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Wall-E was made when obesity was already insanely out of control. It was a commentary on society, not a prediction.

"The youth of today is lazy and stay indoors all day unlike our generation" – evergreen complaint documented going back at least 2000 years. Aristotle was ranting about "millennials" in 4 BC. https://www.bbc.com/worklife/article/20171003-proof-that-peo...

"evergreen" but context matters. If these were issues that were raised during the decline of civilizations then it's still valid.

I mean, look at Greece now.

Are they unusually obese?

Well, the thing about evergreens is that they keep getting taller...

The fact is, generations differ in both behavior and physical properties.

physical activity was controlled for

Can you really control for that when our lifestyle has fundamentally changed over time? Washing dishes by hand is something I have stopped doing since 1990 as an example.

but not sleep