Many people experience this frustration; whereas in your 20s, skipping a few meals could quickly lighten your body, in your 50s, the same approach often leads to extreme fatigue without significant weight loss. Biologically, the period around age 50 is marked by drastic hormonal shifts. As hormones responsible for maintaining muscle and breaking down fat decline, the body tends to store energy rather than expend it—essentially, the 'metabolic switch' is turned off. From the perspective of Traditional Korean Medicine, this condition is analyzed through 'Spleen Deficiency (Bi-heo, 脾虛)' and 'Phlegm-Fluid (Dam-eum, 痰飮)'. Spleen Deficiency refers to a weakened digestive and transformative function. When the efficiency of converting nutrients into energy drops, metabolic residues remain in the body. These residues manifest as Dam-eum, which are abnormal accumulations of stagnant body fluids. If this is coupled with 'Blood Stasis (Eo-hyeol, 瘀血)'—where blood circulation is obstructed—the metabolic pathways become even more congested. This creates a detrimental cycle: [Spleen Deficiency → Decreased Energy Efficiency → Accumulation of Phlegm-Fluid and Blood Stasis → Metabolic Stagnation]. Therefore, simply fasting can further damage the already weakened Spleen function, increasing the likelihood of the yo-yo effect. At this stage of life, rather than blindly restricting calories, it is far more important to focus on treatments and management that clear these blocked metabolic pathways and restore internal harmony.