You'd be surprised.

We do for example have records of what 'in theory' Napoleon was giving his troops in the early 19th century and it isn't far off the numbers I listed. This is the 'ideal' situation, not when they were marching home from Moscow:

24 oz of bread, 8 oz of meat, 2oz legumes.

My own numbers were more bread focused with less meat, but on that note you saw how pissy some folks got when I suggested half that quantity of meat upthread.