yo-yo dieting
noun
yo-yo di·et·ing
ˈyō-(ˌ)yō-ˈdī-ət-iŋ 
: the practice of repeatedly losing weight by dieting and subsequently regaining it
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“Yo-yo dieting.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/yo-yo%20dieting. Accessed 19 Apr. 2024.
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