Which meridian focuses on the assimilation and transformation of food within traditional acupuncture theory?

The Spleen meridian is central to the process of assimilation and transformation of food according to traditional acupuncture theory. In Chinese medicine, the Spleen is considered vital for digestion and the transformation of nutrients. It is responsible for extracting the essential energy (Qi) from food and beverages, which is crucial for maintaining health and vitality. The Spleen also plays a key role in the production of blood and Qi by nurturing the body with the transformed substances from food, thus supporting various physiological processes.

The Stomach meridian is important in the initial processing of food but does not focus as directly on the transformation and assimilation aspect, as that function primarily resides with the Spleen. The Pericardium and Heart meridians are more associated with emotional and circulatory functions rather than the digestive process. Thus, the Spleen meridian is the correct answer, reflecting its primary role in the digestive and metabolic aspects of traditional Chinese medicine.