Comment by rayiner

The starting point for that data is 1909, when average life expectancy was under 50 years and child malnourishment was a major problem. The change since 1970 has been much quite modest: http://ers.usda.gov/data-products/charts-of-note/chart-detai...

Also, you need to adjust for demographics. In 1900, 35% of the population was under 15: https://demographicchartbook.com/index.php/chapter-5-age-and.... Today it’s only 19%. Children and babies obviously eat a lot less meat than adults, and they make up a much smaller share of the population today than back then.