The consumption of dark fish (such as salmon, swordfish, bluefish, mackerel, and sardines) may increase our risk of atrial fibrillation—an irregular heartbeat rhythm associated with stroke, dementia, heart failure, and a shortened lifespan.
Check out Boosting Heart Nerve Control for how we can improve heart rhythm function through diet, and check out my other videos on alcohol; caffeine; and the persistent organic pollutants that build up in the aquatic food chain. The mercury that accumulates in fish (see Cannibalistic Feed Biomagnification) can also affect brain function in children (see Maternal Mercury Levels), as well as in adults (see Fish Fog).
In 2022, I put up a new video on Afib. See The Best Diet for Treating Atrial Fibrillation.