How high does blood sugar go?

Blood sugar levels can vary depending on several factors, including diet, physical activity, and overall health. Here are some general guidelines for blood sugar levels:

• Normal fasting blood sugar: 70–99 mg/dL (3.9–5.5 mmol/L)
• Prediabetes (impaired fasting glucose): 100–125 mg/dL (5.6–6.9 mmol/L)
• Diabetes: 126 mg/dL (7.0 mmol/L) or higher on two separate tests

After eating, blood sugar levels can rise temporarily. For non-diabetic individuals, blood sugar typically peaks at around 140 mg/dL (7.8 mmol/L) 1–2 hours after a meal and should return to normal within a few hours.

For people with diabetes, blood sugar levels can rise significantly higher if not properly managed. Consistently high blood sugar levels (hyperglycemia) can lead to serious health complications, including damage to the heart, kidneys, eyes, and nerves.

If you experience consistently high blood sugar levels, it’s important to consult with a healthcare professional for proper management and treatment.