What Your Fasting Blood Sugar ISN'T Telling You #046

February 11, 2026•4 min read

Summary

Most women over 40 have been told their blood sugar is “normal” based on a fasting glucose test — and sent on their way. But what if that number is only showing you the very last chapter of a much longer story?

In this episode of Women Aging Powerfully, Leah Vachani breaks down why fasting blood glucose alone is an unreliable picture of your metabolic health — and the one number your doctor probably isn’t testing that could change everything.

Fasting insulin reveals how hard your body is actually working to keep blood sugar in range. Your pancreas can compensate for insulin resistance for years — sometimes over a decade — before fasting glucose ever looks abnormal. By the time glucose is flagged, significant metabolic damage may have already occurred. Research suggests that up to 80% of beta cell function can be lost before a fasting glucose test catches the problem.

Leah explains HOMA-IR, a simple calculation using fasting glucose and fasting insulin that provides a much clearer picture of insulin resistance, and walks listeners through what the numbers actually mean. She also addresses the difference between “normal” and “optimal” lab ranges — and why being compared to a population where only 12% of adults are metabolically healthy isn’t the reassurance your doctor thinks it is.

Layered on top of all this is the menopause multiplier: declining estrogen in perimenopause directly reduces insulin sensitivity, making women in their 40s and 50s more metabolically vulnerable at the exact stage when they’re least likely to be properly tested. Leah also touches on the emerging research linking insulin resistance in the brain to cognitive decline and Alzheimer’s disease.

The episode closes with practical steps: what labs to ask for, how to calculate your own HOMA-IR, what to look for in your body’s real-time signals, and how continuous glucose monitoring can provide personalized metabolic insights.

Bottom line: Your fasting blood sugar is not the whole story. And you deserve the whole story.

In This Episode, You’ll Learn:

Why fasting blood glucose is like a smoke alarm that goes off after the house is already on fire
What fasting insulin reveals that fasting glucose can’t
HOMA-IR: the simple calculation that tells you more about your metabolic health than most standard lab panels
Why “normal” lab ranges are based on a population that’s 88% metabolically unhealthy
How declining estrogen in perimenopause directly increases insulin resistance
The brain-insulin connection and why “Type 3 Diabetes” should be on your radar
Exactly what labs to ask for at your next appointment
How continuous glucose monitoring can give you personalized metabolic insights

Where to Listen:

🎧 Listen on Spotify

🎧 Listen on Apple Podcast

The information provided during this podcast is for educational purposes only. The speaker may be a licensed medical professional and may present case studies of actual patients or refer to patients' treatment during the program. Please be reminded that the Scope of Practice for Holistic Nutrition Professionals prevents us from diagnosing, preventing, treating, curing, prescribing, managing, or healing disease. Holistic Nutrition Professionals are not licensed in any state and work with clients, not patients.