In TCM, the body is in a state of yin and yang. Yin is cool and soft, while yang is warm and dry. Yin organs include the lungs, spleen, kidneys, pancreas, and stomach. Yang organs are heart, liver, gallbladder, small intestine, and large intestine. The five elements that correspond to these organs are wood (lungs), fire (heart), earth (liver), metal (spleen), and water (kidneys).
The concept of neutral proteins is based on the theory of Chinese medicine that all foods have a specific temperature or energy associated with them: hot or cold. Most meats are considered neutral because they are neither overly heating nor cooling in nature. Neutral proteins are considered an important part of your dog’s diet because they help regulate the flow of qi through the body’s meridians.