📝 Detailed Answer
Many people mistakenly believe that 'low-calorie' options are harmless, but this often leads to increased bloating and fatigue. The physiological reason is that syrups and processed dairy cause rapid spikes in blood glucose, triggering insulin secretion and prompting the body to store excess energy as fat.
From the perspective of Traditional Korean Medicine (TKM), repeated consumption of these drinks can lead to the accumulation of 'Dam-eum' (痰飮), or phlegm-fluid. This represents metabolic waste resulting from impaired fluid metabolism. When Dam-eum accumulates, the body feels heavy and the basal metabolic rate slows down, making you more prone to weight gain even with a modest diet.
Furthermore, seeking sweet drinks as a response to stress can exacerbate 'Bi-heo' (脾虛), or Spleen Deficiency. When the Spleen's function is weakened, digestive and absorptive capacities diminish, leading to a lack of vital energy (Qi) and a loss of willpower to maintain a diet.
Ultimately, prioritizing your 'metabolic system' is more important than simply counting calories. I recommend sticking to pure teas or black coffee without additives. If your metabolism has already been compromised by long-term dietary habits, it is most effective to visit a clinic for a professional assessment of your constitution and metabolic state.