Quaker Oats added Life to their line of breakfast cereals in 1961. I have to guess that Jay Ward was commissioned to produce the animated introductory ad, narrated by----who else?----Paul Frees.
A few years later, Quaker went for a more cerebral approach with "The Great Life Debate", a series of ads that featured Paul Winchell "debating" Jerry Mahoney and 50's exercise instructor Debbie Drake with a young gymnast. The Winchell spot has previously been covered.
Of course, the most famous ad campaign introduced America to "Mikey" in the 70's.