Insulin Resistance, Menopause, and Weight Gain
If you're gaining weight during menopause and can't seem to stop it, insulin resistance is likely a major factor — even if your doctor hasn't mentioned it. The connection between oestrogen and insulin is one of the most under-discussed aspects of menopause, and understanding it can completely change your approach to weight.
Oestrogen helps your cells respond to insulin. When oestrogen drops during menopause, your cells become less sensitive to insulin's signals. Your body compensates by producing more insulin. High insulin levels tell your body to store fat — especially visceral belly fat — and make it nearly impossible to lose weight regardless of how much you eat or exercise.
This isn't a willpower problem. It's a hormonal and metabolic shift that requires a specific approach.
The oestrogen-insulin connection
Oestrogen improves insulin sensitivity through several mechanisms: it helps muscle cells take up glucose, it reduces liver glucose production, and it supports healthy pancreatic beta-cell function (the cells that produce insulin).
When oestrogen drops during menopause, all of these functions decline. Your muscle cells take up less glucose, so more stays in your blood. Your pancreas responds by pumping out more insulin. And high insulin — even if your blood sugar is still "normal" — signals your body to store fat.
This is why you can have "normal" blood test results and still be insulin resistant. Standard fasting glucose and HbA1c tests don't catch early insulin resistance. Fasting insulin or a HOMA-IR calculation is more revealing.
How to know if you're insulin resistant
Common signs of insulin resistance during menopause: belly fat that doesn't respond to diet, fatigue after meals (especially carb-heavy meals), brain fog, sugar cravings, skin tags, and darkened skin in skin folds (acanthosis nigricans).
If you want to test, ask your doctor for: fasting insulin (ideally below 8 mIU/L), fasting glucose, and HbA1c. You can also calculate HOMA-IR: (fasting insulin x fasting glucose) / 22.5. A HOMA-IR above 2 indicates insulin resistance, though some experts use a lower threshold for women in menopause.
Reversing insulin resistance during menopause
Strength training is the most effective intervention. Muscle is the largest consumer of glucose in your body. More muscle means more glucose uptake, less insulin needed, and less fat storage. Aim for 3-4 sessions per week.
Reduce refined carbohydrates and sugar. Every spike in blood sugar causes a spike in insulin. Focus on protein, healthy fats, and fibre-rich vegetables. You don't need to go zero-carb — just choose carbs that don't spike insulin.
Consider berberine. Several studies show berberine (500mg, 2-3 times daily) improves insulin sensitivity comparably to metformin. It works by activating AMPK, an enzyme that helps cells take up glucose. Discuss with your doctor.
Prioritise sleep. One night of poor sleep can temporarily worsen insulin sensitivity by 25%. Chronic sleep deprivation during menopause is a major contributor to insulin resistance.
Want to know what's really going on in your body?
Take the free Hormone Scan. It maps your exact symptoms to your hormonal profile and tells you precisely where to start.
Frequently Asked Questions
Does menopause cause insulin resistance?
Yes. Oestrogen helps your cells respond to insulin. When oestrogen drops during menopause, cells become less sensitive to insulin, and your body produces more insulin to compensate. High insulin promotes fat storage, especially belly fat. This is a direct hormonal effect.
Can insulin resistance be reversed during menopause?
Yes. The most effective approach combines strength training (builds muscle, which improves glucose uptake), reducing refined carbohydrates (reduces insulin spikes), adequate sleep (poor sleep worsens insulin sensitivity), and possibly supplements like berberine. Consistency over 8-12 weeks typically shows improvement.
What should my fasting insulin level be?
Ideally below 8 mIU/L. Many doctors don't test fasting insulin, and standard glucose tests can miss early insulin resistance. If you have menopause belly fat that doesn't respond to diet, ask specifically for a fasting insulin test and a HOMA-IR calculation.