In recent years, Energy drinks have become part of everyday life Many teenagers and adults drink them to study, party, play video games late, or perform better at the gym. They seem harmless, almost like any other soft drink, but what happens inside the body after opening one of these cans is much more complex than it appears.
Although they are sometimes sold as if they were an innocent performance aid, the reality is that They contain very high doses of caffeine, sugar, and other stimulants. These drugs can disrupt the cardiovascular system, the brain, metabolism, and even sleep, especially in young people or those with pre-existing health conditions. Let's take a closer look at what they contain, how they work minute by minute, and why health authorities are so concerned.
What are energy drinks really and what do they contain?
When we talk about energy drinks, we are referring to products non-alcoholic, usually carbonated, very sweet and full of stimulants such as caffeine, taurine, guarana or ginseng, sometimes combined with B vitamins, minerals and various additives (colorings, preservatives, flavorings).
Unlike a regular soft drink, these beverages are marketed as something that It increases physical and mental performance, improves concentration, and reduces fatigue.This image is reinforced by marketing in sports, concerts, or social media, and it tends to particularly appeal to the youth population.
One of the most worrying aspects is that Its consumption has skyrocketed among teenagersAlmost half of boys and girls aged 14 to 18 admit to having taken them in the last month, and their use is already very common in contexts of nightlife, study or even mixed with alcohol.
In addition to their stimulating power, these drinks have another key characteristic: They provide a real "buzz" of sugar or, failing that, large quantities of sweetenerswhich can have medium and long-term consequences on weight, glucose metabolism and cardiovascular health.
The label is your best clue to what you're taking.European regulations require that the caffeine content (in mg/100 ml) be clearly indicated and that the warning "High caffeine content: not recommended for children or pregnant or breastfeeding women" be included.
Main ingredients and how they act in the body
The “magic” (and the problem) with these drinks lies in the combination of their ingredients. Each one has its own effect, and together they create a cocktail that It triggers the nervous and cardiovascular systems in a very short time.
Caffeine: the engine of the energy boost
Caffeine is the star ingredient: Most of the stimulating effects come from itIn most of these drinks, the concentration is around 32 mg per 100 ml, which means that a 250-330 ml can easily contain the equivalent of two to four espresso coffees.
Caffeine works by blocking adenosine, a brain chemical that helps us relax and fall asleep. By blocking it, a increased neurotransmitters such as dopamine and norepinephrine, which make us feel more awake, active and alert.
However, that same action causes increase heart rate and blood pressureThis is especially dangerous if certain consumption thresholds are exceeded (from about 3 mg of caffeine per kilogram of weight, notable neurological and cardiovascular effects can appear).
In sensitive individuals, those with heart disease, anxiety disorders, or sleep disturbances, Even small amounts can trigger palpitations, intense nervousness, or insomnia.Therefore, the risk is not the same for everyone.
Taurine and other stimulants: a far from innocent cocktail
In addition to caffeine, these drinks often contain taurine, an amino acid that It participates in cellular functions related to energy use and muscle contraction.It is believed to enhance physical and mental performance, although long-term evidence in adolescents is limited.
Many products also contain added extracts such as guarana, ginseng or ginkgo bilobaGuarana, in fact, is another source of caffeine, so the total stimulant load may be even higher than what the consumer perceives by only reading the word "caffeine" on the label.
The problem is that, by combining several stimulating compounds in developing organisms (like those of adolescents), the medium and long-term effects are not fully known, and each person may react differently depending on their genetics and health status.
Sugar by the spoonful… or sweeteners galore
In its sweetened version, a single can can provide the equivalent of more than 10 teaspoons of white sugarWe are talking about between 27,5 and 30 grams per 250 ml, and up to 55-60 grams per 500 ml can, figures that far exceed the WHO's daily recommendations with just one drink.
This excess of sugar causes a rapid rise in blood glucose This forces the pancreas to release large amounts of insulin. After this peak comes the typical sharp drop (the "sugar crash"), which results in tiredness, apathy, sudden hunger, and a desire to consume something sweet or caffeinated.
The "sugar-free" versions use sweeteners such as aspartame and others, which do not provide calories but They are not without controversyThey are associated with a higher risk of type 2 diabetes, cardiovascular disease, and possible alterations in the gut microbiota when consumed regularly and in the long term.
B vitamins: the healthy touch that confuses
Many brands prominently highlight that their products are enriched with B vitamins, necessary for energy metabolismIt is true that these vitamins help transform food into usable energy, but they are not usually lacking in a minimally balanced diet.
The problem is that, by focusing on vitamins, consumers are given the impression that these are "functional" or even healthy drinks, when what makes the real difference in the body are... caffeine, sugar, and other stimulantsnot those small extra doses of vitamins.
What happens to your body after drinking an energy drink
One of the clearest ways to understand the effect of these drinks is to observe how the body reacts from the first few minutes to several hours later of having ingested them.
First 10 minutes: caffeine enters the scene
Within minutes of taking it, caffeine begins to pass into the bloodstream. The heart races, blood pressure rises, and the feeling of activation begins.You may notice that you are more awake, with less feeling of tiredness or sleepiness.
Between 15 and 45 minutes: maximum effect
It is during this interval that peak blood caffeine concentration is reached And most people notice the maximum "high": greater ability to concentrate, a feeling of having more energy, increased alertness and, in some cases, a certain mild euphoria.
After 50 minutes: the descent begins
Around the time of consumption, the liver begins to work at full capacity to handle the excess sugar and metabolize the caffeine. Glucose levels, which had plummeted, are beginning to fall And then the famous "sugar crash" appears, with feelings of fatigue, lack of energy and, sometimes, irritability.
At 5 hours: there is still a lot of caffeine circulating
After about 5 hours half of the caffeine ingested is still in the bloodThis means that its effects on the nervous and cardiovascular systems continue, even though you no longer feel the initial rush as much.
In people with a slower caffeine metabolism (something greatly influenced by genetics), that half-life can be longer. which increases the risk of insomnia if consumed in the afternoon or evening.
Between 12 and 24 hours: signs of withdrawal
If you are a regular consumer, after half a day or a day Caffeine withdrawal symptoms may appear: headache, irritability, difficulty concentrating, even constipation or a general feeling of lack of energy.
This high-low-withdrawal cycle can cause becomes a hard habit to breakespecially among young people who routinely use them for studying or partying and feel that they "don't perform" without their can.
Health risks and side effects
Occasionally consuming an energy drink in healthy individuals usually results in a single episode of mild tachycardia or difficulty sleeping. The real problem arises when Its consumption is frequent, in large quantities, or among vulnerable people..
Impact on the cardiovascular system
High doses of caffeine and other stimulants cause a vasoconstrictor effect and a transient hardening of the arterieswhich results in increases in blood pressure and heart rate.
In predisposed individuals, this can trigger tachycardia, arrhythmias, hypertensive crises, and even more serious episodesExtreme cases have been described, such as that of a 21-year-old who developed cardiomyopathy after consuming four 500ml cans daily for a prolonged period.
Furthermore, health authorities and scientific societies insist that, in children and adolescents, whose cardiovascular system is still developing, This type of stimulant "bomb" is a kind of Russian roulette.Those with a hidden predisposition to heart problems may experience them precisely as a result of these drinks.
Effects on the brain, sleep, and mood
The hyperexcitability that caffeine produces in the brain can translate into nervousness, anxiety, irritability, and difficulty concentratingespecially as the maximum effect fades away.
As for sleep, energy drinks are declared enemies of quality rest. They interfere with falling asleep and alter its depthThis, if it persists over time, can trigger chronic insomnia, daytime sleepiness, and a constant feeling of tiredness.
When caffeine intake exceeds 300 mg per day (something that can happen with two large cans), the risk of anxiety syndrome, headaches, depressive symptoms, and withdrawal syndromeThis can lead to a vicious cycle: the person drinks energy drinks because they are tired, and at the same time, they are tired because of them.
Metabolic, digestive and bone consequences
Due to their sugar or sweetener content, and their caffeine content, these drinks have been linked to increased risk of overweight and obesity, impaired glucose tolerance, and, in the long term, type 2 diabetes.
They can also produce Gastrointestinal disorders such as nausea, abdominal pain or diarrhea, and in very high consumption, alterations in the intestinal microbiota have been described, as well as damage at the renal and hepatic level, especially when combined with other risk factors.
Some studies also point to a possible bone loss and increased risk of osteoporosis in chronic consumers of high doses of caffeine, especially if the diet is poor in calcium and vitamin D.
Addiction, dependence, and drug interactions
The combination of caffeine, sugar, and social reinforcement (they are associated with leisure, sports, parties, etc.) makes it It's not uncommon to develop a certain dependence.When trying to reduce consumption, typical withdrawal symptoms appear: headache, apathy, bad mood, lack of concentration.
On the other hand, energy drinks can interacts with many medications and supplements, enhancing its effects or hindering its action, something especially relevant in treatments for blood pressure, heart problems, neurological or psychiatric disorders.
Why they shouldn't be mixed with alcohol, drugs, or intense exercise
One of the most dangerous and, at the same time, most widespread uses is mixing energy drinks with alcohol, a very popular combination in nightlife settings among young people.
Caffeine partially masks the feeling of intoxication: The person feels more awake, but is still just as drunk.The result is that people tend to drink more alcohol than they would without the energy drink, increasing the risk of alcohol poisoning, risky behavior, accidents, and falls.
At the liver level, this mixture subjects the body to considerable stress: Alcohol, sugar, and caffeine force the liver to work overtime.which in the long term can increase the risk of liver damage in vulnerable people.
If they are also combined with drugs like cocaine or cannabis, the cocktail is even more dangerous: the risk of serious cardiovascular events skyrockets, intense anxiety attacks, arrhythmias and other conditions that frequently end up in emergency services.
Another very common mistake is Use these drinks to "hydrate" or recover after physical exerciseTheir high caffeine content has a diuretic effect, and their high sugar concentration can contribute to dehydration and they don't adequately replenish lost minerals. For rehydration after exercise, water is the best option, or, for prolonged and intense exercise, specifically designed isotonic, not energy, drinks.
Which population groups should avoid energy drinks?
Due to the combination of its ingredients and the effects described, multiple organizations (European and national) and scientific societies agree that There are groups for whom these drinks are especially discouraged..
- Children and adolescents: due to the impact on brain and physical development, the risk of cardiovascular disorders, sleep disorders, and the ease of creating problematic consumption habits.
- Pregnant or breastfeeding women: Caffeine crosses the placenta and passes into breast milk, potentially affecting the fetus or baby (tachycardia, irritability, sleep disturbances).
- People with hypertension or heart problems: The increased blood pressure and the possibility of arrhythmias mean that the risk far outweighs any benefit.
- People with sleep disorders, anxiety, or neurological conditions sensitive to caffeine: Stimulants can significantly worsen symptoms.
Even in healthy adults, It is not recommended to exceed 500 ml per day And, in any case, it is emphasized that its consumption should be occasional, not daily or repeated throughout the day.
Why do authorities want to regulate them like alcohol?
In several territories, steps are already being taken to Restrict the sale of energy drinks to minors under 18 years of ageequating them, in a way, to alcohol within the laws of addiction prevention.
Experts in toxicology, emergency medicine, epidemiology, and nutrition agree that We cannot treat them like just another soft drink.Their caffeine, sugar and other stimulant content, along with the context in which they are consumed (nightlife, parties, extreme sports), makes them a growing public health problem.
Although there are already clear regulations on their labeling (they must warn of the high caffeine content and that they are not recommended for minors or pregnant women), the real impact of these warnings is limited. just like with the messages on cigarette packs.
That's why many specialists are calling for going further: limit their access in educational and sports centers, restrict advertising aimed at minors, and strengthen health education.making it clear that we are talking about stimulant drinks, not "healthy energy".
Safer alternatives for obtaining energy
The good news is that There's no need to resort to these drinks to feel energizedThe foundation lies in lifestyle habits that, although they may sound cliché, really work.
The most effective “combo” is quite simple: balanced diet, adequate hydration, good night's sleep, and regular physical activity.When these four legs are limping, it's much easier to fall into the temptation of seeking quick fixes in the form of cans full of caffeine and sugar.
If you notice a drop in energy at certain times of the day, a more reasonable option might be to resort to natural drinks with less caffeine, such as green teawhich provides a mild stimulating effect accompanied by antioxidants and other beneficial compounds, as long as it is consumed in moderation.
In any case, if you are already a regular consumer of energy drinks and have noticed side effects (palpitations, insomnia, nervousness, digestive discomfort…), It's worth discussing with a healthcare professional. to adjust consumption, assess your specific situation and, if necessary, seek support to reduce or quit this habit.
The image of energy drinks as performance allies contrasts with the reality of their effects: A potent mix of caffeine, sugar, and other stimulants that alters the heart, brain, sleep, and metabolismwith a particularly worrying impact on children and adolescents. Understanding what happens in the body after each can and who should avoid them completely is key to making more conscious choices, prioritizing water and an active lifestyle, and reserving these products, at the very least, for very occasional and carefully measured use.
