Recently, the caffeine content of freshly made tea drinks, including milk tea, has sparked discussions among netizens. So, is there caffeine in milk tea? What are the effects of caffeine on the human body? Next, let's pay attention together. Is there caffeine in milk tea? When it comes to caffeine, people naturally associate it with coffee, but in fact, caffeine is not only present in coffee, such as tea, cola, cocoa powder, chocolate, which all contain caffeine to varying degrees. Milk tea does indeed contain caffeine, and the tea leaves in milk tea are the main source of caffeine. Whether it's black tea, green tea, or oolong tea, the tea itself contains caffeine. Caffeine is an alkaloid that does not only exist in coffee. What is caffeine? Let's listen to the expert's introduction. Professor Fan Zhihong from the School of Food Science and Nutritional Engineering, China Agricultural University: Caffeine itself is a type of alkaloid, which can be found in many plants. The "Assessment of Dietary Caffeine Intake Levels and Risks among Chinese Residents" released by the National Food Safety Risk Assessment Center in 2021 shows that caffeine, as a central nervous system stimulant, can be rapidly absorbed by the body after ingestion. Research has shown that caffeine can have various complex health effects on the human body. Positive effects include increasing the body's metabolic rate, relieving fatigue, and helping to prevent cognitive decline; Potential adverse reactions should mainly focus on the effects of caffeine on cardiovascular, skeletal, behavioral, and other aspects. High doses or long-term use of caffeine can lead to health risks such as "caffeine addiction". What is the safe daily intake of caffeine for healthy adults, 400 milligrams? The "Assessment of Dietary Caffeine Intake Levels and Risks for Chinese Residents" recommends that the safe intake of caffeine for healthy adults is 400 milligrams per day, and for minors under 18 years old, the safe intake of caffeine is approximately 175 milligrams. There are significant differences in the sensitivity of different populations to caffeine. Experts specifically suggest that there are significant differences in the sensitivity of different populations to caffeine, and safe intake refers to the reference range rather than the absolute value. Professor Fan Zhihong from the School of Food Science and Nutritional Engineering at China Agricultural University: Some people have strong metabolic abilities, and may have already metabolized half of their food within two to three hours after drinking. However, there are also some people with weak metabolic abilities, who may not have metabolized it in 10 to 8 hours. Therefore, the specific excitatory effect on each individual needs to be determined based on their physical sensations, as excessive caffeine intake may pose harm to people. (New Society)