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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.
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]
For this study, researchers defined chronic caffeine consumption as drinking any caffeinated beverages — coffee, tea, soda, and energy drinks — five days during the week for more than one year.
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Caffeine's widespread appeal is due primarily to its mild psychostimulant properties, which increase alertness and cognitive arousal and diminish fatigue. [10] Caffeine also produces a wide range of other symptoms, including upregulation of the cardiovascular system, increased global cognitive processing, and improved physical functioning.
In fact, one small study of subjects who showed signs of memory problems found that over a 2- to 4-year period, people with lower blood levels of caffeine were more likely to develop dementia than ...
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.
A number of clinical studies have shown a positive association between caffeine ingestion and panic disorder and/or anxiogenic effects. [34] [35] People who have panic disorder are more sensitive to the anxiety-provoking effects of caffeine. One of the major anxiety-provoking effects of caffeine is an increase in heart rate. [36] [37] [38] [39]