How to tell that you are drinking too much coffee
The morning cup of coffee is almost a sacred ritual for most of us. That characteristic aroma drifting through the kitchen, the first sip that seems to kick-start the entire day – these are moments that millions of people around the world cannot imagine without their favourite drink. Coffee is the second most traded commodity in the world, right after oil, and its consumption grows year after year. But what happens when one cup becomes two, two becomes four, and suddenly a person doesn't even notice how coffee has become an indispensable part of every hour of the day? This is precisely the moment when the body begins sending signals that are definitely worth paying attention to.
Caffeine is a psychoactive substance that acts on the central nervous system – it blocks adenosine receptors, a natural neurotransmitter that induces feelings of sleepiness. The result is a short-term sense of alertness, improved concentration and increased energy. This is exactly why coffee is so addictive and why it is so difficult to admit that we may be drinking too much of it. The World Health Organisation and the majority of nutrition experts agree that the safe daily dose of caffeine for a healthy adult is approximately 400 milligrams, which corresponds to roughly three to four standard cups of filtered coffee. But where exactly does the line lie between reasonable consumption and excessive dependence?
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Signals sent by an overloaded body
One of the first and most common symptoms of excessive caffeine intake is heart palpitations or an irregular heartbeat. Many people are familiar with this feeling – suddenly sensing that their heart seems to skip a beat or is beating faster than it should. Caffeine stimulates the release of adrenaline, the stress response hormone, and at higher doses can cause tachycardia, meaning an accelerated heart rate. If someone notices that this unpleasant sensation regularly follows each additional cup, it is a clear message from the body that it is receiving more than it can handle.
Another signal that people often mistakenly attribute to stress or overwork is chronic anxiety and nervousness. Studies published in the specialist journal Journal of Psychopharmacology have repeatedly confirmed that excessive caffeine intake demonstrably intensifies symptoms of anxiety disorders and can even trigger panic attacks in people who are predisposed to them. This is neither coincidence nor weakness – it is a purely biochemical reaction of the organism to a substance it is receiving in greater quantities than it can metabolise. If a person feels permanently "wired", inexplicably nervous, or has the sense that their thoughts are constantly racing, it is worth reflecting on how many cups of coffee they actually drink each day.
A very telling signal is also disrupted sleep. Caffeine has a half-life of approximately five to six hours, meaning that a cup of coffee drunk at four in the afternoon can still be affecting the quality of sleep even at midnight. People who drink coffee in larger quantities or consume it too late in the afternoon often complain of difficulty falling asleep, frequent waking in the middle of the night, or the feeling that they wake up in the morning just as tired as when they went to bed. They then reach for another cup to overcome the fatigue – and the cycle closes. This vicious circle was described precisely by writer and neurologist Matthew Walker in his book Why We Sleep: "Caffeine does not cure us of fatigue, it merely masks it – and for that mask we pay with a sleep debt that must one day be repaid."
The body speaks – you just need to listen
Few people associate headaches with excessive coffee consumption – paradoxically, however, headaches can signal both too little caffeine (in the case of withdrawal syndrome) and an excess of it. At high doses, caffeine causes vasoconstriction, meaning the narrowing of blood vessels, and once its level in the blood drops, the vessels rapidly dilate, which can trigger intense pain. People who have become accustomed to drinking large amounts of coffee every day therefore sometimes complain of throbbing headaches without suspecting that the cause lies in their favourite drink.
Take the example of Lucie, a thirty-year-old marketing manager who works from home and admits to drinking five to six cups of coffee a day. At first she noticed nothing unusual – she felt productive, focused, full of energy. Over time, however, she began to suffer from chronic stomach pain, her sleep deteriorated to the point where she was waking every night at two in the morning, and during the day she was overcome by waves of anxiety that seemed to come from no particular cause. Only when she reduced her coffee intake to two cups a day on her doctor's recommendation did she understand how significantly this drink had been affecting the overall functioning of her body and mind.
Lucie's story is not unique. Digestive problems are among the very common accompanying symptoms of excessive coffee consumption. Coffee is naturally acidic and stimulates the production of stomach acid, which can lead to heartburn, reflux or painful stomach cramps. Some studies suggest that caffeine itself relaxes the lower oesophageal sphincter, allowing stomach acids to flow back into the oesophagus. If someone therefore feels uncomfortable after every cup or notices they are troubled by recurring heartburn, their body is telling them quite clearly that it is time to reconsider their relationship with coffee.
Among the less discussed but equally important symptoms are frequent urges to use the toilet and dehydration. Caffeine acts as a mild diuretic – it promotes the excretion of urine, and if a person does not drink enough water, they can develop mild chronic dehydration, which manifests as headaches, dry mouth, fatigue and reduced concentration. The irony is that people often address precisely these symptoms of dehydration with another cup of coffee, thereby only deepening the problem.
Trembling hands and muscle twitches also deserve attention. At higher doses of caffeine, the nervous system can react with excessive stimulation, manifesting as a fine tremor, an inability to keep the hands still, or unpleasant muscle twitches – particularly in the eyelids. This symptom is often clearly visible and for many people represents the first truly visible signal that their body is calling for a break.
There is yet another aspect of excessive coffee consumption that is rarely discussed, and that is emotional instability. Caffeine affects dopamine and serotonin levels in the brain, and with prolonged high intake can cause mood swings – a person alternately feels euphorically productive and then suddenly exhausted, irritable or even depressed. This emotional rollercoaster can have a direct impact on work performance, interpersonal relationships and overall wellbeing.
It is worth noting that sensitivity to caffeine is a highly individual matter and depends on genetic factors. Some people are so-called fast metabolisers of caffeine – their bodies break it down quickly and efficiently, meaning they can drink four cups a day without significant symptoms. Others, slow metabolisers, may have pronounced reactions even after a single cup. Genetics play a role, but this does not mean that every fast metaboliser should consume coffee without restraint – even in such cases, excessive quantities can gradually cause the difficulties described above.
What to do about it?
If a person recognises themselves in any of the symptoms described, they do not need to immediately reach for a radical solution and eliminate coffee from their life entirely. Abrupt withdrawal from caffeine after a prolonged period of high consumption can itself cause withdrawal symptoms – headaches, fatigue, irritability or a feeling of mental fog, which can last several days. Experts therefore recommend a gradual reduction in dosage, ideally by one cup per day each week, until consumption reaches a reasonable level.
A practical step may also be switching to beverages with lower caffeine content – for example green tea, which does contain caffeine but in smaller amounts and in combination with the amino acid L-theanine, which moderates its stimulating effects and contributes to a calmer, more focused energy without nervousness. For those who wish to preserve the morning ritual without caffeine, there is today a wide range of quality alternatives – from chicory to adaptogenic drinks and herbal blends that can credibly imitate coffee in both taste and aroma.
The key is not to give up coffee as such – for most healthy adults, moderate consumption is perfectly fine and research even suggests certain health benefits. It is more a matter of learning to listen to one's own body. When fatigue, irritability or anxiety arise, the first question should not be "where is the nearest café?" but rather "how much have I had today and what do I actually need?" The body generally knows what it needs – you just need to start listening to it.
