90% of Americans consume it in some form every day. In fact, more than 450 million cups of coffee are consumed in the US daily.
Caffeine is an alkaloid that occurs naturally in more than 60 different plants, including coffee beans, tea, cocoa, and even some nuts.
Drip coffee typically contains more caffeine than espresso.
Darker roasted coffees tend to have less caffeine than lighter ones.
A caffeine overdose can be lethal. What, you ask, is the lethal dose of caffeine in humans? Roughly 150-200 mg per kg of body weight. That’s 100 cups of coffee in 4 hours. So, no worries.
First isolated in coffee in 1820, caffeine is the most widely taken legal drug in the world.
Caffeine is extracted by pressure-cooking beans and leaves with CO2 to produce the drug in powder form.
Caffeine increases the production of dopamine in the brain’s pleasure circuits and blocks adenosine receptors, which stops you from getting drowsy.
Caffeine works the same part of the brain as cocaine, amphetamines, and heroin. Only its effects are milder.
Caffeine has some adverse effects, such as insomnia, increased urination and diarrhea.
Caffeine benefits athletes and can improve endurance by reducing glucose burning and increasing fat burning.
Caffeine is completely absorbed within 30-45 minutes and its effects diminish within three hours.
Caffeine may be associated with physical and psychological dependence when consumed excessively. Withdrawals begin within 12-24 hours and can last two to nine days. Symptoms include headaches, tiredness, depression, irritability, and decreased energy.
Decaffeinated products still have caffeine in them. In the U.S., “decaffeinated” means that a product contains no more than 2.5% caffeine.