How to Lower Your A1C: An Evidence-Based Guide

You got your A1C result back, the number is higher than you hoped, and now you're wondering what you can actually do about it. The good news: an A1C isn't a fixed verdict. It's a moving average, and the daily choices you make in the coming weeks and months can move it in the right direction.

This is a general guide to how A1C works and the changes most consistently shown to lower it. It isn't personal medical advice, and your own target and plan should come from your own clinician, who knows your full history.

What is A1C, and what number are you aiming for?

Your A1C test measures the percentage of hemoglobin in your blood that has sugar attached to it, which reflects your average blood sugar over the past 2 to 3 months. Because it's an average, a single high day won't ruin it, and a single good day won't fix it. The goal is a steady, lower trend.

Here's how the standard ranges break down, according to the CDC:

• Normal: below 5.7%
• Prediabetes: 5.7% to 6.4%
• Diabetes: 6.5% or higher

What A1C goal should I aim for?

For most nonpregnant adults with diabetes, the standard target is an A1C below 7%, according to the American Diabetes Association and Mayo Clinic. An A1C of 7% or less generally means treatment is working and your blood sugar is consistently in a healthy range.

That target isn't one-size-fits-all, though. The ADA individualizes goals based on factors like your age, how long you've had diabetes, other health conditions, and your risk of low blood sugar. For some older adults or people with limited life expectancy, a less stringent goal such as below 8% may be more appropriate. This is exactly the kind of detail to settle with your own doctor rather than guessing.

How to lower your A1C with food

Because A1C tracks average blood sugar, what you eat day to day has a direct effect. You don't need a perfect or extreme diet. The CDC's core strategies are practical and sustainable:

Fiber matters especially. Fiber-rich carbohydrates slow how quickly blood sugar rises after a meal, which helps keep your averages lower over time, according to Mayo Clinic. Swapping refined carbs for whole, high-fiber options is one of the simplest changes with real payoff.

• Choose foods lower in calories, saturated fat, added sugar, and salt.
• Drink water instead of juice or soda.
• Use the plate method to control portion sizes.
• Count or pay attention to your carbohydrates.
• Favor fiber-rich carbs like whole grains, fruits, vegetables, and beans.

How to lower your A1C with exercise

Movement is one of the most powerful tools you have, and the evidence is strong. In a JAMA meta-analysis of 47 randomized trials covering 8,538 patients, structured exercise training lowered HbA1c by about 0.67% on average. Mayo Clinic notes that exercise can be as effective as medication at lowering blood sugar.

The dose matters. In that same analysis, doing more than 150 minutes of exercise per week produced a 0.89% reduction in A1C, versus 0.36% for 150 minutes or less. The CDC recommends about 30 minutes of physical activity most days, plus muscle-strengthening activity twice a week. Both aerobic exercise (like brisk walking) and resistance training help, and combining them works well.

Does losing weight lower A1C?

For many people, yes, especially when prediabetes or type 2 diabetes is tied to excess weight. According to the CDC, losing just 5% of your body weight if you're overweight with prediabetes can help reverse prediabetes.

You don't have to reach an ideal weight to benefit. Modest, steady weight loss, combined with the food and movement changes above, tends to move A1C in the right direction. The same habits that lower blood sugar, more fiber, fewer sugary drinks, and regular activity, also support gradual weight loss, so they reinforce each other.

When to see a doctor

Lifestyle changes are powerful, but they aren't always enough on their own, and that's not a personal failure. See a clinician to set your target, track your progress, and decide whether medication should be part of your plan. You should reach out promptly if your A1C is rising, if you have symptoms like excessive thirst, frequent urination, blurred vision, or unexplained weight loss, or if you've been told you have diabetes but don't have a clear treatment plan.

Very high blood sugar can become a medical emergency. Seek urgent care for symptoms such as confusion, fruity-smelling breath, nausea and vomiting, difficulty breathing, or trouble staying awake. When in doubt, get checked. A clinician can help you build a personalized plan and a realistic A1C goal, and tools like Nolla can make that ongoing support easier to reach.