Normal blood glucose values should be between 3.9 - 8 mmol/L.
Fasting blood glucose (> 8 hours not eating or drinking anything except water) should preferably be below 7.0 mmol/L.
Peaks after eating should not exceed 8.0 mmol/L. An occasional spike isn't too bad, though.
Values below 3.9 mmol/L are in general fine, in case you are not diagnosed with diabetes. Do keep track of energy during these levels.
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