America has much food and many diets. ““Americans have more food to eat than any other people and more diets to keep them from eating it” is a quip that has appeared in newspapers since 1959.
 
     
Google News Archive
2 March 1959, Sarasota (FL) Herald-Tribune, “It Happened Last Night” by Earl Wilson, pg. 11, col. 2:
WISH I’D SAID THAT…
Americans have more food to cat than citizens of any other country—and more diets to keep ‘em from eating it.—Quote.
 
15 September 1959, Altoona (PA) Mirror, “Tips For Teens” by Connie Notopoulos, pg. 17, col. 4:
Dr. Notopoulos: Americans have more food to eat than any person of any other country, and more diets to keep him from eating it.
CONNIE
 
25 October 1959, Chicago (IL) Daily Tribune, pt. 8, pg. 46:
Americans have more food per person than any other country in the world. And more diets to keep us from eating it.
   
Google Books
Forest Echoes
v. 19-21 - 1959
Pg. 17:
AMERICANS HAVE MORE FOOD THAN ANV OTHER PEOPLE IN THE WORLD - AND MORE DIETS TO KEEP US FROM EATING IT.
 
22 May 1960, Los Angeles (CA) Times, “Collection of Think Pieces Out of the Minds of Others” by Joan Winchell, by L5:
AMERICANS have more food to eat than any other people and more diets to keep them from eating it.
Ralph Rosen
     
Google News Archive
9 December 1960, The Dispatch (Lexington, NC),  “Americans Are Inconsistent, But Still Pretty Nice Folks,” pg. 24, col. 2
We’re the country that has more food to eat than any other country in the world and more diets to keep us from eating it.
 
Google News Archive
4 November 1962, St. Petersburg (FL) Times, “My favorite jokes” by Mart Rickey, Parade magazine, pg. 18, col. 2:
Americans have more food to eat than people of any other nation on earth and more diets to keep us from eating it!
 
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The National rural letter carrier
By National Rural Letter Carriers’ Association
v. 66 - 1967
Pg. 151:
Americans have more food to tickle their palates than any other people in the world — and more diets to keep them from eating it.
 
Google News Archive
25 October 1969, Daytona Beach (FL) Morning Journal, Earl Wilson entertainment column, pg. 17, col. 2:
EARLY PEARLS—Americans have more food to eat than people of any other country and more diets to keep them from eating it.
   
28 June 1973, Valley News and Green Sheet (Van Nuys, CA), pg. 41A, col. 7:   
Most Food, Diet
Americans have more to eat than the people of any other nation—and more diets to keep them from eating it.
 
Google Books
Winning the Diet Wars
By Meridee Merzer
New York, NY: Harcourt Brace Jovanovich
1980
Pg. 1:
Americans have more food to eat than any other people in the world — and more diets to keep them from eating it.
   
Google Books
14,000 Quips and Quotes for Speakers, Writers, Editors, Preachers, and Teachers
By E. C. McKenzie
Grand Rapids, MI: Baker Book House
1990, ©1980
Pg. 183:
Americans have more food to eat than any other people on earth, and more diets to keep them from eating it.