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Sardines specifically, because they are small, and therefore have amassed less mercury than the other commonly eaten fatty fish.

Plus because they're eaten whole, you also get bonus stuff like calcium and phosphorus from the bones.

Not everyone eats them whole. In fact of all people I introduced to sardines in the US as a Pole, as far as 2015, all of them remove the backbone.

Meanwhile I hope the social media influencers leave herring alone and move on to mackerel.