The food for invigorating kidney and essence should be black sesame, Lycium barbarum, Black Mulberry, Black Bean, Black Rice, Auricularia auricula, Black Lentinus edodes, Black Douchi, Black Jujube, Black Grape, Blackcurrant, Black Mushroom, Black Straw Mushroom, Black Snakehead, Squid Fish, Sea Cucumber, Black-boned Chicken, Mume, Blueberry, Polygonum Multiflori Radix, Black Buckwheat, Purple Rice, etc. As Chinese medicine says, "Five flavors enter the kidney first" and "Five colors are dominated by the five internal organs, and black is dominated by the kidney", in other words, it means that black and salty foods can enter the kidney most and first, and play a tonic role. "