I'm of the belief that we're going to die one way or another, likely from something we don't expect, so do what you can but still live your life. And this from a highly depressed, bipolar 2, ADHD, MDD, OCD, and anxiety sufferer with high blood pressure, a history of 3 strokes (2 this year), and high cholesterol.
If you like fish, it's obviously highly recommended. But then there are studies that say the microplastics and whatnot they're finding in fish will be the next big epidemic so then what?
Point is that you're going to die one way or another. If you can do something you enjoy to help, absolutely do it. But if it takes you out of being who you are or doing what you like, is it really worth it? Everybody will have a different opinion, but keep being you.