How much tea a day is too much?
Moderate tea consumption of under 3 cups of tea a day can convey a myriad of health benefits, but drinking too much tea, which is exceeding 3–4 cups per day, has been linked to a few negative side effects.
Best for Overall Health: Green Tea
“Green tea is the champ when it comes to offering health benefits,” says Czerwony. “It's the Swiss Army knife of teas.
Green tea gets most of the hype for its potentially health-boosting properties, but black tea appears to offer plenty of health benefits, too. Retelny notes that scientific evidence suggests black tea may play a role in preventing cognitive decline, inflammation, heart disease, diabetes, and potentially cancer.
In this battle over health benefits, coffee comes out on top. Coffee drinkers can raise a mug to fiber, microbiome health and lowering risk for cancer and diabetes. But tea drinkers, do not despair. Tea is undoubtedly good for your blood pressure, cholesterol, stress levels, mental health and productivity.
Observational research has found that tea consumption of 2-3 cups daily is associated with a reduced risk of premature death, heart disease, stroke, and type 2 diabetes.  However, there may be an increased risk of esophageal and stomach cancers from drinking tea that is too hot (more than 131-140° F [55-60° C]).
Flavonoids help prevent cell damage. Team leader, Dr Carrie Ruxton, a Public Health Nutritionist, said tea is better for you than water because all water does is rehydrate you. Tea rehydrates you and provides antioxidants.
People with peptic ulcers or acid reflux should not consume green tea excessively. A 1984 study concluded that tea is a potent stimulant of gastric acid, which can be reduced by adding milk and sugar. 2.
Green tea is one of the most well-known types of tea, and is linked with many health benefits. It's also one of the most effective teas for weight loss. There is substantial evidence linking green tea to decreases in both weight and body fat.
A new study suggests that drinking black tea at least twice a day lowers the risk of death by up to 13%. Higher tea consumption also reduced the risk of heart disease and stroke.
The recommended maximum intake of caffeinated teas is no more than five 1-cup servings per day. However, choosing decaffeinated or caffeine-free teas, such as herbal teas, is a safe way of drinking six to eight cups of tea per day.
Is 9 cups of tea a day too much?
Drinking Too Much Tea May Cause Negative Side Effects
If you are drinking more than 9 cups a day, you might be overdoing it. Many types of tea contain caffeine which, when overused, can cause anxiety, unwanted stress, poor sleep, increased stomach issues, headaches, heartburn, and create caffeine dependency.
After consuming about six mugs in a day, you might experience some anxiety. If you down between eight and 10 daily mugs, you are at greater risk of caffeine intoxication, with effects ranging from restlessness and nervousness to digestive distress and increased heart rate.