I recall a time when I survived on a single cup of Americano to get through my busiest days. At the time, it felt efficient, but over time, I began to feel dizzy and my energy levels plummeted. I learned this the hard way through personal experience. Caffeine-based drinks have clear advantages: they temporarily boost metabolism and can suppress appetite. However, the downsides are equally distinct. Consuming them on an empty stomach irritates the gastric mucosa. In particular, those with 'Bi-Heo' (Spleen Deficiency)—a weakness in the spleen's function—may experience further decline in digestive power, which can paradoxically lead to increased edema (swelling). Artificial sweeteners in zero-sugar drinks are also problematic. They continuously stimulate the taste buds, often leading to cravings for even stronger sweetness. In Traditional Korean Medicine (TKM), effective weight management depends on the efficient removal of 'Dam-Eum' (phlegm-fluid retention) and 'Eo-Hyeol' (blood stasis). However, relying solely on cold drinks or caffeine can cool the body, which actually slows down this vital circulation. Ultimately, the answer depends on your current physiological state. Those with slow digestion and a cold constitution would benefit more from warm-natured teas, while those with excess energy who need to be grounded may find an Americano acceptable. The smartest approach is to assess your body's internal balance first and choose a beverage that supports that equilibrium.