Wait, no! Green tea is perfectly fine to drink once or twice a day. You might want to consider restricting yourself to two cups if you have a history of kidney stones, however, because both green and black teas contain high levels of oxalates that could lead to the formation of more, according to the National Institutes of Health. Keep in mind, though, that this isn’t super common (phew!), especially for those of us who aren’t susceptible to kidney stones.
Green tea is naturally loaded with polyphenols, which fight cancer, and it might even help you lose weight thanks to its fat-burning and metabolism-boosting abilities. Green tea can also help protect from Alzheimer’s, dementia and Parkinson’s (diseases that have been directly linked to damaged neurons in the brain) via catechin, a compound that keeps the neurons in the brain from becoming damaged via accidents or head traumas and natural deterioration over time. Those catechins can also kill the bacteria in your mouth that cause bad breath and fight off common viruses like the flu (but this isn’t an excuse to skip your flu shot!).
“Green tea has high amounts of antioxidants too,” Adler says. “They help your system naturally detox, slow down the aging process and reduce inflammation—which can heal injuries and distresses to the body.”