Lowering your A1C is achievable through a combination of dietary changes, regular exercise, better sleep, and in some cases medication. Most lifestyle changes take two to three months to show up on an A1C test, since the measurement reflects your average blood sugar over the lifespan of your red blood cells. The size of the drop depends on where you’re starting: people with higher A1C levels tend to see bigger improvements.
For context, an A1C between 5.7% and 6.4% falls in the prediabetes range, and 6.5% or higher indicates diabetes. Your personal target may differ depending on your age and health status, but for most adults, getting below 7% significantly reduces the risk of complications.
Cut Back on Carbohydrates
Reducing carbohydrate intake is one of the most effective dietary strategies for lowering A1C. Carbohydrates break down into glucose faster than protein or fat, so eating fewer of them means less sugar entering your bloodstream after meals. In clinical trials, people following a low-carb, high-fat diet saw their A1C drop by an average of 1.29 percentage points compared to those receiving standard care. That’s a substantial change, enough to move someone from poorly controlled diabetes into a much healthier range.
The effect is strongest early on. A meta-analysis of 36 studies found that low-carb diets reduced A1C by 1.38 percentage points in the first eight weeks, but the advantage narrowed to about 0.55 points by four to six months. This likely reflects the difficulty of sticking to strict carb limits long-term. The practical takeaway: you don’t need to go to extremes. Consistently choosing fewer refined carbs, more vegetables, and more protein-rich foods produces real results even if you aren’t following a strict protocol.
Eat More Fiber
Fiber, particularly the soluble kind found in oats, beans, lentils, and many fruits, slows the absorption of sugar into your bloodstream. This blunts the sharp blood sugar spikes that follow meals, which over time contributes to a lower A1C. The CDC recommends adults eat 22 to 34 grams of fiber daily depending on age and sex, but most Americans fall well short of that.
Getting closer to that target doesn’t require a dramatic overhaul. Adding a handful of beans to a salad, swapping white rice for a lentil-based side, or starting your morning with steel-cut oats are simple changes that add up. Focus on whole food sources rather than fiber supplements, since whole foods also deliver vitamins, minerals, and other compounds that support blood sugar regulation.
Exercise Regularly
Both aerobic exercise (walking, cycling, swimming) and resistance training (weight lifting, bodyweight exercises) lower A1C independently. A meta-analysis found that resistance training alone reduced A1C by about 0.4 percentage points compared to inactive controls, and there was no significant difference in effectiveness between resistance and aerobic training. Both work. Combining them may offer additional benefits for overall metabolic health, though the key factor is consistency rather than the specific type of exercise you choose.
Exercise lowers blood sugar in two ways. During activity, your muscles pull glucose from the blood for energy, dropping your levels in real time. Over weeks and months, regular exercise also makes your cells more responsive to insulin, so your body handles blood sugar more efficiently even when you’re resting. Aim for at least 150 minutes per week of moderate activity, which breaks down to about 30 minutes five days a week. If you’re starting from zero, even 10-minute walks after meals can meaningfully reduce post-meal blood sugar spikes.
Prioritize Sleep
Poor sleep raises blood sugar through a straightforward stress mechanism. When you’re sleep-deprived, your body produces more cortisol, a stress hormone that signals your liver to release stored glucose into your bloodstream. Over time, this creates a pattern of chronically elevated blood sugar and makes your cells less responsive to insulin. The combination of insulin resistance, weight gain, and higher blood sugar levels all push your A1C upward.
Most adults need seven to nine hours of sleep per night. If you’re consistently getting six or fewer, improving your sleep may lower your A1C without any other changes. Practical steps include keeping a consistent bedtime, limiting screen time in the hour before sleep, keeping your bedroom cool, and avoiding large meals or caffeine late in the day. Sleep disorders like sleep apnea are especially common in people with type 2 diabetes and worth discussing with a healthcare provider if you snore heavily or wake feeling unrefreshed.
Lose Weight if You Carry Extra
Weight loss improves insulin sensitivity and helps your body regulate blood sugar more effectively. Interestingly, the relationship between weight loss and A1C reduction isn’t perfectly linear. In one clinical study, some people saw large A1C drops with modest weight loss while others lost significant weight without as much change in blood sugar. This means weight loss helps, but it’s not the only variable, and you shouldn’t be discouraged if the scale moves faster than your A1C does.
Even moderate weight loss of 5% to 7% of your body weight (roughly 10 to 15 pounds for someone weighing 200 pounds) is enough to meaningfully improve blood sugar control. The most sustainable approach combines the dietary and exercise changes described above rather than relying on aggressive calorie restriction, which tends to be hard to maintain.
Use a Continuous Glucose Monitor
Continuous glucose monitors (CGMs) are small sensors you wear on your arm or abdomen that track blood sugar in real time. The feedback loop they create is powerful. You can see exactly how specific foods, activities, and sleep patterns affect your blood sugar, which makes it much easier to make targeted adjustments. Real-world data from patients with type 2 diabetes showed an average A1C reduction of 0.9 percentage points after just three months of CGM use.
CGMs used to be reserved for people on insulin, but access has expanded significantly. Many insurance plans now cover them for anyone with diabetes, and some companies offer them without a prescription for general wellness tracking. If you’ve been managing your blood sugar based only on occasional finger sticks or quarterly lab tests, a CGM can reveal patterns you’d otherwise miss, like overnight blood sugar spikes or unexpected reactions to foods you assumed were safe.
Medications That Make a Big Difference
When lifestyle changes alone aren’t enough, medications can produce significant A1C reductions. Newer drugs in the GLP-1 receptor agonist class have proven especially effective. In a large systematic review, the most potent option in this class reduced A1C by an average of 2.1 percentage points, a dramatic improvement. These medications work by helping your body release insulin more effectively after meals, slowing digestion so glucose enters the bloodstream more gradually, and reducing appetite.
Your doctor may also recommend older, well-established options depending on your situation. The right medication depends on your starting A1C, other health conditions, side effect tolerance, and cost. What matters most is that medication and lifestyle changes aren’t an either-or decision. They work best together.
Your A1C Target May Be Personal
For most adults with diabetes, an A1C below 7% is the standard goal. But this number isn’t one-size-fits-all. Older adults with significant health conditions may have a target of 8% or even 8.5%, because pushing blood sugar too low increases the risk of hypoglycemia, which in older people can cause falls, confusion, cardiovascular events, and even long-term cognitive decline. Repeated episodes of severe low blood sugar have been linked to a higher risk of developing dementia.
The right target balances the long-term benefits of tighter blood sugar control against the immediate risks of going too low. If you’re younger and otherwise healthy, aiming for below 7% makes sense. If you’re older or managing multiple chronic conditions, a somewhat higher target may actually be safer. This is a conversation worth having with your healthcare provider so you’re working toward a number that fits your specific situation rather than chasing an arbitrary benchmark.
How Long It Takes to See Results
Because A1C reflects your average blood sugar over the past two to three months, you won’t see changes overnight. If you start making meaningful dietary and exercise changes today, your next A1C test in three months should reflect those improvements. The biggest drops tend to happen in the first few months, especially if your starting A1C is high. Over time, the rate of improvement often slows as you get closer to your target, which is normal and expected.
Testing more frequently than every three months generally isn’t useful since the measurement needs a full red blood cell cycle to accurately capture your new average. If you want faster feedback on whether your changes are working, a CGM or regular finger-stick glucose testing can show you daily trends while you wait for your next lab draw.