It seems that the statement "blood flow doesn't tell you anything about neural activity" is definitely not true: https://www.nature.com/scitable/blog/brain-metr

It seems that the statement "blood flow doesn't tell you anything about neural activity" is definitely not true: https://www.nature.com/scitable/blog/brain-metrics/what_does_fmri_measure/ https://www.nature.com/scitable/blog/brain-metrics/what_does... Also, it seems dangerous to suggest rejecting studying a specific area because the scientific tools and our understanding around it are currently limited - this is what science is for after all. If we thought this way, we wouldn't have nutrition research.