“Vegetables are a must on a diet. I suggest carrot cake, zucchini bread, and pumpkin pie”

Garfield, a comic strip created by Jim Davis, features a fat cat. In the book Garfield Eats His Heart Out (1983), Garfield gave the following diet tip:
 
“Vegetables are a must on a diet. I suggest carrot cake, zucchini bread, and pumpkin pie.”
 
The jocular line has been frequently quoted in food books and articles.
 
 
Wikipedia: Jim Davis (cartoonist)
James Robert “Jim” Davis (born July 28, 1945) is an American cartoonist, best known as the creator of the comic strips Garfield and U.S. Acres (aka Orson’s Farm), the former of which has been published since 1978 and has since become the world’s most widely syndicated comic strip. Davis’s other comics work includes Tumbleweeds, Gnorm Gnat and a strip about Mr. Potato Head.
 
Wikipedia: Garfield
Garfield is a comic strip created by Jim Davis. Published since June 19, 1978, it chronicles the life of the title character, the cat Garfield (named after the grandfather of Davis); his owner, Jon Arbuckle; and Jon’s dog, Odie. As of 2013, it was syndicated in roughly 2,580 newspapers and journals, and held the Guinness World Record for being the world’s most widely syndicated comic strip.
   
Google Books
Garfield Eats His Heart Out
By Jim Davis
New York, NY: Ballantine Books
1983
Pg. ?:
GARFIELD DIET TIPS:
1. Never go back for seconds—get it all the first time.
2. Set your scale back five pounds.
3. Never accept a candygram.
4. Don’t date Sara Lee.
5. Vegetables are a must on a diet. I suggest carrot cake, zucchini bread, and pumpkin pie.
 
Google Books
Dimensions of Food, Fifth Edition
By Vickie A. Vaclavik, Ph.D., Marjorie M. Devine, Ph.D. and Marcia H. Pimentel, M.S.
Boca Raton, FL: CRC Press LLC
2002
Pg. 81:
Vegetables are a must on a diet. I suggest carrot cake, zucchini bread, and pumpkin pie. — Garfield, Jim Davis
 
Google Books
250 Treasured Country Desserts:
Mouthwatering, Time-honored, Tried & True, Soul-satisfying, Handed-down Sweet Comforts
By Andrea Chesman and Fran Raboff
North Adams, MA: Storey Publishing
2009
Pg. 153:
Vegetables are a must on a diet. I suggest carrot cake, zucchini bread, and pumpkin pie. — Jim Davis, creator of the Garfield comic strip
 
Twitter
BIRD bakery
‏@BIRDbakerySA
Fruits and vegetables are a must on a diet. We suggest carrot cake, banana pudding, and pumpkin pie! http://instagram.com/p/yP9zs_LKxA/
2:12 PM - 24 Jan 2015
 
Twitter
Sarah Winter
‏@howtogetskinny_
Vegetables are a must on a diet. I suggest carrot cake, zucchini bread, and pumpkin pie. Jim Davis #diet #quote
11:05 AM - 22 Feb 2015