The advantage of coffee is that it contains caffeine, which can refresh the mind, improve attention and memory, eliminate fatigue and help digestion. Tannic acid in coffee has a certain antioxidant effect, which can scavenge oxygen free radicals and delay skin aging. Coffee itself does not have a lot of calories and sugar, and it will not cause obesity. But the disadvantage of coffee is that your partner has more sugar and calories. If you drink it for a long time, it may affect blood sugar and lead to obesity. Drinking coffee for a long time will also lead to calcium deficiency, which will lead to osteoporosis. In severe cases, it will also cause backache and leg pain. For some people with excessive mental stress, drinking coffee may lead to insomnia, so these people suggest not to drink coffee.