What did the 2025 meta-analysis find about hormone therapy?

A 2025 meta-analysis combining 17 randomized controlled trials and more than 29,000 participants, spanning research from 1998 to 2024, found that hormone therapy significantly reduced insulin resistance in healthy postmenopausal women without existing metabolic disease (Climacteric, 2025). This is not a small or preliminary finding, it is a large-scale synthesis presented at The Menopause Society's own annual meeting, specifically because of how consistent the result was across so many separate trials.

Does estrogen-only therapy beat combination therapy for insulin resistance?

One of the more specific findings: both estrogen-alone therapy and combined estrogen-plus-progestogen therapy reduced insulin resistance, but estrogen alone showed a more pronounced effect than the combination. This is a genuinely useful, specific detail to bring into a conversation with your doctor, since it means the type of hormone therapy, not just whether you take it, may matter for this particular outcome.

Why isn't diet and exercise enough for insulin resistance?

Diet and exercise remain the foundation, and nothing here changes that. But estrogen's decline is itself a direct driver of worsening insulin sensitivity, not just an indirect one through weight or lifestyle changes. A 2024 mechanistic study found that estrogen receptor alpha directly promotes insulin sensitivity in the liver by protecting a key signaling protein from degradation, a ligand-driven effect distinct from estrogen's better-known roles (Nature Communications, 2024). That means addressing the hormone directly is a genuinely separate lever from diet alone, not a redundant one. A woman doing everything right with diet and exercise may still be working against a hormonal headwind that hormone therapy specifically addresses.

Timing appears to matter here too: some research suggests estrogen therapy started in early menopause improves glucose handling, while starting it much later in postmenopause can have the opposite effect, another reason this is a conversation to have with a doctor rather than a decision to make from a blog post alone.

What should I ask my doctor about hormone therapy?

If insulin resistance, elevated fasting glucose, or a prediabetes diagnosis is part of your picture, it is worth asking specifically whether hormone therapy's metabolic effects are relevant to your case, not just its effects on hot flashes or bone density, which tend to dominate the usual conversation. Ask whether estrogen-alone versus combination therapy makes sense for you specifically, since that distinction showed a real difference in this research.

My Perspective

Hormone therapy conversations tend to center on hot flashes and, more recently, heart and bone health. Insulin resistance rarely comes up, even though the evidence for this specific benefit is substantial and recent. This is not a reason to feel like diet and exercise are pointless, they are not, but it is a reason not to assume you have exhausted your options if those alone are not moving the needle enough.

A note from Marilyn: This is education, not medical advice. Whether hormone therapy is appropriate for you depends on your full individual health picture and should be decided with your own healthcare provider. I am a nutrition specialist, not your physician.

The fuller picture of estrogen's role in metabolic health across menopause is in Estrogen Left the Chat: Biohacking Menopause. And Receipts can help you track how your own symptoms and numbers change alongside any treatment decision.

Frequently asked questions

Does hormone therapy actually improve insulin resistance, or just symptoms like hot flashes?

A 2025 meta-analysis of 17 trials and over 29,000 women found hormone therapy significantly reduced insulin resistance in healthy postmenopausal women, a distinct, well-documented metabolic effect separate from its better-known effects on hot flashes and bone density.

Is estrogen alone or combined hormone therapy better for insulin resistance?

The 2025 meta-analysis found both were effective, but estrogen-alone therapy showed a more pronounced reduction in insulin resistance than combined estrogen-plus-progestogen therapy, a specific distinction worth discussing with your doctor.

Should I try hormone therapy instead of diet changes for insulin resistance?

No, this is not an either-or decision. Diet and exercise remain the foundation. Hormone therapy addresses a separate, hormonally-driven part of the picture and is worth discussing alongside, not instead of, lifestyle changes.

Who was included in this research?

The meta-analysis included healthy postmenopausal women without existing metabolic disease such as diabetes, hypertension, or cardiovascular disease, aged 47 to 75, with treatment durations from eight weeks to two years across the pooled trials.