Why some of my favorite food is forbidden by my TCM doctor or my acupuncturist?

In TCM, the food are divided into different natures: cold, cool, warm, hot, generate sputum, generate dryness, generate stagnation (obstruction), etc. So if you are a cold type person or your problem is cold by nature, the TCM doctor will suggest you avoid the cold or cool food but encourage you eat warm or hot food etc. Generally, spicy food is warm or hot by nature, many vegetables are cold or cool, some fruits are warm or hot etc. That is why.