Q. I walk for exercise, but why do people say the weight loss effect depends on the speed?

Many people believe that simply increasing the distance walked will lead to weight loss, but the efficiency of fat burning depends heavily on intensity. Our bodies prioritize blood glucose (carbohydrates) during low-intensity activity, and only shift toward burning stored lipids once the heart rate reaches a certain threshold. This transition point is the secret to effective weight management. From the perspective of Traditional Korean Medicine (TKM), this is viewed through the lens of 'Qi and Blood circulation.' Walking too slowly may fail to resolve 'Dam-eum' (phlegm-fluid retention, where bodily fluids stagnate and thicken) and 'Eo-hyeol' (blood stasis, where stagnant blood obstructs flow). Only when you walk at a pace that induces a light sweat does the Qi circulate effectively, allowing these accumulated metabolic wastes to be expelled from the body. However, caution is needed for those with 'Bi-heo' (Spleen Deficiency), characterized by weak digestive power and low energy. For such individuals, sudden high-intensity exercise can deplete their vital energy (Qi), leading to premature exhaustion. Therefore, the ideal pace is one where you are slightly breathless but can still maintain a conversation. Rather than focusing solely on duration, maintaining an optimal speed that revitalizes your body's circulation is the fastest route to managing body fat. If you are unsure of the appropriate intensity for your specific constitution, I recommend a clinical consultation for a personalized assessment.