Estrogen and Insulin Resistance

What the Most Cited Study in Menopause Research Reveals

When women hit perimenopause or menopause, one of the most frustrating changes isn’t just hot flashes or sleep problems. It’s what happens quietly under the hood: metabolism shifts, weight gain around the middle, and blood sugar issues. All of this often traces back to one hidden driver, insulin resistance.

That’s why a 2021 review by Dr. M. De Paoli, now one of the most cited studies in menopause and metabolic health, is so important. It pulls together decades of research to show how estrogen protects us from insulin resistance…and what happens when estrogen declines.

What the Study Looked At

Instead of running one new experiment, this review pulled together the best evidence from many studies on estrogen, insulin, and metabolism. The goal: to figure out how estrogen protects women against insulin resistance and why the loss of estrogen during midlife sets the stage for metabolic problems.

Key Findings in Plain Language

Here’s what the review found, boiled down:

• Estrogen is protective. Estrogen helps muscles and fat cells take in glucose more efficiently, lowering blood sugar and easing the burden on insulin.
• When estrogen drops, insulin resistance rises. This helps explain why many women suddenly notice weight gain, belly fat, and higher blood sugar around perimenopause and menopause.
• Estrogen receptors are everywhere. They’re in the brain, liver, fat tissue, and muscles—all places that influence how your body handles glucose. When estrogen declines, the whole system feels the shift.
• It’s not just about weight. Even women who aren’t overweight may become insulin resistant in menopause, which increases risks for type 2 diabetes, heart disease, and cognitive decline.

My Take

This study reinforces what many of us experience first-hand: midlife metabolism changes are not about “lack of willpower,” or not only about changes in diet and lifestyle, they’re about biology. When estrogen drops, the body doesn’t handle sugar and insulin the same way it used to.

The good news is, we can take action.

I recently ran a blood glucose monitor challenge in my Biohacking Menopause membership group (you’re welcome to join the next one!). What I found was eye-opening. I experimented with a few tricks to hack my blood sugar spikes, like apple cider vinegar with water, a berberine supplement, a couple dashes of cinnamon, eating salad or veg before the main meal, and moving my body after the foods that would typically spike me (for me, that was mostly fruit… turns out I was eating way too much).

While all of these strategies helped in different ways, the hands-down winner was movement. Whether I went for a 15-minute walk or just took 3 minutes to bang out 60 air squats, my blood sugar spike was either significantly blunted or barely showed a bump on the monitor. It was such a powerful reminder that exercise snacks are one of the simplest ways to keep blood sugar stable and body composition strong.

And here’s the thing: unfortunately, getting older doesn’t mean slowing down. It means we actually need to speed up and work a little harder. That may sound like a drag, but the truth is once these healthy habits get ingrained, they don’t feel like effort anymore. And the payoff is huge if, like me, aging powerfully is your jam.

So when we talk about insulin resistance in menopause, I see it as both a warning sign and an opportunity. We have the tools through hormones, lifestyle, and smart nutrition to keep our metabolism working with us, not against us.