What exactly does a body fat percentage of 25% mean? I'm curious why this is so important when dieting.

Many people focus solely on the number on the scale, but the feeling of heaviness despite a stable weight often stems from a high body fat percentage. Medically, a high percentage means you have more energy-storing fat cells relative to lean muscle mass. When fat accumulates excessively, it can trigger systemic inflammation and increase insulin resistance, creating a constitution where calories are more easily stored as fat. From the perspective of Traditional Korean Medicine (TKM), this state is viewed as the accumulation of 'Dam-eum' (痰飮, phlegm-fluid). Dam-eum refers to a pathological state where bodily fluids fail to circulate properly and instead stagnate as a viscous, waste-like substance. Specifically, if a patient suffers from 'Bi-heo' (脾虛, Spleen Deficiency), the body fails to transform food into energy efficiently, leading to the continued accumulation of Dam-eum. If you attempt a crash diet by simply starving yourself in this state, you risk losing muscle mass rather than fat, further depleting your Qi (vital energy). Because your metabolic 'switch' is effectively turned off, the priority must be to resolve the stagnation and restore metabolic function. Understanding your specific body composition and internal state is the most effective way to achieve sustainable weight loss and prevent the yo-yo effect.