Too many people can’t imagine a day without coffee or tea. And what about citizens of Northern Europe (Denmark, Scandinavia, Finland), where the coffee consumption is double to the Czech’s one.

Caffeine

More than a half of adult Americans consumes 300 mg of caffeine a day, whereas average caffeine content of a coffe cup of (150 ml) fo coffee is around 85 mg and instant coffee 60 mg. A cup of tea contains around 30 mg. Caffeine is a natural substance, purine alcaloid, which among others functions as an insecticide in nature and protects leaves against insect. Caffeine gets into blood vessels in 30 minutes after consumption. It is up to whether the coffee is with milk or black and you are on an empty stomach. Coffee with milk or cream rapidly decreases the effect of caffeine, because stomach mucosa is going to be covered by mucous coating, which obstructs to absorbtion of caffeine and the effect is much more weaker. Likely in cases of consumption of other milk products.

Adenosine

Adenosine has influence on releasing of blood vessels and caffeine then invokes their contraction by blockade of adenosine’s receptors and it leads to blood pressure elevations. Similarly the vessels in brain where caffeine can invoke headache but even damp it down. Headache is often invoked by nerves stimulation near by blood vessels and their sudden vasoconstriction can be the trigger or killer. That’s why anti-headache pills containe caffeine mostly.

Diuretic

Opposite situation happens in kidneys where caffeine causes increase of blood flow and hence increase of urine production. This diuretic effect toghether with increase perspiration after coffe consumption has a negative influence on metabolism of minerals. Moreover caffeine stimulates releasing of cortisone and adrenaline which stimulates blood pressure and heart frequence

Dopamine

Dopamine handles transport of nerve impulses and it is situated in dendrid from which it is released, sometimes less (caffeine, stress, excitement), sometimes more (cocaine etc.). Dopamine activates receptors, responsible for production of of effective substances with similar stimul. effect (increased attention, concentration etc.) or inhibitory effects. When caffeine stops taking effect, the releasing of dopamine decreases and get back to the neurons vesicle. For instance, cocaine obstructs to this process by blocking some kind of protein.

Advatages of coffee drinking

Reduction of risc of creation of bile stones

Relaxation of muscle of airways (asthmatic)

Protective effect against diabetes of type 2

Against Parkinson’s desease

Disadvantage of coffee drinkink

Negative effect on metabolism of minerals (ca, Na, K) in kidneys, thanks to diuretic effect

Increased acidity of stomach (gastric ulcer)

Discontinuation symptoms: sleepiness, tiredness, dislikes

Disharmonized metabolism due to unwise consumption