Top "Vegetables" consumed in the United States

Excellent (alarming) statistic from one of the nutrition books I'm currently reading:

"Unbelievable as it may seem, one-third of all vegetables consumed in the United States comes from just three sources: french fries, potato chips, and iceberg lettuce."

Additionally, "people who eat five or more servings of fruits and vegetables daily seem to have half the cancer risk of people who eat only two servings."