Does Menopausal Hormone Therapy Prevent Dementia? What the WHO Says (and Doesn't Say)

I'm 54 and considering hormone therapy for hot flushes. A friend told me that "hormones protect the brain". Is it true that they prevent dementia?

Your friend's idea has been circulating for years, but current evidence does not support it — and WHO guidelines address the topic directly, with a two-part answer.

What the WHO says

For women aged 65 or older, menopausal hormone therapy is not recommended for the specific purpose of reducing the risk of cognitive decline or dementia (conditional recommendation against). For women under 65 — including those in perimenopause or who experienced early menopause — the answer is different but equally clear: there is not enough evidence to advise for or against for that preventive purpose. And the guidelines remind us of the essential: hormone therapy primarily serves to relieve symptoms (hot flushes, genitourinary syndrome), not to prevent dementia.

What this means for your decision

Your decision at 54 should be made for the right reasons: if hot flushes and other symptoms are significantly affecting your quality of life, hormone therapy is a legitimate and often effective option, to be discussed with your doctor or gynaecologist, weighing your individual risk profile (family history, cardiovascular risk, and breast cancer risk). What should not weigh in the balance is a supposed brain protection — that has not been demonstrated.

Beware of the two extremes

Neither "hormones protect the brain" (not demonstrated), nor "hormones cause dementia" (this is also not what the evidence says for most women around menopausal age). Science is genuinely halfway on this topic — and health decisions are best made with that honesty rather than with slogans from either side.

What truly protects, at this stage

Middle age is the ideal window for areas with solid evidence: regular physical activity, not smoking, moderate alcohol consumption, a balanced diet, and monitoring blood pressure, sugar, and cholesterol. If dementia prevention motivates you, that's where the effort pays off.