How to Lower Your A1C: Proven Strategies
Your A1C reflects your average blood glucose over roughly the past three months. If your A1C is above your goal, you may be wondering what you can do to bring it down. The encouraging news is that many strategies work, and even small improvements can lower the risk of diabetes complications. This guide explains how A1C works, realistic goals, and proven steps to lower it, including eating, activity, medicines, monitoring, sleep, and stress. Work with your health care team to choose the steps that fit you, and never change medicines on your own.
Understanding your A1C
According to NIDDK, the A1C test measures the percentage of hemoglobin, a protein in red blood cells, that has glucose attached. Because red blood cells live about three months, A1C reflects average glucose over that period. Higher average glucose means a higher A1C.
For many nonpregnant adults with diabetes, the American Diabetes Association's Standards of Care suggest an A1C goal below 7%, but goals are individualized. Some people may aim lower if it is safe; others, such as older adults or people with frequent low blood glucose, may have a higher goal. See A1C and blood sugar targets.
How fast can A1C change?
Because A1C reflects about three months of glucose, changes take time to show up fully. Recent weeks influence A1C more than earlier weeks, so you may see some change within a month or two, but providers usually recheck A1C about three months after a treatment change. Daily glucose checks or a continuous glucose monitor show the effect of changes much sooner.
Why lowering A1C matters
Keeping A1C closer to your goal lowers the risk of complications affecting the eyes, kidneys, and nerves. Large, long-term studies in type 1 and type 2 diabetes have shown that improving glucose control reduces these complications. See our guides on eye health, kidney health, and neuropathy.
1. Know your numbers and patterns
You can't change what you can't see. Checking your glucose, or using a CGM, shows when your glucose is high, such as after certain meals, overnight, or in the morning. Look for patterns rather than single readings. Bring your data to appointments. See checking blood sugar and CGMs.
If your morning glucose is often high, read about the dawn phenomenon.
2. Rethink your plate
Food has a major effect on glucose. Helpful strategies include:
- Use the plate method: half nonstarchy vegetables, a quarter protein, a quarter carbohydrate foods. See diabetes-friendly eating basics.
- Be consistent with carbohydrates. Learn how many carbs are in your usual foods and spread them through the day. See carb counting.
- Choose high-fiber, minimally processed carbs such as vegetables, beans, whole grains, and whole fruit. See the glycemic index explained.
- Cut back on sugary drinks. Replacing regular soda, sweet tea, and juice with water or unsweetened drinks is one of the simplest changes with a meaningful effect.
- Watch portions, especially of starchy foods and restaurant meals.
- Pair carbs with protein, fat, or fiber to slow the glucose rise, as the CDC describes.
- Plan snacks rather than grazing. See best snacks for diabetes.
A registered dietitian can help you create a plan. Medical nutrition therapy has been shown to lower A1C in people with diabetes.
3. Move more
Physical activity helps muscles use glucose and improves insulin sensitivity. Federal guidelines recommend at least 150 minutes per week of moderate activity, such as brisk walking, plus muscle-strengthening activities on two or more days. Even short walks after meals can help lower the glucose rise after eating. Reducing long periods of sitting helps too. See exercise and diabetes.
4. Manage weight if needed
For people with type 2 diabetes and overweight, losing weight can lower A1C, and larger weight loss tends to have larger effects. Even modest weight loss can help. See weight and diabetes.
5. Take medicines as prescribed
Missed doses are a common reason for higher A1C. Tips:
- Use pill organizers, phone reminders, or link doses to daily routines.
- Refill prescriptions before you run out.
- Tell your provider about side effects or cost problems instead of stopping a medicine; alternatives may be available.
- Ask whether your medicines are still the best fit. Type 2 diabetes often changes over time, and adding or changing medicines, including newer options or insulin, may be needed to reach your goal. Needing more medicine is not a failure.
See metformin and common diabetes medications and insulin basics.
6. Fine-tune insulin with your care team
If you take insulin, getting doses right makes a big difference. Your team may adjust basal doses, insulin-to-carbohydrate ratios, or correction factors based on your data. Insulin pumps and automated insulin delivery systems can help many people with type 1 diabetes improve their glucose. Learning to time mealtime insulin before eating, as directed, can reduce after-meal spikes.
7. Sleep well
Short or poor sleep can raise insulin resistance and glucose. Aim for at least 7 hours, and get evaluated for sleep apnea if you snore loudly or are sleepy during the day. See sleep and diabetes.
8. Manage stress
Stress hormones raise glucose and can disrupt routines. Activity, relaxation, social support, and professional help can make a difference. See stress and blood sugar.
9. Limit alcohol and don't smoke
Alcohol can cause unpredictable glucose and adds calories. Smoking increases insulin resistance and the risk of complications. See alcohol and diabetes.
10. Get education and support
Diabetes self-management education and support (DSMES) programs teach skills for eating, activity, monitoring, and medicines, and have been shown to help people lower A1C. Ask your provider for a referral. NIDDK's steps to manage your diabetes is another helpful resource.
Lower A1C safely
Lowering A1C quickly is not always better. If you take insulin or sulfonylureas, tighter glucose control can raise the risk of low blood glucose. Check your glucose more often when making changes, know how to treat lows, and tell your care team about any lows. See hypoglycemia. In people with long-standing high glucose and diabetic eye disease, rapid improvement can sometimes temporarily worsen retinopathy, so keep up with eye exams.
When A1C may not tell the whole story
Some conditions, such as anemia, certain hemoglobin variants, kidney disease, recent blood loss or transfusion, and pregnancy, can affect A1C accuracy. If your A1C doesn't match your glucose readings, your provider may use other measures, such as CGM data or the glucose management indicator.
Beware of quick fixes
Be cautious about supplements or products that promise to "cure" diabetes or lower A1C quickly. Many have little evidence, and some can interact with medicines. The NIH's National Center for Complementary and Integrative Health has information on diabetes and dietary supplements. Talk with your provider before trying any supplement.
Frequently asked questions
Can I lower my A1C without medicine?
Some people, especially those with prediabetes or recently diagnosed type 2 diabetes, can lower A1C significantly with eating changes, activity, and weight loss. Many others need medicine as well. People with type 1 diabetes always need insulin.
Key takeaways
- A1C reflects average glucose over about three months; many adults aim for below 7%, but goals are personal.
- Food choices, regular activity, weight management, sleep, and stress management all help lower A1C.
- Taking medicines consistently and working with your team to adjust treatment are key.
- Track patterns with a meter or CGM, and lower A1C safely to avoid lows.
Sources
Links to the sources cited above appear in the text. We rely on the Centers for Disease Control and Prevention (CDC), the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), and the American Diabetes Association (ADA).
Related guides: Blood sugar and treatment
- A1C and Blood Sugar Targets: Understanding Your Numbers
- Checking Blood Sugar: Meters and Continuous Glucose Monitors
- Hypoglycemia (Low Blood Sugar): Signs, Treatment, and Prevention
- High Blood Sugar and Diabetic Ketoacidosis (DKA)
- Insulin Basics: Types, Delivery, and Safety
- Metformin and Common Diabetes Medications
- Managing Diabetes When You're Sick
- The Dawn Phenomenon: Why Morning Blood Sugar Is High