A rise in meat (esp red & cured meats) consumption and a drop in vegetable consumption would also do it, particularly if it were disproportionately occurring in

A rise in meat (esp red & cured meats) consumption and a drop in vegetable consumption would also do it, particularly if it were disproportionately occurring in certain cohorts. 12% of Americans eat half the nation's supply of beef, and members of that group are disproportionately male and disproportionately middle-aged.