Spot check in Taoyuan shows that Japan's MisterDonut has the highest caffeine content.

Many people have the habit of drinking coffee, or even drink several cups a day, but drinking too much leads to excessive caffeine. Taoyuan County Health Bureau in order to know the sugar-free and cream-free black coffee sold by Taoyuan County chain Western-style fast food restaurants, convenience stores and coffee shops, the caffeine content was sampled in May. Yesterday, a random sampling survey of 32 black coffees on the market was announced, of which "Japan Mister Donut" had the highest content. Each cup amounts to 166 milligrams, and the least is 53 milligrams of Starbucks. Health Secretary Liu Yilian suggests that adults should not consume more than 300 milligrams of caffeine a day, which is equivalent to two to three cups of coffee, so as not to affect their health.

Liu Liwen, chief of the Health Inspection Section of Taoyuan County Health Bureau, said: the survey randomly sampled a total of 15 Western-style fast food restaurants, convenience stores and coffee shops, and calculated their caffeine content based on the average 240cc of one cup of coffee drink.

According to the assessment of the EU Food Science expert Committee, the amount of caffeine consumed per person per day is less than 300 mg, so black coffee with high caffeine content had better not drink more than 2 cups a day, so as not to endanger health, according to the health education article of Taitung Hospital of the Department of Health. Excessive caffeine can cause symptoms such as palpitations, restlessness, insomnia, headache, stomachache, blushing, nausea, frequent urination, and even muscle tremors. Long-term drinking coffee will produce psychological dependence. When coffee is stopped, withdrawal symptoms will appear, mainly headaches, tiredness, restlessness, nausea and vomiting, eager to drink a cup of coffee, and so on. A few people even become irritable and even depressed. In addition, long-term use of caffeine can worsen ulcers in people with stomach problems, palpitations or arrhythmias in patients with heart disease, symptoms in patients with anxiety disorders worsen or even reach a panic level, and pregnant women increase the risk of fetal malformations, underweight, premature delivery, and even death. Should be avoided.