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Like most adults, I consume caffeine on a daily basis, and I’ve sometimes paid a price—especially in terms of insomnia. ... “so some people may experience unwanted side effects with a lower ...
Caffeine is energizing, but if it's impacting your sleep, it may be time to scale back.
The FDA’s recommendations regarding daily caffeine consumption for adults are uncomfortably noncommittal. Their 2023 report states that 400 milligrams a day is “an amount not generally ...
For reference, a brewed 8oz (227ml) cup of coffee contains ~95 mg of caffeine (per USDA). [6] According to the Diagnostic and Statistical Manual of Mental Disorders, caffeine overdose can result in a state of excessive stimulation of the central nervous system and the essential feature of Caffeine Intoxication is the recent consumption of caffeine.
Caffeine dependence can cause a host of physiological effects if caffeine consumption is not maintained. Withdrawal symptoms may include headaches, fatigue, difficulty concentrating, lack of motivation, mood swings, nausea, insomnia, dizziness, cardiac issues, hypertension, anxiety, backaches, and joint pain; these can range in severity from mild to severe. [18]
High caffeine consumption in energy drinks (at least one liter or 320 mg of caffeine) was associated with short-term cardiovascular side effects including hypertension, prolonged QT interval, and heart palpitations. These cardiovascular side effects were not seen with smaller amounts of caffeine consumption in energy drinks (less than 200 mg). [79]
If drinking coffee makes you tired or you don't feel its full effects, it may be due to your genetics, tolerance, or lack of sleep.
The half-life of caffeine is roughly 3–4 hours in healthy adults, however, it is dependent on a variety of variables such as age, liver function, medications, level of enzymes, pregnancy. [11] This short half-life has been found to help out daytime functioning, but increase the side effect of sleep problems.