“Don’t wail on the scale if you cheat when you eat” is a jocular saying that has been printed on posters. The saying has been cited in print since at least 1976 and is of unknown authorship.
 
 
Google Books
God’s Answer to Fat…Loose It!
By Frances Hunter
Kingwood, TX: Hunter Books
1976
Pg. 23:
The doctor that God sent me to has a beautiful sign on his wall that says, “Don’t wail on the scale if you cheat when you eat.”
 
Google Books
The Complete Book of Zingers
By Croft M. Pentz
Wheaton, IL: Tyndale House Publishers
1990
Pg. 63:
Don’t wail on the scale if you cheat when you eat.
     
Health Discovery—Forum 
Re: I need a one-liner…
firechick139
04-01-2007, 10:21 AM
“DON’T WAIL ON THE SCALE IF YOU CHEAT WHEN YOU EAT!” 
 
Twitter
Che Garman
‏@AffirmYourLife
“Don’t wail on the scale if you cheat when you eat.”  Healthy Eating Affirmations http://bit.ly/N1usN
7:45 AM - 14 Nov 2009
 
Twitter
Steve Alessi
‏@SteveAlessi
Oh no…you must have had a bad Friday night. “@DanMunizzi: Don’t wail on the scale, and complain when you gain, if you cheat when you eat!”
10:56 AM - 21 Apr 2012