Can we have coffee after dinner?

According to the expert: That's why you shouldn't drink coffee after getting up.

Coffee after getting up? Why an expert advises against it and what is really the best time for the caffeine kick.

A morning without caffeine? For many this is unthinkable. Coffee after getting up is simply part of it and ensures that we can start the day with a little extra energy as soon as the alarm goes off. Get out of bed and head straight for the coffee machine? According to US nutritionist and author Laura Cipullo, this is not a good idea. As Cipullo explains to "CNBC", you should postpone your morning coffee consumption to a later time. (Also read: Study shows: This is how many cups of coffee you should drink a day)

That's why coffee is unhealthy after getting up

After getting up, the body produces the stress hormone cortisol. This causes the body to get excited, you feel restless - even without coffee. Anyone who reaches for espresso, cappuccino & Co. in the early morning intensifies this feeling even more. The morning coffee, combined with the body's cortisol output, can cause you to plummet later. As soon as the caffeine and cortisol have been broken down, a feeling of tiredness and weakness occurs. (Also interesting: Dalgona coffee: the viral social media drink that everyone makes during the Corona quarantine)

When to drink your coffee

Cipullo advises you to wait a while before having your first cup of coffee. "Drink coffee when your body is producing less cortisol, around three to four hours after you wake up." That means: if you get up at seven in the morning, you should wait until ten or eleven in the morning to have your first cup of coffee. "I would say mid morning or early afternoon is probably the best time to go. This is when your cortisol levels are at their lowest and you are getting the most benefit from the stimulant [caffeine, note]."

However, you shouldn't stop overnight with your usual cup in the morning - especially not if you have to drive in the morning. Here it is advisable to move your consumption to a later time step by step on days off and to get used to the new coffee rhythm. (Also read: Cigarettes, alcohol or coffee? This is what disturbs sleep the most)

Until when you should get the caffeine kick

But caffeine is not only recommended after getting up, but also before going to bed. For example, caffeine can impair sleep up to six hours after consumption, as the US broadcaster quotes a study. If you have a coffee less than six hours before going to bed, you can lose an hour of valuable sleep. So if you want to go to bed at nine o'clock, you shouldn't have coffee after three o'clock in the afternoon - some scientists even generally advise you to forego the popular bean drink completely after two in the afternoon. If you still need your caffeine kick, you should opt for green tea, which has significantly less caffeine. (Also Read: Scientists Warn: Are We Imminent A Coffee Crisis?)