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Wikipedia

Yo-yo effect:

Yo-yo dieting or yo-yo effect, also known as weight cycling, is a term "yo-yo dieting" coined by Kelly D. Brownell at Yale University, in reference to the cyclical loss and gain of weight, resembling the up-down motion of a yo-yo.

溜溜球效应:

溜溜球效應（Yo-yo effect）也被稱為溜溜球節食方法，是指由於減肥者本身採取過度節食的方法而導致身體出現快速減重與迅速反彈的變化。