"Like many nursery rhymes, "Jack Sprat" may have originated as a satire on a public figure. History writer Linda Alchin suggests that Jack was King Charles I, who was left "lean" when parliament denied him taxation, but with his queen Henrietta Maria he was free to "lick the platter clean" after he dissolved parliament—Charles was a notably short man.An alternative explanation comes from the popular Robin Hood legend, applying it to the disliked King John and his greedy queen Isabella.
The saying entered the canon of English nursery rhymes when it was printed in Mother Goose's Melody around 1765, but it may have been adopted for use with children much earlier.
Here's the 1639 version:
Jack will eat not fat, and Jull doth love no leane. Yet betwixt them both they lick the dishes cleane.
And today? The Jack Sprat diet plan uses a guided day-by-day approach geared to gender, size and physical activity level...yes, it is a low-fat diet.
