Blood sugar levels tell you how much glucose is in your blood. For most adults without diabetes, a healthy fasting blood sugar is between 70 and 100 mg/dL. After eating, your blood sugar should stay below 140 mg/dL when checked two hours later. For people with diabetes, target ranges are often slightly higher but aim to keep blood sugar as close to normal as safely possible.
What Is a Normal Fasting Blood Sugar Level?
A normal fasting blood sugar is taken after you have not eaten for at least eight hours. The American Diabetes Association and other major health organizations define the normal range as 70 to 99 mg/dL. A result of 100 to 125 mg/dL is considered prediabetes, also called impaired fasting glucose. Two separate tests showing 126 mg/dL or higher point to diabetes.
Fasting levels below 70 mg/dL are considered low blood sugar, or hypoglycemia. For most people, this is not dangerous unless it causes symptoms and stays low. But anyone taking glucose-lowering medication should treat a reading below 70 promptly.
What Is a Normal Blood Sugar Level After Eating?
After a meal, blood sugar rises and then gradually falls. In people without diabetes, it should stay below 140 mg/dL when checked two hours after the start of the meal. This is called the postprandial blood sugar. Levels that consistently go above 200 mg/dL two hours after eating may indicate diabetes.
If you have diabetes, a common target is less than 180 mg/dL one to two hours after eating. Individual targets may vary based on age, duration of diabetes, and other health factors. Your doctor can help set a personal post-meal goal.
What Is a Healthy A1c Range?
The A1c test measures your average blood sugar over the past two to three months. A normal A1c is below 5.7 percent. A reading between 5.7 and 6.4 percent indicates prediabetes. An A1c of 6.5 percent or higher on two separate tests is diagnostic for diabetes.
For people with diabetes, the general target is an A1c below 7 percent. However, some people aim for lower or higher targets depending on their health. Younger people with newly diagnosed diabetes might aim for below 6.5 percent. Older adults or those with other medical conditions may have a target of less than 8 percent to avoid dangerously low blood sugar.
What Blood Sugar Targets Are Recommended for People With Diabetes?
The American Diabetes Association suggests these general targets for most nonpregnant adults with diabetes:
- Fasting or pre-meal blood sugar: 80 to 130 mg/dL
- Post-meal blood sugar (one to two hours after): less than 180 mg/dL
- A1c: less than 7 percent
These are guidelines, not strict rules. Your doctor may adjust them based on your personal health, how often you have low blood sugar, and your risk of complications. Tight control lowers the risk of long-term damage to eyes, kidneys, and nerves, but it also raises the risk of hypoglycemia. Some people benefit from looser targets if they experience frequent lows or have other serious health conditions.
How Do Age and Other Health Factors Affect Blood Sugar Targets?
Age and overall health change what counts as a “good” target. For older adults, especially those over 65 with multiple health issues or a history of severe low blood sugar, doctors may set higher targets. Fasting levels of 90 to 150 mg/dL and an A1c of 7.5 to 8.5 percent may be acceptable. The goal is to prevent falls, confusion, and hospital visits from low blood sugar.
Pregnancy changes blood sugar targets dramatically. In gestational diabetes, fasting blood sugar should be below 95 mg/dL. One hour after meals, it should stay below 140 mg/dL, and two hours after meals, below 120 mg/dL. These stricter ranges are meant to protect both mother and baby. Women with preexisting type 1 or type 2 diabetes also have tighter targets during pregnancy and should work closely with their care team.
How Can You Check and Maintain Healthy Blood Sugar Levels?
Home blood sugar monitoring uses a small device called a glucometer. You prick your finger, place a drop of blood on a test strip, and get a reading in seconds. Continuous glucose monitors (CGMs) are also available and provide real-time readings throughout the day.
To keep blood sugar in a healthy range, three factors matter most: food, physical activity, and medication. Eating balanced meals with fiber, protein, and healthy fats helps slow the rise in blood sugar after meals. Regular movement, even a 15-minute walk, helps muscles use glucose more efficiently. If you have diabetes, taking medication or insulin as prescribed is essential. Lifestyle changes alone can keep blood sugar normal for many people with prediabetes.
Frequently Asked Questions
Frequently Asked Questions
Is 140 blood sugar after eating normal?
For someone without diabetes, a blood sugar of 140 mg/dL two hours after eating is at the upper limit of normal. For people with diabetes, it is within the target range of less than 180 mg/dL.
What is a dangerous blood sugar level?
A blood sugar above 250 mg/dL that does not come down, especially with ketones, requires medical attention. A level below 54 mg/dL is severely low and dangerous if not treated quickly.
Can stress affect blood sugar?
Yes. Stress hormones like cortisol and adrenaline raise blood sugar, even without eating. This is especially true for people with diabetes, but it can also affect those without diabetes if stress is chronic.
What time of day should you test your blood sugar?
Fasting tests are done first thing in the morning before eating. Post-meal tests are done one to two hours after the start of a meal. Your doctor will tell you which times matter most for your situation.
