Raising your A1c is a legitimate medical goal when levels drop low enough to cause frequent hypoglycemia or when tight blood sugar control creates more risk than benefit. For older adults, people on insulin, and those with conditions that cause falsely low readings, a higher A1c target (often 7.5% to 8.5%) can reduce dangerous episodes of low blood sugar without meaningful downsides. The approach depends on why your A1c is low in the first place.
Why a Higher A1c Might Be the Goal
Most diabetes guidance focuses on lowering A1c, so wanting to raise it can feel counterintuitive. But large clinical trials have shown that pushing A1c below 7% in people with longstanding type 2 diabetes increases the risk of severe hypoglycemia compared to a more relaxed target around 7.5% to 8.0%. In one major trial (ACCORD), the intensive-control group actually had a higher rate of premature death. For many people, especially those managing multiple health conditions, the sweet spot is higher than you might expect.
Aging compounds the problem. Older adults are more susceptible to the effects of low blood sugar: confusion, falls, fractures, emergency department visits, and hospitalization. Canadian clinical guidelines suggest specific A1c targets based on overall health. Healthy older adults with long life expectancy can aim for 7.0% to 7.5%. Those with moderate health issues and a life expectancy under 10 years do well at 7.5% to 8.0%. People with multiple serious conditions or significant functional limitations are safest at 8.0% to 8.5%.
To put those numbers in perspective, each A1c percentage point corresponds to a specific average blood sugar. An A1c of 7% reflects an average blood glucose of about 154 mg/dL, while 8% corresponds to roughly 183 mg/dL. Raising your A1c from 6.5% to 7.5% means allowing your average daily blood sugar to sit about 25 to 30 mg/dL higher than before.
Signs Your A1c May Be Too Low
A low A1c driven by frequent hypoglycemia comes with unmistakable warning signs: shakiness, sweating, a fast heartbeat, difficulty concentrating, dizziness, and intense hunger. As blood sugar drops further, you may experience confusion, slurred speech, blurry vision, and loss of coordination. Severe episodes can cause seizures, loss of consciousness, and in rare cases, death.
What makes this especially dangerous over time is a phenomenon called hypoglycemia unawareness. Repeated low blood sugar episodes gradually dull the body’s alarm system. Your brain and body stop producing the early warning signs like shakiness and palpitations, so you lose the ability to catch a low before it becomes severe. Older adults with hypoglycemia unawareness face a greater risk of dementia, falls, injuries, and motor vehicle accidents.
Conditions That Cause Falsely Low Readings
Sometimes the problem isn’t that your blood sugar is actually too low. Instead, your A1c test is giving an inaccurate reading. A1c measures the percentage of hemoglobin in your red blood cells that has been coated with sugar over the past two to three months. Anything that shortens the lifespan of those red blood cells gives them less time to accumulate sugar, pulling the A1c number down even if your daily blood sugar is normal or high.
Conditions that cause falsely low A1c include:
- Blood loss: Acute or chronic bleeding, including heavy menstrual periods, replaces older red blood cells with newer ones that haven’t been exposed to glucose as long.
- Hemolytic anemia: Red blood cells are destroyed faster than normal, shortening the window for sugar to attach.
- Sickle cell disease and thalassemia: These blood disorders alter hemoglobin structure and red cell turnover, making standard A1c tests unreliable.
- Pregnancy: Red blood cell lifespan drops from about 120 days to about 90 days, and A1c values decline through the second trimester. A1c should not be used to diagnose gestational diabetes for this reason.
- Splenomegaly: An enlarged spleen filters out red blood cells faster.
- Liver or kidney disease: Both can alter red cell turnover and hemoglobin chemistry.
- High-dose vitamin E: Doses of 600 to 1,200 mg per day can reduce the rate at which sugar attaches to hemoglobin, lowering A1c independently of actual blood glucose.
If any of these apply to you, your A1c may underestimate your true blood sugar levels. In these situations, raising A1c isn’t the real goal. Instead, you need an alternative way to monitor glucose, such as a continuous glucose monitor or fructosamine test, to get an accurate picture.
Adjusting Medication to Raise A1c
For people on diabetes medication whose A1c is running too low, the most direct path is reducing or changing medication. This is particularly relevant if you’re taking insulin or drugs that stimulate insulin release, since these carry the highest risk of pushing blood sugar too far down. The adjustment typically involves lowering doses incrementally rather than stopping anything abruptly.
This is a conversation to have with whoever manages your diabetes care. Bring a log of any low blood sugar episodes, including when they happen (overnight lows are common and easy to miss), how low the readings go, and how often they occur. If you use a continuous glucose monitor, the time-below-range data gives a clearer picture than A1c alone.
Dietary Changes That Raise Average Blood Sugar
If your A1c is low because you’re restricting carbohydrates heavily or eating very little, dietary adjustments can bring your average glucose up gradually. The goal isn’t to eat poorly. It’s to find a sustainable intake that keeps blood sugar in a safe, stable range rather than dipping dangerously low.
Adding more carbohydrates at meals is the most straightforward lever. Refined grains like white rice and white bread raise blood sugar more quickly and consistently than whole grains, though whole grains still contribute. Increasing portion sizes at meals, adding starchy sides, or including a bedtime snack with carbohydrates and protein can help prevent overnight lows specifically. If you’ve been skipping meals, eating on a more regular schedule keeps glucose from dropping during long fasting windows.
Red meat and processed meat products, which tend to be high in saturated fat, are associated with higher blood glucose over time, though the mechanism is more about insulin resistance than acute spikes. A dietary pattern heavy in refined grains, red meat, and processed foods was linked to a 56% higher likelihood of elevated blood sugar in one large population study. That said, the goal here isn’t to adopt an unhealthy diet. It’s to find the right caloric and carbohydrate balance that prevents your blood sugar from running too low.
The Role of Physical Activity
Exercise is a powerful blood sugar reducer, and if your A1c is already too low, intense or prolonged physical activity may be part of the problem. Each additional 30 minutes per day of moderate-to-vigorous exercise is associated with roughly a 0.11% decrease in A1c. That effect is independent of body weight changes.
This doesn’t mean you should stop exercising. But if you’re doing long endurance sessions or high-intensity training while on insulin or blood sugar-lowering medication, the combination can drive glucose dangerously low during and after workouts. Eating carbohydrates before or during exercise, reducing medication doses on active days, or shifting workout timing can all help. Interestingly, sedentary time alone doesn’t independently raise A1c once you account for exercise. It’s the exercise itself that has the dominant effect.
How Long Changes Take to Show Up
A1c reflects your average blood sugar over roughly 90 to 120 days, which is the lifespan of a red blood cell. After making changes to diet, medication, or activity level, you won’t see the full effect on your next A1c until all the red blood cells circulating at the time of the change have been replaced with new ones. This takes about three months.
Retesting before 90 days gives you a blended number that still includes the old pattern. The American Academy of Family Physicians recommends waiting at least three months between A1c tests for this reason. In practice, your care team will likely recheck at the three-month mark, assess whether the new target is being met, and make further adjustments from there.