Why exactly do I need to be so careful with restaurant menus when I'm on a diet?

Many people experience 'brain fog' and bloating after eating out, often dismissing it as simple fatigue. From a conventional medical perspective, the primary issue with restaurant food is the 'blood sugar spike.' Foods rich in refined carbohydrates and sugars cause glucose levels to soar, prompting excessive insulin secretion that rapidly stores energy as fat. When combined with high sodium, this leads to edema and sluggish circulation, further reducing metabolic efficiency. In Traditional Korean Medicine, this state is characterized by 'Dameum' (痰飮) and 'Bi-heo' (脾虛). 'Dameum' refers to viscous metabolic waste created when fluid metabolism is impaired. The stimulating ingredients common in restaurant meals generate this waste, which obstructs the flow of Qi and Blood between vessels and cells. If you are in a state of 'Bi-heo'—meaning your Spleen/digestive function is weakened—the situation worsens. A weakened Spleen fails to transform food into usable energy, instead allowing it to accumulate as waste. This creates a physiological environment where losing weight becomes significantly harder. The core issue is not simply high calories, but that dining out can compromise your body's natural purification system. Rather than extreme fasting, the priority should be restoring your metabolic capacity and improving overall circulation.