![]() ![]() They also did not include caffeine-containing foods in the study, although such amounts tend to be quite small compared with the beverages studied. For example, an 8-ounce serving of coffee from Starbucks can have twice the caffeine as a similar-sized serving from a Keurig K-Cup. ![]() But caffeine content in different caffeinated beverages can vary widely. Instead, they defined one serving of a caffeinated beverage as 8 ounces of regular coffee, 6 ounces of tea, a 12-ounce can of caffeinated soda, or 2 ounces of an energy drink. One weakness of this study is that the researchers did not actually measure caffeine consumption. Interestingly, the link was observed regardless of whether the study subject believed that caffeine triggered their headaches.
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