Research Highlights A Gender Gap in Alzheimer’s Disease

Recent findings suggest that the way the female brain interacts with Alzheimer’s disease is particularly notable. There’s something intriguing about this increased vulnerability.

One study points to healthy unsaturated fats, like omega-3, as potential contributors to this phenomenon. Despite women generally having higher levels of these fatty acids compared to men, the study revealed a concerning lack of omega-3 among women diagnosed with Alzheimer’s.

Interestingly, the same lipid changes weren’t observed in men, indicating that the disease might affect genders differently.

This research brings attention to a long-standing hypothesis linking fatty droplets to Alzheimer’s, which has often been overshadowed by other indicators like tau tangles and amyloid plaques. These lipids are still significant markers, hinting that something isn’t quite right with how fatty acid metabolism functions in the brain.

A Lancet Commission for Dementia recently estimated that low-density lipoprotein (LDL), which transports cholesterol and fatty acids, accounts for around 7 percent of Alzheimer’s risk. This might help explain why women are diagnosed with the disease at double the rate of men, according to the study from King’s College London.

The team analyzed participants’ lipid profiles from six European countries. They found that those with Alzheimer’s had markedly higher levels of unhealthy saturated fats and lower levels of beneficial unsaturated ones, like omega-3, in comparison to their cognitively healthy counterparts.

One of the researchers, pharmaceutical scientist Cristina Legido-Quigley, emphasized the importance of women ensuring they’re consuming enough omega fatty acids in their diets, either from fatty fish or supplements. However, she noted that clinical trials are necessary to understand if adjusting lipid levels might affect Alzheimer’s progression.

The study delved into hundreds of lipids carried by lipoproteins such as LDL and HDL. Specifically, in women, various lipids correlated with Alzheimer’s, a trend that was not evident in men.

For women with Alzheimer’s, there was a notable decline in lipoproteins that are associated with omega fatty acids when compared to healthy women.

Julia Dudley, head of research at Alzheimer’s Research UK, stressed that while these findings suggest gender differences in fat levels related to Alzheimer’s, there’s still a need for further investigation. Understanding the specifics of these differences and whether lifestyle changes could influence them is crucial.

It’s worth mentioning that bias has existed in brain aging research, with just 5 percent of neuroscience studies published in 2019 addressing the effects of sex. Moreover, many Alzheimer’s drug trials also neglect to consider sex differences, leading to gaps in understanding why women are more prone to Alzheimer’s than men.

Dudley pointed out that knowing how the disease manifests differently in women could pave the way for tailored treatments and health guidance. Thankfully, ongoing research seems to be heading in that direction.

This study has been published in Alzheimer’s & Dementia.