Hemoglobin A1c 5.7 %: Is That High?

Written by

Ernestas K.

Clinical research writer specializing in human health, biology, and preventive medicine.

Reviewed against ADA, CDC, NIH, WHO, Mayo Clinic guidelines · Last reviewed March 17, 2026

Is Hemoglobin A1c 5.7 % Low, Normal, or High?

HbA1c 5.7% falls in the prediabetes range and is higher than normal. The American Diabetes Association classifies HbA1c between 5.7 and 6.4 percent as prediabetes. At 5.7%, your average blood sugar over the past two to three months has been elevated, but you have not crossed the threshold into diabetes. This is an important window of opportunity because prediabetes is often reversible with the right lifestyle changes.

Hidden Risk of Hemoglobin A1c 5.7 %

An HbA1c of 5.7% rarely causes symptoms, which is exactly what makes prediabetes so easy to overlook. Most people feel perfectly fine at this level, but elevated blood sugar is already doing subtle damage behind the scenes. The CDC estimates that more than 80 percent of people with prediabetes do not know they have it.

• Prediabetes accelerates damage to blood vessels even before reaching the diabetes threshold. The harmful process starts earlier than most people realize
• People with prediabetes have up to 50 percent higher risk of cardiovascular disease compared to those with normal blood sugar, according to the American Heart Association
• Without intervention, 15 to 30 percent of people with prediabetes will develop type 2 diabetes within five years
• Prediabetes often travels with high blood pressure, elevated triglycerides, and excess belly fat, a cluster called metabolic syndrome that multiplies health risks
• The Diabetes Prevention Program study showed that lifestyle changes reduced progression to diabetes by 58 percent. The earlier you act, the better your odds

What Does a Hemoglobin A1c Level of 5.7 % Mean?

HbA1c measures the percentage of hemoglobin in your red blood cells that has glucose attached to it. Hemoglobin is a protein that carries oxygen throughout your body, and glucose naturally sticks to it over time. Since red blood cells live about three months, HbA1c gives you a rolling average of your blood sugar over that period.

At 5.7%, your estimated average blood sugar has been approximately 126 mg/dL. This is higher than the healthy average of around 100 mg/dL and indicates that your body is struggling to manage glucose as efficiently as it should.

The underlying issue in most cases of prediabetes is insulin resistance. Your cells are becoming less responsive to insulin, the hormone that moves glucose from the blood into cells. When cells resist insulin's signal, glucose stays in the bloodstream longer and accumulates to higher levels after meals. Your pancreas tries to compensate by producing more insulin, but over time it may not keep up.

Insulin resistance develops gradually, often over years, and is closely linked to excess body weight (especially around the abdomen), physical inactivity, and dietary patterns high in refined carbohydrates and sugar. Genetics play a role too, but lifestyle is usually the biggest driver and the most actionable lever you can pull.

Lifestyle Changes for Hemoglobin A1c 5.7 %

Physical activity is the single most effective tool for lowering HbA1c from the prediabetes range. The Diabetes Prevention Program, a landmark NIH study, demonstrated that 150 minutes of moderate exercise per week combined with modest weight loss reduced the risk of developing diabetes by 58 percent, outperforming metformin medication.

You do not need to become an athlete. Walking briskly for 30 minutes five days a week meets the 150-minute target. Start where you are. If 30 minutes feels like too much, begin with 10-minute walks after meals and gradually increase. Post-meal walking is particularly effective because it directly lowers the blood sugar spike that follows eating.

Weight loss has a powerful effect on insulin sensitivity. Losing just 5 to 7 percent of your body weight, about 10 to 14 pounds for a 200-pound person, can significantly improve how your cells respond to insulin. You do not need to reach an ideal weight. Even modest, sustainable loss makes a measurable difference.

Strength training is especially valuable. Muscle tissue actively absorbs glucose from the bloodstream, and building muscle increases your body's capacity to manage blood sugar. Two to three sessions per week of resistance exercise, even bodyweight movements like squats and lunges, complement aerobic activity well.

Sleep and stress management are not extras. Sleeping fewer than six hours per night impairs insulin sensitivity, and chronic stress keeps cortisol elevated, which pushes blood sugar higher. Prioritize seven to nine hours of quality sleep and find a stress reduction practice that works for your life.

Diet Changes for Hemoglobin A1c 5.7 %

Diet is one of the most direct ways to lower HbA1c from 5.7% back toward normal. The American Diabetes Association emphasizes that you do not need a special diet. What works is a sustainable eating pattern that reduces the load on your insulin system. Small, consistent changes outperform dramatic restrictions every time.

• Reduce refined carbohydrates: white bread, white rice, pastries, crackers, and sugary cereals all convert to glucose rapidly. Swap for whole grain versions that release glucose more gradually
• Eliminate or sharply cut sugary drinks. Soda, fruit juice, sweet tea, and flavored coffee are among the largest contributors to blood sugar problems. Replace with water, unsweetened tea, or black coffee
• Increase fiber to 25 to 30 grams daily. Vegetables, beans, lentils, oats, berries, and flaxseed slow glucose absorption and improve insulin sensitivity
• Add protein to every meal: chicken, fish, eggs, Greek yogurt, tofu, legumes. Protein slows carbohydrate digestion and helps prevent blood sugar spikes
• Use healthy fats from olive oil, avocado, nuts, and fatty fish. They improve satiety and stabilize blood sugar between meals
• Control portion sizes, especially for starchy foods. A serving of rice or pasta is about the size of your fist
• Eat consistently rather than skipping meals. Going long periods without food followed by large meals creates glucose roller coasters that strain your insulin system

Hemoglobin A1c 5.7 % in Men, Women, Elderly, and Kids

Prediabetes at HbA1c 5.7% has different dimensions depending on age and sex. In men, prediabetes typically develops in the 30s to 50s, closely linked to weight gain, reduced physical activity, and sedentary work habits. Men are more likely to have prediabetes without knowing it, partly because they visit doctors less frequently for routine screening.

For women, the risk of prediabetes increases significantly after menopause. The decline in estrogen is associated with increased insulin resistance and a shift in fat distribution toward the midsection. Women who had gestational diabetes are at particularly high risk. The CDC reports that up to 50 percent of women with a history of gestational diabetes will develop type 2 diabetes within 10 years without preventive steps.

In older adults, HbA1c naturally tends to rise with age as insulin sensitivity decreases. A reading of 5.7% in a 70-year-old may be managed differently than the same number in a 40-year-old. However, the American Geriatrics Society still recommends lifestyle interventions for older adults with prediabetes because the benefits extend beyond blood sugar to include better heart health, cognitive function, and mobility.

Prediabetes in children and teenagers has risen sharply in recent decades, closely tied to the increase in childhood obesity. The American Academy of Pediatrics recommends screening overweight children with additional risk factors starting at age 10. In young people, prediabetes is highly responsive to dietary changes and increased physical activity.

Medicine Effects on Hemoglobin A1c 5.7 %

At HbA1c 5.7%, lifestyle changes are the first-line approach, and most doctors will not prescribe medication immediately. The Diabetes Prevention Program showed that diet and exercise were more effective than metformin for most people. However, medication may enter the conversation if lifestyle changes alone do not bring your numbers down after several months.

• Metformin is the only medication commonly recommended for prediabetes. It reduces liver glucose production and improves insulin sensitivity. The ADA considers it for people under 60 with BMI over 35 or women with prior gestational diabetes
• Some medications you take for other conditions can raise blood sugar. Corticosteroids like prednisone are common culprits
• Thiazide diuretics and certain beta-blockers used for blood pressure can modestly elevate glucose levels
• Statins may carry a small increased risk of progressing to diabetes, though cardiovascular benefits typically outweigh this concern
• Some antipsychotic medications affect insulin sensitivity and can raise blood sugar
• If you start any new medication, ask whether it could affect your HbA1c. This awareness helps you and your doctor monitor and adjust accordingly

When to Retest Hemoglobin A1c 5.7 %

With an HbA1c of 5.7%, your doctor will likely recommend retesting in three to six months. This gives you time to implement lifestyle changes and see whether they are making a difference. Since HbA1c reflects a two to three month average, retesting sooner than three months may not capture meaningful change.

Your doctor may also check your fasting glucose alongside HbA1c to get a more complete picture. The two tests complement each other: HbA1c shows the trend while fasting glucose shows a point in time.

For the most accurate results, there is no special preparation needed for an HbA1c test. Unlike fasting glucose, you do not need to fast beforehand. The test can be done at any time of day regardless of when you last ate.

Once you establish a pattern and a plan, regular monitoring every three to six months is standard for prediabetes. If your HbA1c is moving in the right direction, it confirms your efforts are working. If it plateaus or rises, it signals that your approach may need adjustment. Tracking your HbA1c over time is one of the most motivating tools available because the progress is concrete and measurable.

Hemoglobin A1c 5.7 % — Frequently Asked Questions

When to See a Doctor About Hemoglobin A1c 5.7 %

An HbA1c of 5.7% warrants a conversation with your doctor, though it is not an emergency. Schedule an appointment within the next few weeks to discuss your result and build a plan. Your doctor may want to check your fasting glucose, lipid panel, and blood pressure as well, since prediabetes often comes alongside other metabolic risk factors.

Be honest about your lifestyle at this appointment. Your doctor can help set realistic, personalized goals for diet, exercise, and weight that fit your actual life. If you have struggled with lifestyle changes before, say so. Diabetes prevention programs, registered dietitians, and community support groups are all evidence-based resources that can help.

If you have a family history of type 2 diabetes, make sure your doctor knows. This information influences how closely your blood sugar should be monitored and whether preventive medication might be worth considering.

Do not wait for this to become diabetes before taking it seriously. Prediabetes is your body sending an early signal, and it is one of the clearest signals that comes with a proven path to reverse it. The changes you make now will pay dividends for years.