Q. Doctor, is it okay to drink as much Americano or zero-calorie soda as I want during my diet? I'd like to know how they actually affect weight loss.

I once drank several cups of Americano a day during my practice, thinking it provided energy, but I eventually realized I was simply depleting my body's emergency reserves. First, the caffeine in Americano has a strong diuretic effect that drains 'Jin-yeok' (vital fluids), our body's essential moisture. When these fluids are insufficient, blood can become stagnant, a state known as 'Eohyeol' (Blood stasis), which significantly lowers fat-burning efficiency—much like running an engine without coolant. Zero-calorie drinks also require caution; their intense artificial sweetness confuses the brain. When the tongue senses sweetness but no glucose enters the system, the body eventually triggers intense cravings to compensate for the 'missing' energy. This process often leads to 'Bi-heo' (Spleen deficiency), where the digestive system weakens and fails to convert food into energy, leaving behind 'Dameum' (Phlegm-fluid/metabolic waste) instead. This is why some patients feel they bloat or gain weight even when drinking only liquids. The key to a successful diet is supporting the body's natural circulation rather than forcing it with stimulants. Choosing lukewarm water over coffee or soda is a much wiser choice for long-term health.