2. Beef (fat and lean): Beef is rich in protein, and its amino acid composition is closer to the needs of human body than pork, which can improve the body's disease resistance. It is especially suitable for people who are recuperating after surgery and illness, such as supplementing blood loss and repairing tissues. Eating beef in cold winter can warm the stomach and is a good tonic for this season. Beef has the effects of invigorating the middle energizer, nourishing the spleen and stomach, strengthening bones and muscles, resolving phlegm and calming wind, quenching thirst and stopping saliva.