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The U.S. Food and Drug Administration (FDA) says that most people can tolerate up to 400 milligrams of coffee a day—that lines up to between two and three 12 oz cups of the good stuff each day ...
The health effects of coffee include various possible health benefits and health risks. [1]A 2017 umbrella review of meta-analyses found that drinking coffee is generally safe within usual levels of intake and is more likely to improve health outcomes than to cause harm at doses of 3 or 4 cups of coffee daily.
A cup of black tea typically has 40 to 50 milligrams of caffeine but can have as much as 90 milligrams. Green teas and white teas will have less caffeine. Green teas and white teas will have less ...
Drinking more than four cups of caffeinated coffee in a day was associated with a lower risk for head and neck cancer, oral cavity cancer, and oropharyngeal cancers compared to not drinking coffee.
In general, one serving of coffee ranges from 80 to 100 milligrams, for a single shot (30 milliliters) of arabica-variety espresso, to approximately 100–125 milligrams for a cup (120 milliliters) of drip coffee. [10] [11] Arabica coffee typically contains half the caffeine of the robusta variety. [9]
Caffeine is found naturally in various plants such as coffee and tea. Studies have found that 89 percent of adults in the U.S. consume on average 200 mg of caffeine daily. [2] One area of concern that has been presented is the relationship between pregnancy and caffeine consumption.
Moderate coffee drinkers who drank two to three cups per day were almost 50% less likely to develop cardiometabolic disease than people who consumed a cup a day or less, according to the 2024 study.
There is no standard value for "a cup of coffee." The caffeine content of cola drinks and most energy drinks can be difficult to determine, because in many cases the labels do not indicate the dose per serving. Caffeine doses in these beverages range from 20 to 30 mg in some soft drinks, up to 350 mg or more in some energy drinks.