Caffeine – how does it affect us?

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Louise Barnett
Louise Barnett
I'm Louise Barnett, the editor at, where my days are filled with the exploration of myriad subjects that pique my curiosity and feed my ever-growing appetite for knowledge. From the latest in laser cutting technology to the timeless wisdom of yoga and meditation, my work allows me to dive deep into topics that not only fascinate me but also have the potential to improve our daily lives. I have a particular interest in how ancient practices meet modern life, leading me to explore everything from Ayurveda to minimalism and beyond. My journey has taught me the importance of balance—between innovation and tradition, action and reflection, and between the digital and the natural world. Each article I publish is a step towards understanding this balance better, hoping to inspire others along the way.

Is caffeine good or bad for us? How does it affect our bodies and should we limit its consumption? The answers to these questions can be surprising.


Caffeine is a substance that has been controversial for centuries. On the one hand, it is valued for its stimulating effects, while on the other, it has been criticized for its potential negative health effects. In this article, we will take a closer look at this chemical compound, which is present in many of the foods and beverages we consume every day.

What exactly is caffeine?

Caffeine is a natural purine alkaloid that is found in more than 60 species of plants, including coffee beans, tea leaves, and cocoa beans. In its pure state, it is a white, bitter powder. The name of caffeine changes depending on the source from which it comes – when we obtain it from tea, it is called theine, when from guarana – guaranine, and if we reach for yerba mate, then we speak of matein.

Caffeine – properties

Caffeine is primarily known for its stimulating effect. It acts on the central nervous system, increasing alertness and concentration, as well as improving mood. Caffeine affects the release of dopamine, the so-called happiness hormone, which explains why we often feel better after a cup of coffee.

Caffeine also has antioxidant properties, meaning that it helps protect our cells from free radical damage. In addition, studies have shown that caffeine can lower histamine levels in the body, which is beneficial for allergy sufferers.

Contraindications - Caffeine
Contraindications – Caffeine. Photo:

Contraindications – Caffeine

Despite its many benefits, caffeine consumption is not recommended for everyone. People with certain medical conditions, such as heart disease, high blood pressure, stomach disease or sleep disorders, should limit their caffeine intake or abstain from it altogether.

Caffeine can also affect the absorption of some minerals and vitamins, such as calcium and iron. Therefore, people who consume a lot of coffee or other caffeinated beverages should pay special attention to a balanced diet.

Pregnant and breastfeeding women should also limit their intake of caffeine, as it can cross the placenta into the baby’s body, as well as into breast milk. Children and adolescents should avoid consuming caffeine, especially in the form of energy drinks, which often contain much more caffeine than coffee or tea.

People who regularly consume a lot of caffeine may also experience withdrawal symptoms such as headaches, fatigue, irritability and depression if they suddenly stop consuming it.

Finally, some medications and dietary supplements can interact with caffeine, altering their effectiveness or causing unwanted side effects. If you regularly consume caffeine and take any medications, you should consult your doctor or pharmacist.

Caffeine – Nootropic

Caffeine is one of the world’s most popular stimulants, which stimulates countless people every day. It is the main active ingredient in coffee, but is also available as a dietary supplement. Caffeine works in a number of ways, but its main mechanism of action is through its effect on adenosine receptors, a substance with inhibitory properties on the nervous system. Caffeine has a structure similar to adenosine, which allows it to bind to its receptors, but unlike adenosine, caffeine does not inhibit the nervous system, but only takes the place of adenosine on the receptors. This prevents adenosine from attaching to the occupied receptor, and we don’t feel fatigue. Caffeine also acts to increase the release of norepinephrine, which puts us in an alert mode, and also affects the dopaminergic system, which brightens the mind and adds motivation. Caffeine is therefore a good choice when we want to improve concentration on the job at hand. It induces psychostimulation, improves reaction time and mood. It is most often used in single doses of 200 mg.

Caffeine is also often combined with other substances, such as theanine, to increase its nootropic effects. Theanine is an amino acid with calming and relaxing effects, but when it is combined with caffeine, the effects of both substances are enhanced and the negative effects are reduced. Studies show that combining caffeine with theanine improves the ability to process information and reduces reaction time. This is an effective and safe stack that can improve the effects of coffee or caffeine.

In the context of nootropics, caffeine is often used to improve concentration, increase energy levels and motivation. It is a substance that can help improve work performance and is often included in dietary supplements with nootropic properties.

How does caffeine affect the body?

Caffeine works on the body by blocking the receptors for adenosine, a substance that naturally accumulates in our bodies during the day and causes feelings of fatigue. When caffeine blocks these receptors, adenosine can’t attach to them, making us feel more alert and energetic.

Caffeine also has a stimulating effect on the circulatory system, increasing blood flow to the brain, resulting in better concentration and alertness. However, the same mechanism can lead to an increase in blood pressure, which is bad for those suffering from hypertension.

In addition, caffeine stimulates gastric acid secretion, which can lead to heartburn or stomach ulcers in predisposed individuals.

Caffeine also affects the urinary system, increasing urine production. Therefore, people who consume a lot of caffeine may use the toilet more often, which is especially important to take into account for people who have bladder or kidney problems.

It is also worth noting that caffeine can affect our bodies in different ways depending on our individual tolerance to the substance. Some people can consume large amounts of caffeine without any negative effects, while others may experience unpleasant symptoms even after one cup of coffee. It all depends on our individual metabolism and genetics.

Caffeine – research

Many scientific studies confirm both positive and negative effects of caffeine consumption. For example, studies show that moderate caffeine consumption (about 2-3 cups of coffee per day) can reduce the risk of developing many diseases, such as Parkinson’s disease, type 2 diabetes, and some types of cancer.

On the other hand, excessive caffeine consumption can lead to a number of health problems, such as insomnia, heart rhythm disturbances, elevated blood pressure, and even caffeine poisoning.

Summary – Caffeine

Caffeine is a chemical compound that has many positive but also negative effects on our health. The key is moderation and awareness of your body. If you consume caffeine and feel fine, there is probably no cause for concern. However, if you notice negative effects in yourself, such as sleep problems, nervousness or elevated blood pressure, it is worth considering limiting your caffeine intake.

The above article is not medical advice. Before using any substance, read the package insert or consult your doctor or pharmacist, as any drug used improperly endangers your life or health.

Frequently asked questions

Is caffeine only in coffee?
No, caffeine is also found in other products, such as tea, energy drinks, chocolate and even some medicines and cosmetics.

Is caffeine harmful to health?
Caffeine can be harmful if consumed in excess. It can lead to health problems such as insomnia, heart rhythm disturbances, elevated blood pressure and even caffeine poisoning.

Does caffeinehelp with concentration?
Yes, caffeine has a stimulating effect on the nervous system, which can help improve concentration and alertness.

Is caffeine good for the skin?
Caffeine has antioxidant properties that can help protect the skin from free radical damage. It is also often used in anti-cellulite cosmetics, as it can help improve circulation and reduce fat accumulation.

Is caffeine a diuretic?
Yes, caffeine is adiuretic, meaning it can increase urine production. This can lead to fluid and electrolyte loss, which is especially important to take into account for physically active people.

Can caffeine cause insomnia?
Yes, one of the most common side effects of caffeine consumption, especially in large amounts or late at night, is insomnia.

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