https://www.scientificamerican.com/article/a-gut-and-liver-check-to-get-a-bead-on-alzheimers/

Of all of our organs, our brains and hearts get the most attention. But the liver once held top billing, preeminent over the heart and mind as the seat of emotion and even the soul. As its name implies, we need our liver to live—not only because it works hard as a detox unit but also because it quietly processes components our brains need to thrive.

The Alzheimer’s disease (AD) research community is turning its attention to this liver–brain connection. That newfound interest turns up in a quartet of new studies presented July 24 at the Alzheimer’s Association International Conference 2018. The results may help provide clues to both the basic biology of AD and how diet is linked to brain health. More specifically, it may give insight into why human clinical trials of fish oil have failed to protect against AD and other forms of dementia.