What Should You Eat Before Exercise? A Practical Guide

EFWA KNOWLEDGE HUB · NUTRITION & WEIGHT MANAGEMENT

By Dr Mert Eray Onen, Founder & Academic Director, EFWA · ORCID 0000-0001-8510-7293

Estimated reading time: 6 minutes

For most general fitness sessions, the best pre-exercise meal is familiar, comfortable to digest and matched to the work ahead. Carbohydrate becomes more useful as a session grows longer or more demanding; a moderate serving of protein can support the wider daily diet. Timing matters, but there is no single meal or clock time that suits everyone.

“What should I eat before exercise?” sounds like a request for one perfect menu. In practice, it is a planning question. A 40-minute technique session after lunch does not create the same nutritional demand as a long cycle ride first thing in the morning. The person’s appetite, food tolerance, goals and total diet also matter.

That is why a useful answer starts with context rather than a list of “best” foods. Pre-exercise nutrition should help someone begin the session adequately fuelled, without creating unnecessary fullness or digestive discomfort.

Does everyone need to eat before a workout?

No. Someone who has eaten a normal meal within the previous few hours may not need another snack before a short or moderate session. Pre-exercise feeding appears more likely to improve performance in prolonged aerobic exercise than in shorter aerobic work. A systematic review and meta-analysis by Aird and colleagues found an advantage for prolonged exercise, but not for shorter-duration aerobic performance.

This does not mean training without a recent meal is automatically better for short sessions. It means the performance benefit is less consistent, so preference and tolerance can carry more weight. Hunger, low energy, an unusually long gap since the last meal or a demanding session may all make eating beforehand more useful.

What role does carbohydrate play before exercise?

Carbohydrate provides a readily available fuel source for moderate- to high-intensity work. Established sports-nutrition guidance therefore gives carbohydrate greater emphasis before longer or harder sessions, especially where performance matters. The amount required is not fixed: it depends on exercise duration, intensity, the person’s recent food intake and opportunities to eat during the activity.

For a recreational client completing a brief strength session, a normal mixed meal earlier in the day may be sufficient. Before a long endurance session, a carbohydrate-rich meal or snack is more likely to be relevant. Familiar options might include oats and fruit, rice with a lean protein source, toast with yoghurt, or a banana with another tolerated food. These are examples, not a compulsory menu.

Training in a fasted state can alter fuel use during that session, but greater fat oxidation during exercise should not be confused with greater long-term fat loss. Reviews have not established fasted training as a universally superior body-composition strategy.

Should the meal contain protein?

A moderate protein serving can be included, particularly when the pre-exercise meal is also one of the person’s main meals. However, daily protein intake and its distribution across the day are generally more important than treating the pre-workout window as a narrow deadline.

For someone who ate a protein-containing meal recently, adding another large serving immediately before training may offer little practical advantage and could feel uncomfortable. For someone training after a long gap between meals, a snack containing both carbohydrate and protein may be convenient. EFWA’s guide to preserving muscle during weight loss explains how protein fits alongside resistance training and recovery.

How close to exercise should you eat?

The shorter the interval, the smaller and simpler the food usually needs to be. A substantial mixed meal may be comfortable several hours before training but unpleasant shortly before repeated running, jumping or high-intensity intervals. Foods high in fat or fibre digest more slowly and may increase fullness in some people, although individual responses vary.

Rather than applying a universal cut-off, use the available time to decide the scale of the meal:

• Several hours available: a familiar mixed meal containing carbohydrate, protein and normal fluids.
• About one to two hours: a smaller meal or snack, with portions adjusted to appetite and tolerance.
• Very little time: if food is needed, choose a small, familiar option that has already been tolerated before similar exercise.

Novel foods, unusually large portions and aggressive supplement combinations are poor experiments on an important training or competition day.

The EFWA TIME framework

TIME is an EFWA educational framework for turning general evidence into a practical pre-exercise decision. It is not an individual diet prescription.

T — Task

Define the session: duration, intensity, start time and whether performance is a priority. Longer endurance work usually creates a stronger case for deliberate carbohydrate planning than a short mobility or technique session.

I — Interval

How long has it been since the last meal, and how long remains before exercise? These two intervals determine whether another meal is needed and how large it can comfortably be.

M — Meal tolerance

Use foods and portions the person digests well. Record patterns if discomfort recurs. A food can be nutritious yet poorly suited to the final hour before a particular activity.

E — Evaluate

After comparable sessions, review hunger, comfort, perceived energy and performance. Change one feature at a time—such as portion size or timing—so the response is interpretable.

Two worked examples

Evening resistance session: a client ate a balanced lunch and will train after work. They notice that arriving hungry reduces concentration. A familiar snack containing carbohydrate and some protein one to two hours beforehand may be more useful than a large last-minute meal. The trainer observes session quality but does not prescribe a clinical diet.

Long morning ride: a cyclist plans more than 90 minutes of steady and higher-intensity work. Here, deliberate carbohydrate before the session is more relevant. The rider tests the meal during ordinary training, adjusts the timing to digestive comfort and also plans fluids and any during-exercise nutrition separately.

What is established, emerging and interpretive?

• Established evidence: pre-exercise carbohydrate can support prolonged endurance performance; overall dietary adequacy remains more important than one isolated meal.
• Emerging evidence: the long-term effects of training with deliberately low carbohydrate availability depend on the protocol, population and performance goal.
• EFWA educational position: the smallest effective pre-exercise meal is the one that supports the task while remaining comfortable and repeatable.

Professional scope and referral

Fitness professionals can discuss general healthy-eating principles within their qualification and local scope. They should not diagnose nutrient deficiencies or prescribe treatment diets. Clients with diabetes, recurrent gastrointestinal symptoms, food allergies, eating-disorder risk, pregnancy-related needs or other clinical concerns should be referred to an appropriately qualified dietitian or clinician.

Nutrition is only one part of preparation. EFWA’s guide to designing a warm-up without creating fatigue shows how to prepare the training task itself. Students can explore programme design through EFWA’s Personal Trainer education routes and find further resources in the EFWA Knowledge Hub.

Evidence limitations

Much of the pre-exercise nutrition literature involves endurance athletes, controlled laboratory tasks or performance outcomes rather than ordinary gym participation. Foods, meal sizes and timing differ across studies, and individual gastrointestinal responses are substantial. Evidence therefore supports principles and testing, not a universal menu. People with medical or specialist nutritional needs require individual advice outside a general fitness professional’s scope.

References

1. Aird, T. P., Davies, R. W., & Carson, B. P. (2018). Effects of fasted vs fed-state exercise on performance and post-exercise metabolism: A systematic review and meta-analysis. Scandinavian Journal of Medicine & Science in Sports, 28(5), 1476–1493. https://doi.org/10.1111/sms.13054
2. Kerksick, C. M., Arent, S., Schoenfeld, B. J., Stout, J. R., Campbell, B., Wilborn, C. D., Taylor, L., Kalman, D., Smith-Ryan, A. E., Kreider, R. B., Willoughby, D., Arciero, P. J., VanDusseldorp, T. A., Ormsbee, M. J., Wildman, R., Greenwood, M., Ziegenfuss, T. N., Aragon, A. A., & Antonio, J. (2017). International Society of Sports Nutrition position stand: Nutrient timing. Journal of the International Society of Sports Nutrition, 14, 33. https://doi.org/10.1186/s12970-017-0189-4
3. Rothschild, J. A., Kilding, A. E., & Plews, D. J. (2020). What should I eat before exercise? Pre-exercise nutrition and the response to endurance exercise: Current prospective and future directions. Nutrients, 12(11), 3473. https://doi.org/10.3390/nu12113473
4. Thomas, D. T., Erdman, K. A., & Burke, L. M. (2016). Position of the Academy of Nutrition and Dietetics, Dietitians of Canada, and the American College of Sports Medicine: Nutrition and athletic performance. Journal of the Academy of Nutrition and Dietetics, 116(3), 501–528. https://doi.org/10.1016/j.jand.2015.12.006