Here in the UK, I remember the slogan as ‘A Mars a day helps you work, rest and play.’
They were legally challenged to prove the statement, and I think got past that hurdle by saying that you got energy from eating one.
There was usually an attractive female model nibbling away.*
*Not as good as the blonde in the Cadbury’s Flake advert, who would happily suck the end of the chocolate.
Of course I cannot see a Doritos pack without thinking of the young lady who advertised them…
glee has it correct. the ad was playing off of the “an apple a day” thing. one mars (or milky way) per day. if nothing else it give you 6% of your daily calcium requirement.