Energy drinks. Energy drinks can increase mental alertness by improving brain function. Studies also confirm that energy drinks can improve memory, concentration, and reaction time and reduce mental fatigue. After 12 -24 hours, a sugar crash may occur, resulting in irritability and a decrease in mood. The withdrawal of caffeine can also cause
The amount of caffeine in a cup of coffee can vary based on the type, serving size, and bean variety. Coffee is the biggest dietary source of caffeine. You can expect to get around 95 mg ofBrewed coffee's caffeine content starts at approximately 95mg per 8-ounce cup and goes up from there. Surprisingly, coffee made from lighter roasts contain slightly more caffeine than darker roasts. Lighter roasted beans are a bit denser than beans that have been roasted for longer at higher temperatures.
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