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Did they accurately measure them in 1940? I would also think trace minerals vary at least a little based on geographical location.

Anyway here is a journal article by a Canadian govt scientist that refutes that minerals in food/soil is depleted:

> available in those same foods in 1940.

I guess most people today eat much more than five times the amount commonly available to people in the bloody days of WWII.

If so that's pretty upsetting and impossible unless you're a super athlete taking in 5x calories a day.

Trace minerals not calories

In order to take in those minerals you'd need to eat more, which equals more calories

Check the citation.