You can eat oranges when you have an upper respiratory tract infection, but you should pay attention to the temperature of the oranges when you first buy them, such as when you take them in from outside when they are cold and icy, try not to use them at that time, put them at room temperature so that they basically balance with the room temperature before eating. In addition, although oranges contain vitamin C, which can help fight upper respiratory tract infections, but because the planting technology is now good, the sweetness is very high, in this case must drink more water, because the sweeter you eat the body will urinate, so the blood is more concentrated, so be sure to replenish enough water. When you have a cold, people are very dehydrated, drink enough water if you rest well, the sweating itself can make the cold heal itself, so when you eat oranges, you must pay attention not to eat too sweet, and also drink more water. Generally in moderation is better, if a lot of eating later, blood sugar even if drinking water is not easy to come down.