How Caffeine Affects Your Body
Posted on November 15, 2012 Comments (16)
From the video by Alex Dainis: Caffeine prevents adenosine from slowing down your nervous system, by binding to the same receptors adenosine would. Caffeine also stimulates the production of adrenaline. And it increases the amount of dopamine present. The average half life of caffeine in the human body is about 6 hours.
I have been curious about the caffeine content of various drinks and writing this post is a good enough reason to actually look it up.
- expresso (2oz) 100 mg (varies – 60 mg to 180 mg)
- coffee (8oz) 100 mg – this can vary quite a bit, 50 to over 100 mg is common. Brewed coffee has more caffeine 100-200 mg.
- Red Bull (8.2 oz) 80 mg
- tea (8oz) 20 to 80 mg (depending on strength and type, can also be higher, green tea is on the lower end)
- Mountain Dew (12 oz) 54 mg (diet has 54 mg also)
- Diet Coke 46 mg (regular Coke 34mg)
- Pepsi 38 mg, Diet Pepsi 36 mg
Sprite, 7Up and some root beers have no caffeine.
Chocolate can also be a significant source of caffeine – dark chocolate can have over 80 mg per 100 g (approximately 4 ounces).