As the Curtiss Candy Company explained during World War II:
"A non-energetic body is like an LCT without fuel."
Unfortunately, this ad is somewhat of a teaser because during the war, it was hard to find a Baby Ruth for sale:
"Men in foxholes, cockpits, or aboard ships call for more and more Baby Ruth, so civilians sometimes must wait until Uncle Sam is supplied."
James Lileks has lots more vintage ads from comic books here.
http://www.lileks.com/institute/funny/comicads/candy/index.html