It's not JUST your hormones...

Last time I wrote about brain fog and what it actually feels like when you're a woman who's used to being sharp. If you missed it, the short version: it's real, it's common, and it's not dementia.

But here's where it gets interesting. Should we just ride the wave, throw some HRT at it and hope for the best?

You could. But why not understand what's actually driving YOUR fog, and see what you can do to minimise it?

A standard GP appointment might acknowledge the fog and suggest HRT or "give it time." But when I look at this through a functional medicine lens, I'm asking a different question: which combination of these drivers is creating your particular version of brain fog?

1. Oestrogen fluctuations: Oestrogen doesn't just regulate your cycle. It's a major player in brain energy metabolism, neurotransmitter production, and blood flow to the brain. During perimenopause, oestrogen fluctuates wildly before declining, and the brain has to recalibrate. It's the fluctuation that causes the most disruption, not the absolute level.

2. Sleep disruption: Night sweats and hot flushes fragment deep sleep, and it's deep sleep that consolidates memory and clears metabolic waste from the brain. The SWAN study revealed significant disparities in sleep quality for Black women that they themselves didn't report. Poorer sleep quality was linked to inflammatory markers. So the fog may be partly driven by worse sleep that you don't even recognise as disrupted.

3. Stress and cortisol: Midlife is peak stress season: ageing parents, teenagers, career pressure, identity questions. Chronic cortisol literally shrinks the hippocampus, your memory centre. Mood changes during perimenopause compound this. Anxiety and low mood alter how much mental effort everything feels like it takes.

4. Thyroid dysfunction: Hypothyroidism mimics brain fog almost exactly and is more common in midlife women. Worth ruling out with blood tests.

5. Nutritional deficiencies: Low B12, vitamin D, magnesium, omega-3s, and iron can all impair cognitive function. These are common, mostly testable, and treatable.

6. Blood sugar instability: Insulin resistance becomes increasingly common in midlife and starves the brain of steady fuel. The crashes feel like fog. Many women don't connect their 3pm slump or post-lunch haziness to what they ate. The SWAN study found Black women entered the menopause transition with higher prevalence of metabolic syndrome, diabetes, and hypertension. All of these are independent drivers of brain fog.

7. Chronic inflammation: Low-grade inflammation impairs brain cell function. Diet, sedentary lifestyle, poor sleep, and stress all feed it. It's both a cause and a consequence of almost everything else on this list.

8. Your gut: The gut produces neurotransmitters including serotonin and communicates directly with the brain via over 100 million nerve cells. Gut inflammation or poor microbial diversity sends inflammatory signals straight to the brain. Addressing gut health often measurably improves cognitive symptoms.

You see the pattern? These aren't eight separate problems. They're a web, and they talk to each other. Stress worsens sleep. Poor sleep drives inflammation. Inflammation disrupts gut health. Gut dysbiosis affects hormone metabolism. And round it goes.

Wait, wait!! Don't unsubscribe yet!

There is good news!

(“Phew, I was just about to hit unsub from this prophetess of doom and gloom” 😜)

The functional medicine question isn't "do you have brain fog?" It's "which threads in YOUR web need attention first?"

Most of these drivers are modifiable. You don't have to accept the fog as your new normal. Next time: what you can actually do about it. Evidence-based, practical, and things you can start immediately.