Most of us experience a boost of energy when we drink a cup of coffee, but what exactly happens to our brains when we drink our favorite brew?
Caffeine happens to have a similar structure to adenosine, causing it to compete with adenosine in the brain. When the adenosine can no longer bind with the receptors, the tired feeling the chemical causes goes away.
Sounds like a great way to keep alert, but the video points out that as you consume more caffeine, your brain starts to create more adenosine receptors. This results in needing more caffeine to keep up that energized feeling.
The video also draws a comparison to cocaine. Caffeine stimulates adrenaline, increasing your heart rate and blood flow. It also affects dopamine levels, creating a feeling of happiness. Moffit and Brown claim the effects of caffeine are the same as cocaine, but to a much lesser degree.
Just like any drug, you can have too much. But luckily for coffee drinkers, it's virtually impossible to overdose. The lethal dose of caffeine is around 150 mg per kg of your body. So if you weigh 150 pounds, it would take 14,000 mg of caffeine or 70 cups of coffee at 150 mg each to kill you. And you'd have to drink them all at once. Good to know for those who reach for multiple cups a day.
And if you're wondering why you feel the need for another cup around mid-afternoon, it's because caffeine has a half life of about six hours. If you drink a coffee with 150 mg of caffeine in it, six hours later, there is only 75 mg of caffeine left in your body.