In extreme cases, it can cause epileptic seizures.That's because in excess, caffeine can cause: However, it's important you don't consume too much caffeine, which the FDA defines as more than four to five cups of coffee a day. ![]() Pure herbal teas such as peppermint tea and chamomile tea contain no caffeine at all. Length of time the tea is left to steepīlack tea, for example, contains 48 milligrams of caffeine, while green tea only contains 29. ![]() However, the exact ratio depends on several factors, including: "Generally speaking, coffee has two to three times more caffeine compared to a similar-sized black tea," says Matthew Chow, MD, an assistant clinical professor of neurology at the University of California Davis School of Medicine. One cup of tea, by contrast, only contains 30 to 50 mg of caffeine. Important: One cup of coffee typically contains 80 to 100 mg of caffeine, according to Christopher Gardner, PhD, the director of nutrition studies at the Stanford Prevention Research Center. ![]() They were also less likely to develop certain cardiovascular diseases, neurodegenerative diseases - including Alzheimer's and Parkinson's - and cancers like colon cancer, uterine cancer, and liver cancer. A large 2015 study found people who consume a moderate amount of caffeine have a lower risk for type 2 diabetes than people who do not consume any. Coffee and tea both contain caffeine, a stimulant that can make you feel awake and energized.
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