[alicorn]

Just Sweden does not eat an unreasonable amount of fish (see https://ourworldindata.org/grapher/fish-and-seafood-consumpt...). According to press release by Arla (the largest Swedish milk products company by far) some years ago (see https://www.arla.se/om-arla/nyheter-press/2015/pressrelease/..., in Swedish), there was a national study done by the government organization that controls foodstuffs which identified a large risk for vitamin D deficiency in general population, perhaps despite fish eating and law was passed making enrichment mandatory. So they are enriching.

Edit: removed sidenote about cooperation between government and private companies, since it seems that there is an actual law governing this stuff. Almost all milk, milk-like and fatty products (such as margarine), except cheese, must be enriched (see https://kontrollwiki.livsmedelsverket.se/artikel/448/livsmed..., in Swedish).

Edit++: Apparently data from the national study about food habits is available via an API which I think is super cute, see https://www.livsmedelsverket.se/om-oss/psidata/apimatvanor (also in Swedish, but hey, Google Translate is your friend)

[zepearl]

Puah - ok, that's surprising, at least for me :)

Thanks!