You probably wouldn't see these products promoted this way in present-day marketing.
7-Up
"Why we have the youngest customers in the business"
September 12, 1955 Life Magazine
Chubbettes
"She can have a tummy . . . and still look yummy!"
August 20, 1956 Life Magazine
"Your chubby lass can be belle of her class"
August 19, 1957 Life Magazine
"How happy can a chubby girl be?"
August 18, 1958 Life Magazine
Jell-O
"It's National Use-Up-Your-Leftovers-in-a-Jell-O-Salad Week!"
May 11, 1959 Life Magazine
MobileOil
February 13, 1956 Life Magazine
Philip-Morris
"Born gentle"
February 13, 1956 Life Magazine
Post Sugar Crisp
This isn't too bad but it seems marketing teams don't play up "coated with sugar" anymore.
July 18, 1955 Life Magazine