I have personally experienced digestive distress from blindly following trendy diets, so I understand the struggle. While Subway sandwiches seem healthy due to the abundance of vegetables, they aren't a one-size-fits-all solution for everyone. On the positive side, the high fiber content provides satiety and makes it easy to manage carbohydrate intake. However, there are drawbacks. Consuming raw vegetables paired with cold drinks can lead to indigestion or abdominal pain, especially for those with 'Bi-heo' (脾虛), or a deficiency in Spleen Qi. Furthermore, highly stimulating or processed sauces can contribute to the formation of 'Dam-eum' (痰飮)—the accumulation of pathological fluids and metabolic waste in the body. In TKM, the ideal 'temperature' and 'flavor' of food vary by constitution. If you have a weak digestive system, I suggest lightly toasting your bread and opting for mild seasonings like olive oil or black pepper instead of heavy sauces. Ultimately, rather than searching for the 'perfect' menu, it is more important to observe how your body responds. If you frequently feel bloated or experience a cold sensation in your abdomen after eating, I recommend checking your internal physiological state before simply changing your meal combination.