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A small, 8.4-oz. can of Red Bull contains 80 mg of caffeine, and a concentrated, 2-oz. energy shot can contain a staggering 215 mg, according to the Mayo Clinic. Just how any one person will react ...
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]
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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 can cause a physical dependence, if consumed in excessive amounts. [3] The need for caffeine can be identified when individuals feel headaches, fatigue and muscle pain 24 hours after their last energy drink. [4] Some commercially distributed drinks contain guarana, a South American berry with a caffeine content about twice that of ...
The study, which enlisted 23 men with a "moderate habitual caffeine intake" (under 300 mg) between the ages of 18 and 40, discovered that while a 100 mg dose of caffeine can be consumed up to four ...
It is also found in tea, chocolate, soft drinks, energy drinks and medications. [4] The short term effects from caffeine are usually noticed after 5–30 minutes and long term ones last for up to 12 hours. [4] Those who use caffeine regularly, most often drinking at least one coffee a day, can become dependent and addicted. [5]