I eat more canned fish than the average American, and have done so for years. I feel no different, and subjectively, I can’t keep track of things the way I used to. Words don’t come as easily as they used to, I forget what I wanted to look up in the 30 second trip to the computer, and complicated construction jobs I could keep track of in my head, I forget the details of, and have to look at the prints.
There’s no A/B testing, so maybe it would be worse if I didn’t eat a lot of fish. Maybe not ¯_(ツ)_/¯