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The obesity epidemic is the result of the elites' misguided war against smoking
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The second mystery is how quickly the shift occurred. In 1975, there wasn’t a single country in the world with an obesity rate higher than 15%. In most countries, obesity was steady at about 10% until around 1980, when it suddenly began rising.
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fwiw
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The non-linear relationship between body fatness and BMI will tend to make observed obesity rates accelerate even if mean body fat increases at a constant rate and the variance remains constant (BF variance v. likely has increased, but less than BMI would naively suggest)
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