People are eating more calories than before… but pretty much all of the increase has come from processed foods.
In the graph above, you see how the population changed its eating habits in the past 120-130 years.
At the turn of the 20th century, people were eating mostly simple, home-cooked meals. Around 2009, about half of what people ate was fast food, or other foods away from home.
This graph actually underestimate the true change, because what people are eating at home these days is also largely based on processed foods.