Modern potatoes? Modern vegetables? Modern eggs?
So far, the only examples we found refer to the modern packaging used for the product or the modern factory where it's made.
Pillsbury in 1930 goes one step further and talks about their "modern pancakes".
Breakfast should be good news as well as good food
try this modern kind of pancake
|Pillsbury Pancake Flour, SEP April 19, 1930
"Pillsbury made a discovery - Pillbury's Pancake Flour contains a new kind of flour, unusually soft, fine and delicate. It makes lighter pancakes, more tender, more delicious, easy to digest. Much better than the old-fashioned kind - truly modern pancakes."
Earlier in the text the ad stresses the importance of 'good health, good digestion', hence a pancake that is easy to digest must be good for you. Pepsi Cola uses a similar strategy in their series of ads from the 1950's where Pepsi is praised as a "modern, light refreshment". More about this in another blogpost.
 Modern Living series, for more info follow this link