Lettuce: Lettuce contains more dietary fiber and vitamin C than cabbage, which can eliminate excess fat, so it is also called slimming lettuce. Because its stems and leaves contain lettuce, it tastes slightly bitter, and has the effects of analgesia, hypnosis, lowering cholesterol and adjuvant treatment of neurasthenia. Lettuce contains mannitol, which has diuretic and blood circulation promoting effects. Lettuce also contains an "interferon inducer", which can stimulate normal cells to produce interferon, thus producing an "antiviral protein" to inhibit the virus.