Your writing style is clever. It threw me for a loop--a good loop!
You give such great advice on the benefits of eating fish. However, right around the time, I was wondering what your sources were, I noticed underlined sentences--signifying hyperlinks.
And, then I realized those sentences linked to your sources: NHS, WebMD, Time, etc. Those credible sources gave your advice - significant believability. Very well done in including that information!
One suggestion: You may want to include a references section at the end of the story. Medium curators will look for it specifically.
I really enjoyed reading your article. There were some humorous spots, which I appreciated. Formating, Grammar, Voice, Conciseness were all great! Thank you for sharing!