Because historically, people don’t stick to them, which creates a yo-yo effect, which paves the way for obesity.

因为从历史上看，人们不能坚持下去，这样会创造出摇摆不定的效果，反而为肥胖奠定了基础。

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If his scale hadn't been hooked up to the internet, sending and charting his weight, he would not have noticed the "seasonal yo-yo effect" in his weight, he said.

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