Q. The 'Subway diet' customization is trending lately. What exactly is it, and why is it effective for weight loss?

For busy professionals, choosing a healthy lunch can be a daily struggle. The Subway diet is effective not just by cutting calories, but by preventing 'blood sugar spikes.' By scooping out the bread and filling it with vegetables, you reduce refined carbohydrates. Scientifically, excessive sugar intake triggers insulin surges that store energy as fat; reducing sugar shifts the body into fat-burning mode. In Traditional Korean Medicine, we interpret this through the concepts of Spleen Deficiency (Biheo) and Phlegm-fluid (Dameum). The Spleen, the central organ for transporting nutrients and digestion, easily becomes fatigued by excessive flour and sugary sauces. When the Spleen's transportive function fails, metabolic waste called Phlegm-fluid accumulates, leading to bloating and a weight-gain-prone constitution. Increasing vegetable intake and prioritizing protein lightens the Spleen’s burden and promotes the circulation of Qi and Blood. A healthy Spleen improves metabolic efficiency and reduces waste. However, those with a cold or sensitive digestive system should be cautious, as raw vegetables can further chill the abdomen. If you find it difficult to lose weight despite dieting, I recommend a consultation to see if accumulated Phlegm-fluid is hindering your progress.