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Studies conclude that caffeine intake improves the performance of short-term and working memory, specifically associating caffeine intake with a shortened reaction time. [1] However, these findings are inconsistent and other studies conclude that caffeine has a detrimental effect on working memory. [2]
"An 8 oz. cup of coffee can have close to or over 100 mg. of caffeine while the same size cup of green tea might have 50 mg. or less," explains Dr. Neha Pathak, MD, FACP, an Atlanta-based primary ...
According to the U.S. Food & Drug Administration, one eight-ounce cup of green tea contains around 30 to 50 milligrams of caffeine, compared to 80 to 100 milligrams in an eight-ounce cup of coffee ...
Products containing caffeine include coffee, tea, soft drinks ("colas"), energy drinks, other beverages, chocolate, [239] caffeine tablets, other oral products, and inhalation products. According to a 2020 study in the United States, coffee is the major source of caffeine intake in middle-aged adults, while soft drinks and tea are the major ...
What’s more, a 2017 University of Southern California study found that coffee drinkers were 26 percent less likely to develop colorectal cancer than non-coffee drinkers. And those who drank more ...
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.
Caffeine dependence can cause a host of physiological effects if caffeine consumption is not maintained. Commonly known caffeine withdrawal symptoms include headaches, fatigue, loss of focus, lack of motivation, mood swings, nausea, insomnia, dizziness, cardiac issues, hypertension, anxiety, and backache and joint pain; these can range in severity from mild to severe. [18]
According to the U.S. Food&Drug Administration, one eight-ounce cup of green tea contains around 30 to 50 milligrams of caffeine, compared to 80 to 100 milligrams in an eight-ounce cup of coffee ...