Energy Drinks and Teenagers: What Parents Really Need to Know

A brightly coloured can, a bold logo, the promise of boosting concentration before an exam or staying awake at a party: energy drinks are everywhere in the daily lives of 12- to 18-year-olds. Yet behind their appealing marketing lies a composition that deserves a careful look — especially if you're a parent.

What's Really Inside a Can

The term "energy drink" is not an official regulatory category: it's a commercial label. These drinks are soft drinks enriched with stimulant substances, not products that provide energy in any nutritional sense. ANSES actually prefers to call them "so-called energy drinks" (BDE in French) to underline this distinction.

Their typical composition includes several families of ingredients:

• Caffeine: the main active ingredient, at doses well above those found in a standard soft drink.
• Taurine and glucuronolactone: two compounds present in significant quantities, whose safety in this consumption context has not been fully demonstrated according to ANSES.
• Sugars: in large amounts in the majority of non-sugar-free formulas.
• Plant extracts: guarana (another source of caffeine), ginseng, and sometimes other stimulant substances.
• B vitamins and various flavourings.

It is important to note that guarana is itself a source of caffeine: the actual caffeine content in a drink may therefore exceed what is stated on the label if only the "added" caffeine is taken into account.

Caffeine and Sugar Levels Not to Be Underestimated

Caffeine: up to 80 mg and more in a single can

A standard 250 ml can of energy drink contains on average around 80 mg of caffeine — up to two to three times more than a standard cola can (around 30 mg). For a 500 ml can, this can represent the equivalent of several espressos at once.

For a healthy adult, the commonly accepted limit is 400 mg of caffeine per day (EFSA, ANSES, FDA). But for children and adolescents, EFSA recommends not exceeding 3 mg of caffeine per kilogram of body weight per day. In practice, for a 40 kg teenager, that means a ceiling of just 120 mg — already the content of a single standard can, or even less.

To better understand how caffeine works and how long it stays active in the body — its half-life ranges from 3 to 7 hours depending on the individual — you can explore PauseCafé's active caffeine curve, which visualises this elimination process in real time.

Sugar: a cumulative effect that's often overlooked

Energy drinks generally contain high quantities of sugar in their standard formulas. A 250 ml can can provide a significant share — or even all — of the daily added sugar quota recommended for a child or teenager, and 500 ml formats can contain twice as much.

The American Heart Association recommends that children and adolescents consume no more than 25 g of added sugar per day. A single large can can therefore exceed this threshold on its own, before even accounting for the rest of the day's food intake. This combination of sugar and caffeine produces a particularly problematic effect: a rapid energy spike followed by a sharp crash, which can leave the teenager even more tired than before.

Sugar-free versions are not necessarily a solution: they retain the high caffeine doses, and the long-term effects of sweeteners on young bodies are not yet fully documented.

Why Teenagers Are More Vulnerable Than Adults

ANSES has established this across successive opinions: children and adolescents face increased risks at equivalent caffeine quantities compared to adults. The reason is physiological: their lower body weight means that the same dose represents a far higher concentration in the body. What may seem inconsequential for a 75 kg adult is absolutely not so for a 40 to 50 kg teenager.

Added to this is the fact that the brain and central nervous system are still developing during adolescence, making these organs potentially more sensitive to the effects of stimulant substances.

The Risk Situations Parents Often Don't Realise

Combined with sport

Many teenagers consume energy drinks before or during exercise, confusing them with sports drinks. This is a significant mistake: ANSES formally advises against consuming them before, during, or after physical exercise. Caffeine can mask the signals of fatigue, and the rapid sugar load is not suited to hydration during effort. To learn more about what caffeine actually does to heart rate, our article on caffeine and resting heart rate provides a useful perspective.

Combined with alcohol

Mixing energy drinks with alcohol is a widespread practice among young adults and some teenagers. The risk is serious: caffeine reduces the subjective perception of alcohol's effects, which can lead to drinking more alcohol without sensing the usual warning signals — even though motor coordination and reaction time remain impaired.

Unnoticed cumulation with other caffeine sources

A teenager who drinks an energy drink in the morning and then has cola, iced tea, or hot chocolate during the day can easily reach a total caffeine intake well above the recommendations for their age — without even realising it. This is known as source accumulation, and it's worth keeping in mind when reviewing everything your teenager consumes throughout the day.

What Official Recommendations Say

The position of French health authorities is clear and consistent:

• ANSES recommends completely avoiding energy drink consumption in children and adolescents, as well as in pregnant and breastfeeding women and people sensitive to caffeine.
• The French Ministry of Health considers these drinks to be for adults only.
• EFSA sets a limit for children and adolescents of 3 mg of caffeine per kilogram of body weight per day, across all sources combined.
• In France, sales to minors are not prohibited by law: only recommendations and mandatory labelling requirements exist. Labels must state "high caffeine content, not recommended for children or pregnant or breastfeeding women" for drinks containing more than 150 mg/l of caffeine.

For comparison, in some European markets, legal restrictions on sales to minors have already been introduced — an option France has not yet adopted to date.

Practical Guidance for Parents

Here are the concrete points to keep in mind when approaching the subject calmly with your child:

1. Read the label together. Look for the caffeine content (in mg) and sugar content (in g per 100 ml). Calculate the total for the amount actually consumed.
2. Don't confuse energy drinks with sports drinks. Isotonic sports drinks without caffeine are designed for hydration during exercise; energy drinks are not.
3. Talk about cumulation. Explain that the caffeine in a can adds to whatever is already in the cola, tea, or iced coffee consumed earlier in the day.
4. Have the conversation without blame. Understanding why these drinks are appealing — the taste, the marketing, social pressure — helps you suggest realistic alternatives.
5. Identify the high-risk moments. Late-night studying before an exam, parties, sport sessions: these are the situations where consumption most often happens, and where the risks are highest.

If your teenager is using an app to track their caffeine intake — a habit increasingly common among health-aware students — PauseCafé's active caffeine curve lets them see exactly how much caffeine is still active in their body and when it will be fully cleared.

In Summary

So-called energy drinks are not simply slightly stronger soft drinks. Their composition — high-dose caffeine, large quantities of sugar, taurine, and other stimulant substances — places them in a category of their own, for which French and European health authorities recommend particular vigilance when it comes to young people. This is not a moral judgement, but a physiological one: a growing body responds differently to these substances than an adult one does. Knowledge, shared calmly within the family, remains the best protection.

Stop guessing. Start measuring.

PauseCafé records the real caffeine content of every drink, so your daily total actually means something. Free, no adverts.