10 common sports nutrition myths that could be hurting your performance

Sports nutrition can be confusing. Between social media advice, gym culture, supplement marketing and well-meaning coaches, athletes are surrounded by claims about what they should eat, avoid or supplement. The problem is that some of these claims sound convincing but can actually undermine training, recovery and performance.

Recent research reinforces the importance of evidence-based nutrition education. A scoping review found persistent gaps between athletes’ nutrition knowledge and recommended dietary practices, while another study found adolescent athletes scored below 50% on both general and sport-specific nutrition knowledge. 

Here are 10 common myths worth leaving behind.

Myth 1: Carbs Are Bad for Athletes

Carbohydrates are often blamed for weight gain, but they are an important fuel source for high-intensity and endurance exercise. Cutting them unnecessarily can leave athletes with inadequate glycogen stores and less energy for demanding training.

The right carbohydrate intake depends on the sport, training load and individual goals. Rather than eliminating carbs, athletes should focus on matching carbohydrate availability to the work required.

Myth 2: More Protein Always Means More Muscle

Protein is essential for muscle repair and adaptation, but consuming more is not automatically better. Once an athlete's protein needs are adequately covered, simply adding more protein does not guarantee additional muscle or improved performance.

The bigger priority is a consistently adequate diet, with protein distributed sensibly throughout the day and combined with appropriate training.

Myth 3: You Need Supplements to Perform at Your Best

Supplements can have a role in sports nutrition, but they are not a substitute for a strong dietary foundation. Many athletes spend money on products that promise dramatic improvements when their basic nutrition, sleep or training may need more attention.

A study of high school athletes found that targeted education improved their knowledge of third-party-tested supplements and banned substances. 

This highlights an important point: knowing whether a supplement is appropriate and safe can matter more than simply taking one.

Myth 4: Sports Drinks Are Always Better Than Water

Sports drinks can be useful during prolonged or intense exercise because they can provide carbohydrate and electrolytes. However, they are not automatically necessary for every workout.

For a short, low-intensity session, water may be perfectly adequate. Hydration should reflect exercise duration, intensity, environmental conditions and individual sweat losses rather than a blanket rule.

Myth 5: Training Fasted Is the Secret to Better Performance

Fasted training has become popular in some fitness circles, particularly among people interested in fat loss or metabolic adaptations. But it is not a universal performance strategy.

Nutrition needs to match the purpose of the session. For demanding training, having adequate fuel available can support performance and training quality, while lower-fuel strategies may have a specific place under professional guidance.

Myth 6: You Must Eat Every Two Hours

There is no universal requirement for athletes to eat every two hours. Meal frequency should fit an individual's energy requirements, schedule, training sessions, preferences and ability to recover.

What matters more is total energy and nutrient intake over the day. Obsessing over an arbitrary eating schedule can make nutrition unnecessarily complicated.

Myth 7: Losing Weight Will Automatically Make You Faster

This is particularly dangerous for athletes in endurance and weight-sensitive sports. Being lighter does not automatically mean being faster, stronger or healthier.

Research involving elite athletes in weight-class sports found that nutrition knowledge was associated with weight-loss strategies and that coaches' nutrition knowledge was related to athletes' knowledge and dietary practices.

Performance should be the goal, not simply achieving the lowest possible body weight.

Myth 8: Natural Supplements Are Always Safe

"Natural" does not mean risk-free, effective or suitable for athletes. Supplements can contain active ingredients, interact with medications and, in some cases, contain substances that create anti-doping concerns.

This is one area where expert guidance is especially valuable. Athletes subject to anti-doping rules should consider products that have undergone appropriate third-party testing rather than relying on marketing claims alone.

Myth 9: Nutrition Advice From Social Media Is Reliable

A confident influencer can make poor advice sound scientific. Unfortunately, popularity, impressive physiques and personal success stories are not substitutes for research or professional qualifications.

Professor Asker Jeukendrup, a sports nutrition scientist and exercise physiologist who has advised elite sporting organisations and teams, has warned that there is "a lot of information out there" that is not based on evidence.

His warning is particularly relevant when evaluating viral nutrition claims.

Research also shows that education can make a difference. A randomized controlled trial found that a 16-week nutrition education program significantly improved sports nutrition knowledge among track and field athletes. 

Myth 10: There Is One Perfect Athlete Diet

There is no single meal plan that works for every athlete. A marathon runner, powerlifter, swimmer and footballer have different physiological demands, training schedules and competition requirements.

Professor Louise Burke, an internationally recognised sports dietitian and researcher who has worked with Australian Olympic teams across multiple Olympic Games, puts the complexity of sports nutrition into perspective: "Navigating the path from molecules to medals is challenging, requiring an array of research skill sets and knowledge." 

A study of adolescent athletes similarly demonstrated why individualised education matters, finding substantial gaps in knowledge around food, hydration and supplements. 

Fuel Smarter, Not Harder

The biggest sports nutrition myth may be that there is always a secret food, supplement or diet capable of transforming performance. In reality, successful sports nutrition is usually much less glamorous: adequate energy, appropriate carbohydrates and protein, sensible hydration, sufficient micronutrients and nutrition timed around training and competition.

The evidence also suggests that better knowledge can be developed. A scoping review identified substantial gaps in athletes' nutritional knowledge, while the education studies above demonstrate that structured nutrition education can improve understanding. 

That is why athletes should be cautious about advice that promises quick results or applies the same rule to everyone. When in doubt, a qualified sports dietitian can help translate evidence into a practical plan suited to the individual.

Beyond the Myths: What Your Performance Really Needs

Good sports nutrition is not about following the loudest trend. It is about understanding what your body needs for the training you actually do, then adjusting that strategy as your workload and goals change.

Whether you are searching for sports nutrition, researching sports nutrition myths, wondering about protein, considering creatine, or comparing protein powder, the same principle applies: look beyond the headline and ask what the evidence actually says.

Your best performance is unlikely to come from following the most extreme nutrition rule. It is much more likely to come from consistently fuelling, recovering and training in a way that is appropriate for you.