The upper limit of caffeine intake should be around 400 mg per day. When eating foods containing caffeine, we should be careful not to overdo it.
However, everyone has different acceptance of caffeine. Some people have a high acceptance of caffeine. They drink coffee, black tea, etc. Like water, some people will have symptoms such as shaking hands, palpitations and rapid heartbeat. For the former, it is recommended to strictly follow the upper limit of 400 mg of caffeine per day, while for the latter, it is recommended not to consume caffeine as much as possible.
Extended data:
On the premise of normal intake, caffeine has a refreshing effect on the human body. However, long-term excessive intake will have certain adverse effects on the nervous system and heart, which may lead to palpitations, hypertension, vomiting, mental disorders and even death.
If you have to take caffeine to refresh yourself, Dong Yang suggests that you choose black coffee or tea as much as possible, because besides caffeine, functional drinks also contain a lot of sugar, and excessive intake can also lead to health risks such as weight gain.
References:
People's Network-Attention! Long-term excessive intake of caffeine may lead to depression.