Why Women React to Glucose Differently Than Men

For a long time, it was assumed that blood sugar responses in men and women were essentially the same. More recent research paints a different picture: hormonal fluctuations across the menstrual cycle, differences in fat distribution and muscle mass, and changes during perimenopause all influence how sharply — and how long — blood sugar rises after a meal.

The difference is especially striking in the second half of the cycle: many women show a more pronounced and longer-lasting glucose response to the same meal during the luteal phase than during the first half of the cycle. If you don't know this, it's easy to read fluctuating readings as personal failure — when really, it's biology.

Perimenopause plays a role too: as estrogen levels decline, insulin sensitivity shifts — and this often shows up first in overnight and morning glucose readings, long before other symptoms appear.

For your CGM program, this means one thing above all: you're evaluating your own curve — not the curve of an average man from a study conducted 20 years ago on mostly male subjects. That's exactly why it pays to measure over several weeks and identify the patterns within your own cycle.