Coffee for many is the best way to start a new day. But is it so safe?

How to get the most out of coffee, bypassing harm, writes The Telegraph.

Everyone is used to thinking that coffee invigorates, especially in the morning. However, experts warn that the drink is not good for everyone. Coffee is a tonic drink, a few sips of which contain thousands of biologically active substances.

Among these substances there is caffeine, thanks to which coffee gives a feeling of vivacity, energy, sociability, well-being.

After we have drunk a cup of coffee, in 45 minutes almost 90% of caffeine enters the bloodstream and this feeling of vivacity and energy lasts another 2.5-4.5 hours, then caffeine is excreted from the body and replaced by a slight fatigue, especially if it is already in the afternoon and, especially, in the evening.

"Caffeine is a powerful stimulant: it makes you feel awake and focused, but the excess can potentially leave you anxious," experts warn.

"Too much caffeine causes you anxiety, nervousness, lack of sleep, nausea, headache and general anxiety," says nutritionist Thornton-Wood.

Caffeine belongs to weak psychostimulants. An example of a potent competitor to adenosine receptors is amphetamine, the weakest is theophylline (in dark chocolate).

If we drink coffee daily and a lot, insensitivity to caffeine may develop over time. Therefore, the most reasonable dose of caffeine is 300 mg per day.

Previously, researchers reported that coffee can cause kidney dysfunction.

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