The gut bacteria in some people have acquired genes for digesting seaweed fibres in a transfer from marine bacteria. We don’t know what effect this has on health, but it could be harmful
Source:
https://www.newscientist.com/article/2247750-eating-seaweed-can-genetically-modify-the-bacteria-in-our-guts/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home