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Cynically, that sort of tone is much more newsworthy than "exercise is good, health science is tricky and slow, so fads are probably bunk and anything is better than nothing". Write one timeless article like that and you're finished, but attacking the idiocy of whatever trend came before the current one is a stable opportunity.

(Even more cynically, it's the same dumb presentist instinct that shows up everywhere from film styles to foreign policy. "We've got to arm this faction because the stupid idiots before us armed that faction because the idiots before them armed the other faction...")

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