Magnesium calcium ratio + ancestral diets?
I'm not fully carnivore, but I've been reading about magnesium because I think I might be deficient in it. It seems that the recommended calcium to magnesium ratio is 2:1, with the recommended amount for magnesium being 420mg a day. I've been looking at the amount of magnesium in different cuts of meat, organ meats, dairy, vegetables, etc, and I just cannot wrap my head around how you are supposed to hit that 420mg of magnesium.
For example, ground beef is said to have around 5mg of magnesium per ounce, meaning that if you ate a pound of ground beef a day, you would be getting 80mg of magnesium. Fortunately, that same ground beef also has 5mg of calcium per ounce, so at least the calcium to magnesium ratio is reasonable.
I'm just struggling to see how ancestrally, humans would have consumed anywhere near 420mg of magnesium from just meat. Would this necessitate the consumption of nuts or other sources of magnesium?