Winter is the season when kumquats are available in large quantities. Kumquats are rich in vitamin C and minerals, 80% of which are found in the peel. Kumquats are not suitable for everyone. Some people are not fit to eat kumquats, and eating them will not only bring benefits to the body, but also affect the health of the body. Kumquat also has the effect of regulating gas and resolving phlegm, anti-ulcer, quenching thirst, eliminating food, lowering blood lipids, etc. It can prevent vascular sclerosis, maintain heart function, and has a certain effect on chronic bronchitis. When eating kumquats should pay attention to the following points: 1 hour before eating kumquats should not drink milk, because the protein in the milk encounter kumquats in the fruit acid will solidify, not easy to digest and absorb, will be bloated and sad. It is also not advisable to eat more kumquats before meals or on an empty stomach, because the organic acids contained in kumquats will stimulate the mucous membrane of the stomach wall and cause stomach discomfort. People with weak spleen and deficient qi should not eat more, and people with diabetes, sore mouth and tongue, and swollen gums should not eat it. Elderly people with cold gastrointestinal, kidney and lung functions should not eat more, as it may induce symptoms such as abdominal pain and weakness of the waist and knees. Some children who eat too many kumquats may also experience what Chinese medicine calls “fire”, such as tongue inflammation, periodontitis, pharyngitis and so on. Children should not eat more kumquats. A good kumquat is a shiny orange or dark yellow, with a small gray circle at the bottom of the orange; from the side, the end with the long handle is concave. Thin skin, through the orange skin can smell a burst of fresh fragrance, with a light squeeze of the skin will emerge some oil out of the good oranges. Overly ripe pale yellow, green and greenish green, as well as the skin has holes in the orange is not suitable for selection.