Truth:Sports drinks are primarily composed of water, sugar (such as glucose and oligosaccharides), and electrolytes like sodium and potassium ions. Their purpose is to replenish the fluids, electrolytes, and energy substances lost by athletes during competitions and training. Their primary function is tailored for athletes engaged in intense, high-load exercise. For the average person, sports drinks are not a healthy everyday beverage — on the contrary, they may lead to a range of health issues.
No Fluid Replacement During Exercise = Dehydration?
In fact, in the 1970s, marathon runners refused to drink during races, fearing it would affect their performance. It wasn’t until companies began sponsoring scientists to conduct research on fluid replacement that its importance gained widespread attention. Now, these scientists, by influencing sports medicine institutions, spread fear among athletes and the general public — the danger of dehydration.
The biggest achievement of the sports drink industry has been successfully undermining people’s trust in “thirst.” Thirst has long been considered a highly sophisticated homeostatic mechanism for detecting and responding to dehydration. However, studies sponsored by sports drink companies have pointed out that this mechanism is inaccurate and unreliable, and relying on thirst might prevent people from fully replenishing lost fluids. Therefore, “(athletes) should consume 150 milliliters of fluid every 15 minutes, even if they’re not thirsty.” Even the International Olympic Committee’s nutrition guide for athletes (published in 2003, updated in 2008) emphasizes the importance of hydration and preventing dehydration, yet never once mentions “thirst.”
Professor Tim Noakes, a sports and exercise science expert at the University of Cape Town, said, “Dehydration is a normal physiological response to exercise. As fluid loss increases, you get thirsty, you drink, and then it’s over. The problem is, companies want to boost sales, so they can only claim that the thirst mechanism is ‘inadequate.’” Professor Noakes is particularly qualified to speak on this — in the early 1980s, he helped develop a sports drink with a South American sports beverage company.
Moreover, modern competitive sports events already provide athletes with very convenient services, including readily available water. Take marathons, for example — there are water stations along the route where athletes can stop and hydrate as needed. They’re not running through a desert suffering from a complete lack of water.
Do Sports Drinks Help You Maintain Peak Performance?
For athletes, significant fluid loss can indeed impact health and performance, but whether sports drinks truly replenish fluids and electrolytes better than other options, as claimed by sports drink companies, is now debated.
A meta-analysis study from the Centre for Evidence-Based Medicine at Oxford University pointed out: Looking at current research articles on sports drinks improving athletic performance, there is a lack of high-quality studies, and the research suffers from significant bias. Only three articles could be included in the analysis. Drawing conclusions based solely on existing research is very concerning. To be convincing, higher-quality studies are needed.
Some scholars argue that athletes’ daily nutritional intake from three meals is sufficient to replenish electrolytes and energy lost during training and competition. From this perspective, using sports drinks to replenish energy or electrolytes after training or competition is not necessary. As for energy replenishment between events or training sessions, consuming moderate amounts of solid energy bars, candy, bananas, etc., can also achieve the same goal — sports drinks offer no outstanding advantage.
Regarding the most crucial issue of hydration, sports drinks also don’t appear to be more effective than plain water. In modern sports, due to rule changes, athletes have ample time to rehydrate. Therefore, what can truly harm athletes’ health in practice is hyponatremia caused by excessive water intake, or heat-related illnesses triggered by high temperatures — not a lack of sports drinks.
Studies have found that the occurrence of hyponatremia is unrelated to the type of fluid consumed, but only to the amount. In other words, drinking too much sports drink can also cause hyponatremia. It is currently believed that fluid intake should follow the body’s needs — when you feel thirsty, drink appropriately (you can also drink a sports drink), and that’s enough. As for heat illness during exercise, core body temperature rise is more affected by external environmental factors (temperature, humidity, wind speed, etc.) than by the type of fluid consumed.
Do Sports Drinks Make You Healthier?
After successfully convincing athletes that what they drink during exercise is as important as their regular training, the sports drink industry expanded its target audience. They launched ads on mass media and promoted the importance of fluid replacement and the inadequacy of bottled water through sports medicine education in schools, to parents and students.
Their strategy has been very effective. Non-athletes are now the largest consumer group of sports drinks. Many people who don’t exercise much view drinking sports drinks as a healthy lifestyle. An analysis from the Yale Rudd Center for Food Policy & Obesity revealed that one in four American parents believe sports drinks are healthy for their children.
But all the studies provided by sports drink companies focus on individuals who maintain intensive, high-intensity exercise habits. They seem to have overlooked the fact that the vast majority of their consumers are people who only go to the gym for about two hours per week on average. This is why the European Food Safety Authority (EFSA) states that carbohydrate-electrolyte beverages (i.e., sports drinks) are only suitable for those who engage regularly in high-intensity endurance activities.
Researchers at Harvard University point out that a 500-milliliter bottle of sweetened beverage typically contains 3–14 teaspoons of sugar (one teaspoon is about 4 grams of sugar). Consuming more sugar means taking in more energy, which, if not controlled otherwise, will inevitably contribute to obesity, diabetes, tooth decay, gout, and other health problems. The aforementioned Yale analysis confirmed that increased consumption of sports drinks by children significantly contributes to their obesity.
Secondly, the sodium electrolytes in sports drinks can also pose some health risks. According to our national standards, the sodium content in sports drinks generally ranges from 50–1200 milligrams per liter. Drinking sports drinks regularly will inevitably increase sodium intake. Excessive sodium raises the risk of hypertension, stroke, cardiovascular disease, gastric cancer, osteoporosis, and other conditions.
Clearly, sports drinks should not be consumed in large quantities as a health drink.
Objectively Assessing the Scientific Evidence Backing Sports Drinks
When marketing their products, sports drink companies invariably emphasize the scientific evidence behind them. But a systematic review of sports drinks by the British Medical Journal found that related studies commonly have the following issues: insufficient sample size, low study quality, data manipulation (prioritizing positive results), and lack of double-blind trials. Meanwhile, in the position statement on fluid replacement published by the American College of Sports Medicine, most committee members disclosed in the conflict-of-interest statements at the end of the article that they had collaborated with or received funding from certain sports drink companies.
Additionally, because relevant institutions and prestigious journals have established long-term partnerships with major sports drink companies, studies reporting negative findings about sports drinks are rarely published.
Conclusion: For those who maintain a habit of intense, high-load exercise, as long as they drink an appropriate amount of water when thirsty and avoid large single-time fluid intake, whatever they drink can help prevent dehydration, hyponatremia, and water intoxication. In terms of energy replenishment, items like chocolate and bananas are also comparable to sports drinks. Therefore, choosing to drink sports drinks is simply a matter of personal preference. For amateur athletes or those who never exercise, sports drinks are definitely not a necessity for a healthy lifestyle.