The NY Times article du jour is about how people have gotten bigger and healthier.
We are informed that in 1850, the average man was 5'7.4" tall and weighed 146 pounds (considered a "normal" weight by the obesity police), and today the average man is 5'9.5" tall and weighs 191 pounds (considered to be "overweight").
The healthiness and life expectancy of the big and "overweight" modern man is much better than for the "normal" weight 1850 man.
The empirical data shows that "overweight" people have better health, but why look at empirical data when the "Americans are too fat" theory seems to make everyone feel better.
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No one really knows why people are so much bigger today. One guy has a theory that it's better health of pregnant mothers.
Maybe the supposedly unhealthy food like Big Macs that we eat so much of today is actually good for us. Maybe it's the artificial hormones and antibiotics in the beef? No one knows.
Maybe big people have more children than small people? It's something that no one ever considers.