Q. Diet coffees and bulletproof coffee seem to be trending these days. How exactly do they help with weight loss?

Modern diet coffees work by increasing fat intake to minimize insulin stimulation, encouraging the body to utilize fat as its primary fuel source. While the theory is sound, many people struggle when applying it without considering their individual body type. From a Traditional Korean Medicine (TKM) perspective, this method can be risky for those with 'Spleen Deficiency' (Bi-heo, 脾虛). When the function of the Spleen is weakened, the body struggles to properly metabolize 'heavy' substances like fats. If these fats are not processed correctly, they can accumulate as waste, leading to the formation of 'Phlegm-Fluid' (Dameum, 痰飮—abnormal fluid retention) or 'Blood Stasis' (Eohyeol, 瘀血—stagnant blood). Instead of weight loss, this can cause adverse effects such as a feeling of heaviness in the body and increased edema (swelling). Ultimately, the key is not 'what you drink,' but whether 'your body can handle it.' Rather than blindly following a trend, I recommend first evaluating your digestive capacity and metabolic state to take a personalized approach to your diet.