> Broadly speaking, we eat a lot more than we used to: The average American consumed 2,481 calories a day in 2010, about 23% more than in 1970. That’s more than most adults need to maintain their current weight
Totally might be the case. I'm not sure, but I think I've seen good reasons to think this doesn't exactly line up though - increased wealth in different countries didn't match exactly, timeline wise.
You're doing the opposite - oversimplifying it. Why is calorie intake up is a legitimate, important question.