Trying to get more magnesium into my dad, but he's not so hot on the supplement idea, and doesn't really buy the "depleted soil" theory. His question, if said depleted soil thing isn't a variable, is "What did people do for magnesium in the old days?"
Seemed like a fair enough question to me, so I will ask it on his behalf.
I have some theories about people visiting therapeutic mineral baths, spending time seaside where you'd be exposed to it from the sea spray or wading out into the water itself, drinking mineral water from special springs, unrefined sea salt, bone broths, adding lots of kale and other greens to soups, eating fish.
My thoughts for increasing his magnesium right off the bat would be to juice fresh veggies, to get a concentrated dose without having to eat his body weight in vegetables every day, and to make him fresh soups with bone broth at least once a week. I think he's already using Celtic Sea Salt.
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Best bet is going to be raw almonds. They also have a ton of vitamin E (which keeps the linoleic acid in them stable).
Epsom salt baths. Add magnesium to the water he drinks.
Tablets are not required to supplement. And this is the natural way.
Nobody's mentioned why soils weren't depleted in times gone by. Basically, we used to fertilie the land ourselves (apparently the book Humanure covers this - I haven't read it).
We also didn't farm in the same way that we do now. Monocultures & GMO crops have a lot to answer for!
I got my dad eating roasted pumpkin seeds and spinach, both high in Mg.
If he's a bath guy, dumping epsom salt in his bathwater is also easier than taking him to therapeutic baths.
Found this helpful resource: http://www.healthalternatives2000.com/minerals-nutrition-chart.html#magnesium
Would be nice if you could sort by highest levels in source though.
Eat potatoes every day. Also dark chocolate and spinach.