Don't cross 300mg with caffeine every day.

A digestion study at Stanford University School of Medicine in the United States has set a safe label for caffeine intake: no more than 300mg every day. A cup of coffee (size, a porcelain cup of hotel coffee shop) contains about 120mg caffeine, while a can of Coca-Cola contains about 55mg, and a cup of green tea contains about 15mg. Because of the irritation of caffeine, people with stomach problems or cowardly gastrointestinal struggle should not drink too much. People with hyperthyroidism and heartbeat who drink coffee will also cause heartbeat, excitement and other discomfort, and pregnant women or mothers who are breastfeeding should also avoid caffeine. In addition, coffee beans are roasted, so it is easy to get hot when drinking coffee, such as their hot and dry physique, easy to get angry, insomnia and dreamy partners should also be careful. People who know that they are not suitable for drinking coffee should try their best to avoid it, but if they are not happy to drink it, then of course they should choose a small cup to taste it.