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After more exercise than usual, how long can blood sugar stay lower than normal?

Up to 24 hours, including overnight.

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  1. Up to 24 hours ✔
  2. Only during the workout
  3. Only for about 5 minutes

Why: Activity makes cells more sensitive to insulin, which is good, but it can lower blood sugar for hours afterward. Check before, during and after, and ask your care team how to prevent lows.

Huh, didn't know that: NIDDK suggests aiming for at least 150 minutes of moderate activity, like brisk walking, each week.

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References

Answer: Up to 24 hours. Activity makes cells more sensitive to insulin, which is good, but it can lower blood sugar for hours afterward. Check before, during and after, and ask your care team how to prevent lows.

  1. NIDDK, Low Blood Glucose www.niddk.nih.gov/health-information/diabetes/overview/preventing-problems/low-blood-glucose-hypoglycemia
    Increasing your physical activity level beyond your usual routine can lower your blood glucose level for up to 24 hours after the activity.
    Checked 2026-10-09.

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