A1c is the fingerprint of chronic glycemic exposure — roughly a 90-day average of how much glucose has been bonded to your hemoglobin. It doesn't tell you what you ate yesterday. It tells you what your fuel regulation has been doing for months.
What matters most is the direction over time under the same conditions — is the number trending toward the Fit band, or drifting away from it? Your Radar scores every marker 0–100 on the same four-band continuum you see on your report: Fit (90+), Well (50–89), Short of well (26–49), Sick (25 and under). A score of 25 is the diagnosable line at any age. The values below are the age-40 reference — the bands shift with your age and sex, so use the calculator underneath for your own numbers.
Sugar doesn't just float through the blood and disappear. It binds. It sticks to proteins, lipids, and DNA — warping structure and function. Once a molecule is glycated, there is no undoing it. The only fix is turnover: breaking down damaged tissue and rebuilding new.
Fast-turnover tissues can recover. Slow-turnover tissues — nerves, cartilage, vascular walls, connective tissue — carry the burden for years. This is why a person can be told they are "fine" while performance and recovery quietly erode.
A1c is the fingerprint of that chemistry — the share of hemoglobin bonded with glucose over roughly 90 days. Clinically, anything below 5.7% is considered normal. In coaching, we target the Fit band — below 5.4% at forty — with the interior around 4.6–5.0% reflecting the cleanest fuel regulation and lowest chronic glycemic exposure.
Each blood sugar spike adds another microscopic layer of glycation the body has to repair. At 5.7, medicine calls it prediabetes. At 6.4, diabetes. But glycation begins long before those diagnostic lines are drawn — and coaches live upstream of disease.
The education above is open to everyone. The specific levers — what to actually do to move this marker — are part of the coaching program. Enter your coach password to unlock, or get in touch about becoming a coach.
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