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Hemoglobin A1c
Long-term blood sugar control marker
Also known as: HbA1c,Glycated Hemoglobin
Reference Ranges
Clinical Reference
4.0 – 5.6 %
Optimal Range
4.5 – 5.3 %
Critical Range
> 14.0
%
Reflects 2-3 month average glucose
Related Conditions
Diabetes
High
Metabolic Syndrome
High
Food & Lifestyle Recommendations
🍎 Food
Focus on low-glycemic meals with fiber, protein, and healthy fats at each meal
Mediterranean diet reduces HbA1c by 0.3-0.5% in meta-analyses
🏃 Exercise
Both aerobic and resistance training lower HbA1c; combined is most effective
Meta-analyses show 0.5-0.9% HbA1c reduction with regular exercise
Evidence-Backed Supplements
When High
-
Multiple RCTs show HbA1c reduction of 0.5-1.0%
Berberine HCl 500 mg 2–3x/day With meals -
Modest reduction in some meta-analyses
Chromium picolinate 200–1000 mcg/day With meals
Questions to Ask Your Doctor
- What is my actual estimated average glucose, and how does it compare to my meter readings? eAG = (HbA1c × 28.7) - 46.7
- Is my HbA1c elevation likely due to diabetes, or could other factors like anemia or iron deficiency be affecting it? HbA1c can be falsely low in anemia, falsely high in iron deficiency
Upload your blood test to see how your Hemoglobin A1c compares to reference and optimal ranges.
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