PCOS in Women Over 40: Hormones, Insulin Resistance, and Metabolism Explained

What Is PCOS? Understanding Hormonal Imbalance in Women Over 40

Polycystic Ovary Syndrome (PCOS) is a common hormonal condition that affects how a woman’s ovaries function. It’s caused by an imbalance of reproductive hormones that disrupts normal ovulation.

In a healthy cycle, the brain releases two key hormones: 

• FSH: Follicle-Stimulating Hormone – helps the eggs inside the ovaries mature
• LH: Luteinising Hormone – triggers one of those eggs to be released (ovulation).

In women with PCOS, this balance is disrupted. FSH levels are often too low, and LH levels are too high.

This means several eggs start to develop, but don’t receive enough stimulation to mature and release. Instead, they remain as small, fluid-filled sacs on the ovaries – “polycystic” ovaries.

Because ovulation doesn’t occur regularly, progesterone levels stay low (progesterone is created after the release of an egg), while estrogen and LH remain elevated.

This lack of progesterone feedback causes the brain to continue releasing more LH in an effort to trigger ovulation. The ovaries respond to this constant LH signal by producing androgens – male-type hormones like testosterone.

• Elevated androgens reduce the sensitivity of muscle and fat cells to insulin.
• Blood sugar levels stay high as the insulin can’t remove the glucose from the blood.
• The body reacts by releasing more insulin to try and bring blood sugar levels down.

High insulin levels not only affect blood sugar, but they also directly impact the ovaries. High insulin levels stimulate the ovaries to produce even more androgens, so you end up with a vicious cycle:

This combination of:

• High LH
• Low FSH
• Elevated insulin 

Drives the hallmark symptoms of PCOS – irregular or missed periods, acne, unwanted facial or body hair, thinning hair on the scalp, and difficulty managing weight.

Perimenopause and PCOS: How Hormone Changes Affect Your Body After 40

As estrogen and progesterone begin to decline in your 40s, your hormonal landscape changes. For women with PCOS, these changes can play out differently:

• Cycle changes: Periods may become irregular again, sometimes lighter or heavier, as hormone production fluctuates.
• Insulin resistance: PCOS already increases insulin resistance, and the drop in estrogen during perimenopause can make blood sugar management more difficult.
• Fat distribution: You may notice more weight gathering around the midsection due to changing estrogen and cortisol levels.
• Mood and sleep: Hormonal imbalances can affect serotonin and melatonin production, making anxiety, irritability, and poor sleep more common.
• Muscle and bone health: With age and lower estrogen, women lose muscle mass faster — which slows metabolism and affects glucose control.

Is There a Cure for PCOS?

While PCOS is associated with low FSH and high LH, the problem isn’t simply that one hormone is “too low” or another is “too high.” The real issue lies in the communication loop between the brain, ovaries, and metabolism.

Here’s what happens:

• The brain controls the release of FSH and LH through rhythmic hormone pulses.
• In PCOS, those pulses fire too quickly, which favours LH over FSH.
• Insulin resistance and high androgen levels further disrupt this pattern, keeping FSH suppressed and preventing normal ovulation.

You can’t “fix” this by simply increasing FSH. While medications that boost FSH exist, they’re used short-term in fertility treatments (they override the imbalance rather than correct it). Once the medication stops, the same communication problems return.

The long-term solution isn’t forcing hormone levels up or down – it’s restoring balance so your body can regulate them naturally. That happens when you:

• Improve insulin sensitivity through strength training and balanced nutrition
• Prioritise stress management and quality sleep, which reduce cortisol’s effect on reproductive hormones
• Support a healthy body composition, helping stabilise estrogen and androgen levels

As insulin levels, inflammation, and androgens come down, the brain begins sending out more balanced signals. FSH and LH start working in sync again.

Managing PCOS in Women Over 40: The Path to Hormonal Balance

There’s no “quick fix” for PCOS, but there is a science-backed way to support your body through nutrition, exercise, and daily habits.

1. Prioritise protein and balanced meals

Eating protein at every meal (especially breakfast) helps stabilise blood sugar, reduce cravings, and support muscle maintenance.

2. Strength training is essential

Strength training 2–4 times per week is the most effective way to improve insulin sensitivity, balance hormones, and increase lean muscle.

3. Don’t undereat

Many women with PCOS unintentionally eat too little. Chronic restriction slows metabolism, increases cortisol, and makes symptoms worse. Fuel your body with whole foods, adequate calories, and steady energy intake.

5. Manage stress and sleep

Poor sleep and high stress worsen every symptom of PCOS – from cravings to weight gain.
Try setting a regular sleep schedule, limiting caffeine late in the day, and practising relaxation techniques before bed.

Want Help and Support?

If you’re ready to take control of your hormones, metabolism, and body composition, join my 4 Week Challenge – it’s designed specifically for women 40+.

You’ll learn exactly how to train, eat, and recover to lose fat, gain strength, and balance your hormones naturally.