Americans at the beginning of the 21st
century are consuming more food and
several hundred more calories per person
per day than did their counterparts
in the late 1950s (when per capita calorie
consumption was at the lowest level in
the last century), or even in the 1970s.
The aggregate food supply in 2000 provided
3,800 calories per person per day,
500 calories above the 1970 level and 800
calories above the record low in 1957
and 1958 (fig. 2-1).
Of that 3,800 calories, USDA’s Economic
Research Service (ERS) estimates that
roughly 1,100 calories were lost to
spoilage, plate waste, and cooking and
other losses, putting dietary intake of
calories in 2000 at just under 2,700 calories
per person per day.
http://www.usda.gov/factbook/chapter2.pdf