Glucose in your blood comes from your diet and is needed to produce energy. To convert glucose into energy, it has to reach your tissues. A hormone called insulin is needed for that. If your insulin levels are low or the hormone isn’t functioning properly, your blood glucose rises, which eventually leads to diabetes. Over time, high glucose levels may damage your blood vessels and are therefore bad for your heart’s health.
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The normal range for glucose after overnight fasting is 4 to 6 mmol/l. Sometimes fasting before a blood draw can cause it to dip slightly below 4 mmol/l and that’s OK.
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