re: Medieval farmers ate 7000-9000 calories a dsy

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idea what the calories per day were, but I do know it took a huge amount of food to supply the crews building the transcontinental railroad. Which was all manual labor at that time. No steam shovels or track laying machines.

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Food is just fuel. You can’t run a battalion of tanks without diesel and people won’t work long without calories.
Not sure why people are having such a hard time with this. Seems like basic logic and a little math.