Women who start common hormone therapy in their 50s may have 23% lower dementia risk

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Women who start hormone replacement therapy (HRT) at a certain age may have a lower dementia risk, a new study suggests.

The study, published in Alzheimer’s &Dementia, analyzed UK Biobank data of 183,450postmenopausal womenaveraging 60 years of age.

The U.K.researchers determined that HRT use was associated with about a 10% lower risk of all-cause dementia and a 16% lower risk of Alzheimer’s disease over a 13-year follow-up period.

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The association was strongestamong womenwho started the therapy between the ages of 46 and 56.It was also high among those who had undergone surgical menopause.

Starting HRT after age 56 was not associated with reduced dementia risk.

Women who start hormone replacement therapy at a certain age may have a lower dementia risk, a new study suggests.(iStock)

Dr.Alexa Fiffick, a board-certified family medicine physician and founder of Concierge Medicine of Westlake in Cleveland, Ohio, noted that this was an observational study that can’t show cause and effect.

“So, it kind of stays where the data has been for a while — that in certain patients, we have no evidence that it really makes a difference,�

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“And, for some patients, such as [those] who go through menopause a little bit younger, whether that’ssurgicallyor naturally, or if they have that APOE ε4 genotype that predisposes them to dementia, there may be some benefit.”

Study limitations

The researchers also stated that since this was an observational study, it could not establish thatHRT prevents dementiabut only showed an association.

The study also did not assess any safety outcomes or adverse events related to HRT.

Women who use HRT may differ from non-users in other ways that affect dementia risk, such as their overall health, lifestyle or access to healthcare, the researchers noted.

There is some data linking menopausal symptoms, such as hot flashes and night sweats, with vascular changes in the brain, a doctor noted.(iStock)

Although researchers adjusted for many of these factors, some unmeasured differences could still factor into the lower dementia risk seen among HRT users.

The study also did not have detailed information on the types ofhormone therapy, the way they were administered or the specific dosages women took.

“If you’re having symptoms, if you feel not yourself, come in, talk to your doctor, have that conversation.”

Most of the people in the study were of European ancestry and tended to be better off financially, so the findings may not apply equally to people from other populations.

This study alone likely doesn’t warrant seeking out HRT just for dementia prevention, Fiffick said.

“However, if you’re having symptoms, if you feel not yourself, come in, talk to your doctor, have that conversation,” she advised.

There is some data linking menopausal symptoms, such as hot flashes and night sweats, withvascular changes in the brain, the doctor noted.

“So, we are very hopeful to see that treating those symptoms may prevent the vascular changes that lead to vascular dementia, but we just don’t have that data right now,” she said.

“So, it’s worth the conversation, it’s worth bringing up, but I wouldn’t go out of your way for just this purpose.”

HRT does carry some known risks and side effects, Fiffick noted.

For oral versions of estrogen, there may be an increased risk of blood clots.That risk does not appear to exist for transdermal options, such as patches, gels and creams.