Omega-3 lipid decline observed in women with Alzheimer's, not in men

A new lipid-focused study finds that women with Alzheimer’s disease show a pronounced drop in unsaturated fats, including omega-3 fatty acids, in their blood compared with healthy women, while men with the disease do not show the same pattern. The finding points to sex-specific differences in the disease’s biology and raises questions about whether omega-3–rich diets or supplements could influence disease progression in women. The researchers analyzed blood samples from 841 participants and used high-precision lipid profiling to examine hundreds of fat molecules, suggesting that lipid metabolism may operate differently in women and men at the onset or progression of Alzheimer’s disease.

In the study, researchers measured 700 distinct lipids in plasma and found that, in women with Alzheimer’s, there was a significant increase in saturated lipids and a notable decrease in lipids containing unsaturated fatty acids, particularly those with omega-3 chains. By contrast, no comparable lipid shifts were observed in men with the disease when compared with cognitively healthy men. The analysis indicates that certain lipid pathways linked to omega fatty acids may be more closely tied to...