Tianqi vegetables contain oxalic acid, which may bring discomfort to people with weak digestive ability if they consume them without blanching. However, Tianqi is not poisonous because oxalic acid is widely found in many green leafy vegetables. 100 grams of Radix Panax quinquefolium contains 23 calories, of which 4.2 grams are carbohydrates, 3.1 grams are protein and 0.1 grams are fat. It can provide the body with calories as well as carbohydrate nutrients. However, Tianqi vegetables contain a certain amount of oxalic acid. Vegetables with high oxalic acid content also include celery, leek, red amaranth, wild rice, bitter melon, spinach and so on. It is best to blanch this group of vegetables before cooking; most of the oxalic acid in them will dissolve in water and thus be removed from the food. Excessive consumption of oxalic acid may cause abdominal pain, diarrhea, nausea, vomiting and other adverse symptoms; at the same time, oxalic acid may affect the intake of calcium and zinc in the food, so that the absorption of calcium and zinc is abnormal, which may lead to the lack of the corresponding nutrients. The usual diet should pay attention to the dietary balance, not picky, partiality, and at the same time, combined with exercise, to maintain a good habit of life.