Not picky about food is a manifestation of the balance of yin and yang in the body. This is a good sign. Excessive preference for certain foods or excessive aversion to certain foods are manifestations of imbalance between yin and yang. As the saying goes, there must be something inside. For example, people who are cold and wet will not like cold and cool products, people who are wet in liver and gallbladder will hate fatty, sweet and greasy products, and people who are deficient in body fluid and heat will like sweet and moist products.