In my clinical experience, repeated yo-yo weight gain is almost always rooted in spleen deficiency (biheo, 脾虛). When the spleen function weakens, the body cannot properly extract qi from food, and leftover residues accumulate as phlegm-fluid (dameum, 痰飮) or dampness (seup, 濕). Crash dieting or forcibly losing weight with Western medicine worsens spleen deficiency, making the body prone to gaining even more weight once normal eating resumes. I learned this the hard way before becoming a Korean medicine doctor, so I always emphasize a gradual, step-by-step approach. Step 1 (1–2 weeks): Soothe the spleen and stomach (biwi, 脾胃) with herbal medicine. Use herbs such as Astragalus (hwanggi, 黃芪) and Atractylodes (baekchul, 白朮) to calm excessive appetite and resolve bloating or poor digestion. Focus on comfort rather than weight changes. Step 2 (3–8 weeks): Replenish qi and blood (gihyeol, 氣血) to boost metabolism. Gradually adjust lifestyle rhythms (sleep, meal times). Weight may drop slowly, but you will feel lighter and less fatigued. Step 3 (9 weeks+): Establish a maintenance plan tailored to your constitution – whether spleen deficiency, phlegm-fluid, or blood stasis (eohyeol, 瘀血). No extreme restrictions; instead, learn to read your body's signals (swelling, constipation, fatigue). Ultimately, preventing yo-yo effect depends on the body's capacity to 'accept' weight loss – what TKM calls spleen qi (bigi, 脾氣). Nurturing this power slowly is our core approach. Since individual differences exist, I recommend visiting a clinic for a personalized plan.