Type 2 Diabetes: How Quickly Can You Lower Your A1C?
DiabetesType 2 Diabetes

How Quickly Can You Lower Your A1C if You Have Type 2 Diabetes?

How Quickly Can You Lower Your A1C if You Have Type 2 Diabetes?
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Published on October 08, 2026
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It can take time to reduce your average blood glucose levels and, as a result, get a lower hemoglobin A1C test result when you have type 2 diabetes.

 An A1C test measures your average blood sugar level, generally reflecting the prior three months before your test.

“This three-month interval is based on the average lifespan of a red blood cell,” says Bethany Gottesman, MD, an endocrinologist at Phoenix Children’s Hospital in Arizona. The A1C test gives clues to how much glucose in the blood is “sticking” to hemoglobin molecules (proteins) in your red blood cells, says Dr. Gottesman.

So as your blood sugar improves and your body replaces red blood cells, your A1C drops.

 Here, find out how long it may take to lower your average blood glucose and, in turn, reduce your A1C level.

How Soon Can You Lower Your A1C?

Guidelines for measuring A1C suggest having this test every three to six months, so it’s hard to know how A1C levels behave before the three-month mark.

 Red blood cells don't get replaced all at once — some fraction are getting recycled all the time, says Gillian Goddard, MD, an endocrinologist and an adjunct assistant professor of medicine at the NYU Grossman School of Medicine in New York City.
Medications for type 2 diabetes can lower blood sugar quickly; some may even work within days.

 “But to see the full effect of a new [treatment], you need to wait the 90 days it will take for all the red blood cells to get recycled and replaced with new ones,” Dr. Goddard says.

“However, the good news is that A1C is influenced more heavily by recent blood sugar levels,” says the endocrinologist Betul Hatipoglu, MD, a professor at the School of Medicine at Case Western Reserve University and the director of Case Center for Diabetes, Obesity, and Metabolism in Cleveland. “With consistent changes in treatment and lifestyle, improvement can begin within a few weeks, although we typically wait about three months to see the full effect.”

Factors That Affect How Quickly You Can Lower Your A1C

Your average blood sugar is the main driving factor in how fast your A1C drops, says Gottesman. Less sugar in your bloodstream means less to attach to the red blood cells over time and add to the A1C measure, she says.

According to Dr. Hatipoglu, these factors also play a role in how fast your A1C can drop:

  • Your A1C level when treatment starts
  • Diabetes severity
  • How long you have had diabetes
  • How much insulin your body still makes
  • The treatment you’re on
  • How consistently blood sugar levels improve

“Someone with a higher starting A1C may see a larger initial reduction, particularly when effective medications are combined with changes in nutrition, physical activity, and weight management,” says Hatipoglu.

Lots of factors cause individual variation, including stress and hormones.

 And other health conditions, like anemia, blood disorders that affect hemoglobin, and chronic kidney disease can also push your A1C results lower or higher.

 “In these situations, glucose monitoring provides additional information,” says Hatipoglu.

Tips for Lowering Your A1C as Quickly as Possible

The best method to lower your A1C uses a combination of medication, exercise, and good nutrition.

Take Your Medications as Prescribed

Your provider may prescribe oral medications like metformin (Glucophage XR, Glumetza, Fortamet), insulin injections, GLP-1 receptor agonists (Ozempic, Trulicity), or SGLT-2 inhibitors (Jardiance, Brenzavvy) to help you manage your blood sugar.

 “The fastest way to lower A1C is with insulin,” says Goddard. “However, insulin has some drawbacks, including that it can cause low blood sugars and weight gain.”

The best approach combines medication with nutrition, physical activity, and consistent follow-up with your provider, says Hatipoglu.

Adjust Your Diet

The food you eat has a huge impact on your blood sugar levels.

 Focus on eating a healthy diabetic diet that is rich in whole grains as well as fiber and protein, and avoid processed sugars that tend to raise blood sugar quickly, says Gottesman.
Your provider or dietitian may give you a few tools to help you balance your diet. These may include:

Carbohydrate counting: Carbs are broken down into sugar in your blood, so keeping detailed track of how many you eat and drink can help you limit yourself and give the right dose of insulin.

Plate method: Using a nine-inch-diameter plate, fill half with low-starch vegetables, a quarter with lean protein, and a quarter with healthy carbohydrates. Here are some examples of each:

Low-starch or nonstarchy vegetables
Lean protein
Healthy carbs
Leafy greens
Fish, shellfish
Whole-grain bread, pasta, and rice
Zucchini, yellow squash
Beans, lentils, tofu
Fruits
Broccoli, cauliflower
Eggs
Low-fat yogurt
Tomatoes, eggplant
Low-fat meats
Starchy vegetables (sweet potatoes, green peas, or acorn squash)
Green beans, snow peas
Poultry
Beans
Learn what healthy portion sizes look like for your favorite foods, and follow those guidelines. Avoid soda, juice, and other high-sugar drinks.

 “Reducing sugary drinks and refined carbohydrates can improve blood sugar within days,” says Hatipoglu.
Alcohol can also make your blood sugar fluctuate, so it’s best to stick with a maximum of one drink a day for women, two for men.

Add Exercise to Your Day

Exercise increases your insulin sensitivity, which means the insulin in your body works better to use the sugar in your blood for energy.

 “The activity part is particularly important after meals to help the body more effectively utilize the glucose in the food,” says Gottesman.
Research suggests that even a 10-minute walk after lunch may prevent your blood sugar from spiking.

 And consistent exercise can lower your A1C.

Regular exercise can also help you lose weight, which can make it easier to manage blood sugar levels.

 Try for 30 minutes a day of moderate-intensity aerobic exercise like walking or cycling most days, plus muscle-strengthening exercises two to three times a week. Your provider can help you develop a safe and effective exercise plan.

Get Better Sleep

Your body may have a harder time managing blood sugar when you don’t get enough sleep.

 Set yourself up for sleep success by adopting these healthy sleep habits.

  • Avoid screens and intense activity an hour or so before bed.
  • Eat only light snacks (no heavy meals) near bedtime.
  • Follow a calming bedtime routine to prepare your mind for sleep.
  • Stop drinking caffeine and alcohol several hours before you want to go to bed.
  • Make your sleep space comfortable, cool, and dark.

How to Manage A1C Goals and Expectations

Hatipoglu encourages people not to focus exclusively on how quickly they can lower their A1C. “The goal is to improve blood sugar safely and maintain those improvements over time,” she says.

Goddard agrees, and says it’s often better to lower A1C over several months with your doctor’s adjustments to one or two medications that don't cause low blood sugars, like metformin or GLP-1s, which are medications that help you lose weight and increase the release of insulin to manage diabetes.

“I also want people to understand that progress doesn't have to wait for the next A1C test,” says Hatipoglu. She sees improvements in daily glucose levels, energy, and healthy habits as meaningful steps toward better metabolic health.

“The goal isn't simply to achieve a lower number,” says Hatipoglu. “It's to understand what works for your body and build changes you can sustain.”

Resources We Trust

EDITORIAL SOURCES
Everyday Health follows strict sourcing guidelines to ensure the accuracy of its content, outlined in our editorial policy. We use only trustworthy sources, including peer-reviewed studies, board-certified medical experts, patients with lived experience, and information from top institutions.
Resources
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  4. AACE Patient Journey of Diabetes Technology. American Association of Clinical Endocrinology.
  5. How To Tell if Your Type 2 Diabetes Treatment Is Working. Cleveland Clinic. February 16, 2026.
  6. Gough A et al. Within-Individual Variation of HbA1c Measurements in Primary Care: A Retrospective Cohort Study. PLoS One. October 3, 2025.
  7. Wu T et al. Glycemic Assessment When Hemoglobin A1C Is Unreliable: A Clinical-Laboratory Framework for Kidney Disease, Anemia, and Hemoglobinopathies. Frontiers in Endocrinology. September 1, 2026.
  8. How Type 2 Diabetes Progresses. American Diabetes Association.
  9. Diabetes Management: How Lifestyle, Daily Routine Affect Blood Sugar. Mayo Clinic. January 6, 2024.
  10. What Is the Diabetes Plate? American Diabetes Association. May 14, 2026.
  11. Blood Glucose and Exercise. American Diabetes Association.
  12. Hashimoto K et al. Positive Impact of a 10-Min Walk Immediately After Glucose Intake on Postprandial Glucose Levels. Scientific Reports. July 2, 2025.
  13. Healthy Sleep Habits. National Heart, Lung, and Blood Institute. March 24, 2022.
  14. Fisher J. How Does Ozempic Work? Understanding GLP-1s for Diabetes, Weight Loss, and Beyond. Harvard Health Publishing. April 14, 2025.
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Anna L. Goldman, MD, is a board-certified endocrinologist. She teaches first year medical students at Harvard Medical School and practices general endocrinology in Boston.

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