How about black coffee?

The study also found that, for the average person, a cup of coffee in the morning and a cup of coffee in the afternoon have the best refreshing effect. If it exceeds this amount, it will not only fail to achieve the refreshing effect, but also make people fidget. Drinking too much coffee will also lead to the loss of calcium, which is a great threat to the elderly, especially middle-aged and elderly women. Two or more cups of coffee a day will increase the probability of fracture by about 50%, which is shocking. Experts believe that it is safest for the elderly to drink coffee once a day. Drinking too much coffee can easily lead to spontaneous abortion of pregnant women. Drink less coffee when your body has the following conditions or diseases. A developing child. Pregnant women. Old people. Before fasting (or before meals). Diarrhea. People with hyperacidity. People with gastric ulcer and duodenal ulcer. People with irritable bowel syndrome. A smoker. People who are prone to insomnia. Psychopaths. People who take sedatives. Health knowledge of drinking coffee for kidney patients who should limit their potassium intake. In addition, to enjoy the delicious coffee healthily, we must also pay attention to the following matters: 1. Drinking more than five cups of coffee every day (about 150cc per cup) is addictive and harmful to our health. Drinking coffee in the morning really helps to keep a clear head and full of energy, but you can't drink it until breakfast, otherwise it will easily hurt the gastrointestinal function. People with gastric and duodenal ulcers should especially avoid drinking coffee on an empty stomach. Don't drink coffee after drinking, otherwise it will stimulate blood vessel dilation, accelerate blood circulation and increase the burden of cardiovascular system. Drinking coffee for about ten to fifteen minutes will refresh you, so don't drink coffee before going to bed to avoid insomnia. Don't drink too strong coffee, otherwise it will make people impatient and weaken their understanding. (The heartbeat will also accelerate Yahui) 6. You can't smoke immediately after drinking coffee, otherwise it will easily cause harm to your heart. 7. Take antibiotics and drugs for treating gastric ulcer, and don't drink coffee at the same time, so as not to irritate the stomach and cause pain and discomfort. 8. When drinking coffee, it is best to add some creamer to relieve the irritation to the stomach, but both creamer and sugar have calories, so it is necessary to control the intake and avoid getting fat.