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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]
Caffeine is the world's most widely consumed psychoactive drug. [20] [21] Unlike most other psychoactive substances, caffeine remains largely unregulated and legal in nearly all parts of the world. Caffeine is also an outlier as its use is seen as socially acceptable in most cultures with it even being encouraged.
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.
Caffeine does have benefits when it comes to getting active whether you’re running a race or lifting weights. It can delay the feeling of fatigue, make workouts feel easier, improves alertness ...
However, if caffeine doesn’t affect you too much, you may be able to drink it in the evening and sleep just fine; caffeine tolerance varies from person to person. The bottom line
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.
However, the MRI scans showed that drinking coffee increased activity in parts of the brain involved in short-term memory, attention and focus, whereas ingesting caffeine on its own did not.
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.