training alone produced similar modest reductions. A broader meta-analysis of multiple trials found an average A1c reduction of 0.80% from structured exercise programs overall.
The study participants exercised about three times per week. A practical routine might look like brisk walking, cycling, or swimming for 20 to 30 minutes on some days, plus bodyweight exercises or light weightlifting on others. The key is consistency over intensity. Three moderate sessions per week, sustained for months, will do more for your A1c than an intense burst followed by weeks off.
Prioritize Sleep
Sleep is an underappreciated factor in blood sugar control. Sleeping six hours or less per night is associated with higher fasting glucose levels and an increased risk of developing prediabetes and diabetes, independent of body weight. The mechanism involves your body’s stress hormones: when you’re sleep-deprived, your cells become more resistant to insulin, and your body has a harder time regulating blood sugar overnight and into the next morning.
The encouraging flip side is that extending sleep beyond six hours produces measurable improvements. In studies where short sleepers successfully increased their sleep duration, researchers observed reduced fasting insulin resistance, improved insulin secretion, and better function of the cells in the pancreas that produce insulin. If you’re doing everything right with diet and exercise but still sleeping poorly, this could be the missing piece.
Use a Glucose Monitor for Real-Time Feedback
One of the most effective tools for lowering A1c is simply seeing what your blood sugar does in response to specific foods and activities. Continuous glucose monitors, small sensors worn on the arm or abdomen that track blood sugar throughout the day, provide this feedback in real time.
A real-world study of over 15,000 adults with type 2 diabetes found that those who used a continuous glucose monitor reduced their A1c by an average of 0.83 percentage points, compared to 0.32 points for those using standard testing. That’s a difference of about half a percentage point attributable to the monitor itself. The likely explanation is behavioral: when you can see your blood sugar spike after a particular meal or drop after a walk, you naturally adjust your choices.
Even if a continuous monitor isn’t accessible, periodic finger-stick testing before and two hours after meals can reveal which foods and portions your body handles well and which ones cause trouble.
When Lifestyle Changes Aren’t Enough
For many people, particularly those with A1c levels well above 7%, lifestyle changes alone may not close the gap entirely. That’s where medication comes in. A newer class of injectable medications called GLP-1 receptor agonists has shown particularly strong results. These drugs work by mimicking a gut hormone that stimulates insulin release, slows digestion, and reduces appetite. A meta-analysis of 14 clinical trials found that long-acting versions of these medications reduced A1c by an average of 1.0 percentage point, while also promoting significant weight loss. Newer dual-acting medications have shown even greater A1c reductions in head-to-head comparisons.
These medications aren’t a replacement for diet and exercise. They work best in combination with the lifestyle strategies above, and many people find that the appetite reduction these drugs provide makes it easier to stick with dietary changes they’d previously struggled with.
Putting It All Together
No single intervention is a magic fix. The people who see the biggest drops in A1c typically stack several strategies: eating more fiber and fewer refined carbs, exercising three or more times per week with a mix of cardio and strength training, sleeping seven or more hours, and losing a modest amount of weight if needed. Each of these contributes a fraction of a percentage point, and the effects compound.
Give yourself at least two to three months before your next A1c test to see the full impact of your changes. Red blood cells live about 90 to 100 days, so your A1c result is always a trailing indicator. Changes you made in the last few weeks before a blood draw will barely register, while habits sustained over the full three months will be reflected clearly. Patience and consistency matter more than perfection on any given day.