Here's an interesting article from Xu Xiangcai on the Traditional Chinese Medicine view of food and nutrition. It answers the burning question "what should I eat?"
Chinese healthcare experts have always advocated light and simple diets. They believe that such diets can prevent diseases, strengthen the body and prolong life. Consumption of heavy, greasy, and sweet foods over a long period of time produces heat, phlegm, and dampness within the body and tends to cause illness. The Nei Jing says, “Heavy and greasy food causes a change that may result in serious illness.”
Take a look at the full article: "Traditional Chinese Health - A Simple and Light Diet"
Xu Xiangcai is the author of one of my favorite TCM books, Complete External Therapies of Chinese Drugs.