Digging through whatever magical suitcase they have in their possession, Vox found this old ad showing Pepsi bragging about having more calories than a pork chop.
The 1942 ad placed in the New York Times tells a lot about the struggles facing America in that time period. The country had just entered World War II the year before and the war effort was scrambling to out fit a military fighting in Europe and the Pacific, while trying to overcome the economic devastation of the previous decade.
To the fledgling nutrition science and popular assumptions out there, what America needed was more energy, so the advertisers tried to highlight that in its pitch.
Why eat a crummy ol' tomato when you can get so much more food energy from a bottle of Pepsi?!
Apparently, this was part of a larger campaign.
They wholly embraced this image, using the slogan "The Drink with the Quick Food Energy".
So, it's not like they were hiding anything...