How can I prevent yo-yo weight gain after dieting?

Yo-yo weight gain is rarely a simple lack of willpower. It reflects the body’s attempt to return to its pre-diet set point through homeostasis; the crucial point is how that homeostasis was disturbed. We can divide this into two main situations. First, if you lost weight through extreme calorie restriction, your body adapts to the energy deficit by lowering its basal metabolic rate and entering a state of Spleen deficiency (脾虛). When Spleen function weakens, nutrients are not properly absorbed and transformed; instead, Damp-Phlegm (濕痰) accumulates, shifting your constitution toward one that gains weight easily. In this case, rather than abruptly increasing your food intake, it is better to slowly restore digestive function with herbal formulas such as those based on Bojungikgi-tang (Bu-Zhong-Yi-Qi-Tang). Second, if you used Western medications such as Wegovy or Saxenda and are now rebounding, these drugs suppress appetite or alter intestinal motility. Stopping them can disturb hormone balance, and residual Blood Stasis (瘀血) or Phlegm-Fluid (痰飮) may remain and cause metabolic disorders. Here, prescriptions that support Liver function and improve blood circulation—such as modified Sosiho-tang (Xiao-Chai-Hu-Tang)—are often considered. Ultimately, preventing rebound weight hinges on accurately diagnosing your current bodily state. At a Korean medicine clinic, pulse diagnosis and abdominal diagnosis are used to identify patterns such as Spleen deficiency, Kidney deficiency (腎虛), and Phlegm-Fluid retention. Based on this assessment, a practitioner tailors herbal medicine and lifestyle guidance to the individual. Listening to your body’s signals rather than forcing another extreme diet is the most sustainable and effective path forward.