Heather,
Plants also provide potassium, which people need. There is a fair bit of potassium in some seafood too, so I think people could survive mostly on a seafood diet, esp. if it included seaweed (which is high in polysaccharides). But inland people didn't have that option, so they would need animals and plants.
I can offer anecdotal evidence that potassium is hard to get from animal foods; at least for an active gal such as myself. I eat fish a few times a week - including whole fish. I eat bone stock-based soups a few times a week as well. But when I ate a highly carnivorous diet for a few months last spring, I got the early morning leg cramps from hell. Potassium supplements cured them. I also felt a muscle tightness that increased over time. As a martial artist this was not a good thing. So now I am back to enjoying some salads and other veg. And seaweed (a protoctist, not a plant!).
Inuit - especially inland tribes - are known for osteoporosis and a disease called tetany. I am pretty sure this is true of people on native foods beyond the age of 40. Google scholarly articles and books for more detail. That is exactly what I did during my carnivore stint. And what I learned was that they were not ALL so optimally healthy as some think. WA Price spent a season with the coastal Inuit. Stefansson lived with them (inland, I think) for a year. But there are other accounts that don't paint as rosy a picture for them long term.
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