Studies have found that some teas may help with cancer, heart disease, diabetes, weight loss, high cholesterol, even some mental health issues. Tea also appears to have antimicrobial qualities.
“There doesn’t seem to be a downside to tea,” says American Dietetic Association spokeswoman Katherine Tallmadge, MA, RD, LD. “I think it’s a great alternative to coffee drinking. First, tea has less caffeine. And their flavonoids are good for the heart and may reduce cancer.”
Although a lot of questions remain about how long different teas needs to be prepared for the most benefit, and how much you need to drink, nutritionists agree any tea is good tea. Still, they prefer brewed teas over bottled to avoid the extra calories and sweeteners.
So which are the best teas for you?
Tea is a name given to a lot of brews, but purists consider only green tea, black tea, white tea, oolong tea, and pu-erh tea to actually be tea. They are all derived from the Camellia sinensis plant, a shrub native to China and India, and contain unique antioxidants called flavonoids. The most potent of these, known as ECGC, may help against free radicals that can contribute to cancer, heart disease, and clogged arteries. All these teas also have caffeine and theanine, which affect the brain and seem to heighten mental alertness.
The more processed the tea leaves, usually the less polyphenol content. Polyphenols include flavonoids. Oolong and black teas are oxidized or fermented, so they have lower concentrations of polyphenols than green tea – but their antioxidizing power is still high.
Here is a brief explanation of the benefits of different types of tea:
• Green Tea. Made with steamed tea leaves, it has a high concentration of EGCG and has been widely studied. Green tea’s antioxidants may interfere with the growth of bladder, breast, lung, stomach, pancreatic, and colorectal cancers; prevent clogging of the arteries, burn fat, counteract oxidative stress on the brain, reduce risk of neurological disorders like Alzheimer’s and Parkinson’s diseases, reduce risk of stroke, and improve cholesterol levels.
• Black Tea. Made with fermented tea leaves, black tea has the highest caffeine content and forms the basis for flavored teas like chai, along with some instant teas. Studies have shown that black tea may protect lungs from damage caused by exposure to cigarette smoke. It also may reduce the risk of stroke.
• White Tea. Uncured and unfermented. One study showed that white tea has the most potent anticancer properties compared to more processed teas.
• Oolong Tea. In an animal study, those given antioxidants from oolong tea were found to have lower bad cholesterol levels. One variety of oolong, Wuyi, is heavily marketed as a weight loss supplement, but science hasn’t backed the claims.