Soccer Nutrition: Are Elite Players Eating Enough?

Soccer nutrition is often discussed in terms of what players should avoid: too much sugar, processed foods, excessive body fat or poorly chosen supplements. Yet one of the biggest nutritional performance problems in modern soccer may involve something much simpler. Some players may not consistently consume enough total energy and carbohydrate to match the physical demands being placed upon them through training and competition.

That question has been brought into sharper focus by a major 2026 scoping review and meta-analysis examining nutrition in professional and semi-professional soccer. Researchers synthesised 57 studies involving male and female players and found that, across the studies in which energy intake could be compared with energy expenditure, reported intake was consistently lower than estimated expenditure. The calculated deficits reached approximately 741 kcal per day in male players and 544 kcal per day in female players, while reported carbohydrate intake frequently sat towards the lower end of recommended ranges and appeared particularly limited in female players. The researchers appropriately cautioned that dietary under-reporting and methodological limitations make exact energy deficits difficult to determine, but the overall picture raises an important performance question for the modern game.

Elite soccer players are being asked to complete increasingly demanding training weeks involving high-intensity running, repeated acceleration and deceleration, strength work, tactical training and frequent competition. Some players also experience extensive travel and international duty, while academy and younger professionals may still be growing and developing physically. In that environment, nutrition is not simply about eating what would conventionally be described as a healthy diet. Players need to consume enough energy and the appropriate nutrients at the right times to support the work they are actually being asked to complete.

This distinction matters because a meal can look extremely healthy while still providing insufficient fuel. A large salad accompanied by lean protein may contain excellent micronutrients and high-quality protein, yet provide far less carbohydrate and total energy than a player requires following a demanding training session. Similarly, a player focused heavily on becoming leaner may unintentionally reduce portion sizes during precisely the periods when physical and competitive demands are at their highest.

The more useful question for coaches and performance practitioners is therefore not simply whether the player is eating healthily. It is whether that player is appropriately fuelled for the work being performed. That principle is central to the ISSPF Soccer Nutrition pathway, which develops from the fundamentals of energy balance and macronutrients through to nutritional periodisation, dietary analysis and advanced individualised performance nutrition. Rather than treating diet as something separate from training, the objective is to connect nutritional intake directly with the demands of the soccer programme.

Soccer Nutrition Is About Fuelling the Work, Not Simply Eating Healthy Food

One of the first challenges in soccer nutrition is understanding that energy requirements are not fixed. The nutritional demand of a recovery day is very different from that of a high-load training day, while the requirements surrounding competition may differ again. Players who repeatedly follow exactly the same eating pattern regardless of training load can therefore create a mismatch between the energy being consumed and the physical work being performed.

This is where nutritional periodisation becomes particularly important. Just as coaches manipulate physical loading across the training week, nutrition can be adjusted according to the demands of individual days. Carbohydrate availability can increase around demanding training sessions and matches, while lower-load days may naturally require less total carbohydrate and energy. Protein can be distributed throughout the day to support muscle repair and adaptation, while hydration should reflect individual sweat losses, environmental conditions and the duration and intensity of training.

The UEFA expert group statement on nutrition in elite football supports this individualised approach and recommends a food-first philosophy in which nutrition is aligned with training, competition, body composition, travel, rehabilitation and player development. The significance for coaches is that there should not be one universal soccer diet. Effective performance nutrition has to respond to both the football programme and the individual player.

Carbohydrate becomes especially important because soccer repeatedly requires high-intensity actions and relies substantially on muscle glycogen. A 2024 systematic review examining carbohydrate intake and soccer performance reported that appropriately timed carbohydrate consumption before and during soccer could support sprint capacity, delay fatigue and help preserve aspects of technical and cognitive performance. Carbohydrate intake following competition also plays an important role in restoring glycogen, particularly when another demanding exposure follows within a relatively short period.

For coaches, the practical implication is straightforward. If training intensity and volume rise, nutritional support needs to respond. A demanding training day cannot be viewed only as an exercise-programming decision because it immediately creates consequences for what the player should consume before training, between sessions and during recovery.

This connection between training and nutrition is particularly well represented within ISSPF by Dr Liam Anderson, whose teaching covers soccer-specific carbohydrate requirements, energy expenditure and nutritional periodisation. Within the ISSPF Intermediate Certificate in Soccer Nutrition, his content examines the seasonal training and match calendar, the metabolic demands of soccer, carbohydrate requirements and the concept of fuelling for the work required.

Helen Bauhaus also contributes directly to this area through ISSPF modules examining soccer-specific carbohydrate and dietary fat requirements. Her applied background includes professional football, national-team athletes and academic work in nutrition science, making the relationship between research and practical sports nutrition particularly relevant to the article's central theme.

One of the biggest problems can arise when body-composition objectives begin to dominate performance preparation. There are legitimate situations in which changing body composition may support health or performance, but attempting to become continually lighter is not automatically beneficial. If energy intake is repeatedly reduced while training demand remains high, players may eventually compromise recovery, adaptation or health.

A lean physical appearance should therefore never be interpreted automatically as evidence of optimal fuelling. Coaches can observe what a player looks like, but performance nutrition needs to address what that player is being asked to do. A high-running midfielder completing repeated high-speed actions, accelerations and two matches in a week has very different nutritional demands from the same player during a light recovery period.

This is why nutrition should increasingly be integrated into the training microcycle rather than delivered through a generic diet sheet. The ISSPF Intermediate Certificate in Soccer Nutrition specifically covers carbohydrate requirements, energy demands, nutritional periodisation, dietary planning and player dietary analysis, helping coaches and practitioners understand how nutrition changes alongside the physical demands of soccer.

Editorial image placement: insert Image 1 here showing an appropriately balanced athlete meal or a soccer player refuelling around training.

When Eating Less Becomes Under-Fuelling

It is important to distinguish between negative energy balance, low energy availability and Relative Energy Deficiency in Sport, commonly known as RED-S, because these terms are sometimes incorrectly used interchangeably.

Energy balance broadly compares total energy intake with total energy expenditure. Energy availability is a more specific concept concerned with the amount of dietary energy remaining to support normal physiological functions after the energetic cost of exercise has been accounted for, relative to fat-free mass. RED-S describes a broader clinical syndrome in which problematic low energy availability may contribute to impaired physiological function, health and performance.

This distinction is particularly important when interpreting the new soccer research. The 2026 review identified lower reported energy intake than estimated expenditure, but measuring dietary intake accurately is extremely difficult. Players may forget food items, underestimate portion sizes or alter their behaviour while being monitored. Even high-quality research therefore contains uncertainty when estimating exactly how much energy athletes consume.

A 2024 study involving adolescent female national-team soccer players demonstrated the size of this measurement problem particularly clearly. When researchers compared self-reported dietary intake with estimates incorporating doubly labelled water and changes in body mass, the players under-reported intake by an average of approximately 499 kcal per day. Using self-reported intake suggested that 15% of the group had low energy availability, whereas the more objective approach reduced that estimate to 5%.

This demonstrates why coaches should not interpret the recent evidence as proof that every professional player is chronically energy deficient. What the research does suggest is that the relationship between training demand and energy intake deserves greater attention and that practitioners require better methods for understanding individual requirements.

The concern becomes more significant when under-fuelling is persistent rather than occasional. Players will naturally experience individual days when intake and expenditure do not match perfectly, and normal physiology can accommodate some short-term variation. Problems become more concerning when insufficient energy availability is sustained and begins interfering with recovery, adaptation, health or performance.

Female soccer has received increasing research attention in this area. Studies in professional women's football have identified players at varying levels of RED-S risk, although it is equally important to recognise that most players within these studies have not necessarily been classified as high risk. The appropriate conclusion is therefore not that low energy availability is inevitable in women's soccer, but that sufficient fuelling deserves proactive attention as physical and competitive demands continue to grow.

The wider evidence also demonstrates why body weight alone is an inadequate monitoring tool. A player can maintain relatively stable body mass while experiencing nutritional behaviours or physiological responses that warrant further investigation. Equally, persistent fatigue, recurrent injuries or menstrual changes should not automatically be attributed to nutrition without appropriately qualified medical and nutritional assessment. RED-S is a multidisciplinary clinical issue and not something that coaches should attempt to diagnose independently.

The most important role for coaches is therefore environmental. They can avoid creating cultures in which lighter automatically means fitter, recognise when training demands are increasing, ensure players have appropriate opportunities to eat and hydrate, and provide access to suitably qualified nutrition expertise where possible. Coaches can also consider the language they use around body composition because repeated focus on weight can unintentionally influence player behaviour.

Youth players require similar care. Academy footballers may train several times each week, complete gym work, attend school and continue growing and maturing physically. A nutritional strategy focused primarily on restricting energy intake can therefore conflict directly with both development and sporting performance. Training demands, growth, maturation and wider lifestyle all need to be considered before nutritional targets are established.

The wider ISSPF Nutrition pathway reflects this progression through Foundation, Intermediate and Masters-level study, allowing practitioners to move from basic nutritional principles towards more advanced individualised planning rather than reducing performance nutrition to calorie restriction or simple lists of permitted and prohibited foods.

Editorial image placement: insert Image 2 here showing a soccer player hydrating or refuelling following training.

From the Dining Room to the Pitch: Building a Better Fuelling Culture

Soccer nutrition becomes most effective when it is integrated into the football programme rather than delivered as a separate classroom lecture several times each season. Players need to understand why their requirements change, while clubs need to make appropriate nutrition behaviour realistic within the daily environment.

A congested match week provides a simple example. If players compete on Saturday and again on Tuesday, the recovery priorities immediately following the first fixture differ from a week containing six days before the next game. Carbohydrate restoration becomes more urgent, hydration requires attention and protein intake should support repair and adaptation. The training programme and nutritional programme therefore need to communicate with each other.

The same principle applies to double-session days. A player completing an intensive morning field session followed by afternoon strength training requires a different fuelling strategy from someone completing only tactical recovery. If a club asks athletes to train at high intensity twice in one day while providing insufficient time or food between sessions, the problem becomes organisational rather than simply the responsibility of individual players.

The phrase “nutrition compliance” can sometimes hide these environmental issues. Coaches and practitioners may criticise players for poor eating habits without considering what food is available, how much time players have between activities, whether cultural preferences are accommodated or whether travel arrangements make appropriate fuelling difficult. Good performance nutrition therefore requires systems as well as education.

This is where Dr Lloyd Parker provides an especially relevant ISSPF practitioner connection. Parker is currently Lead Performance Nutritionist at Aspire Academy and previously spent more than seven years at Everton, including roles as first-team nutritionist, Head of Nutrition and Assistant Head of Sport Science & Nutrition. His applied work has included first-team performance, recovery, body-composition management, supplementation and the integration of nutrition into wider sport-science and medical structures.

Within the ISSPF Intermediate Certificate in Soccer Nutrition, Parker delivers the module examining the required skill set of the soccer nutritionist. Importantly, the content does not focus simply on knowing more nutritional science. It examines building trust with players and staff, finding practical opportunities to improve nutrition within elite soccer and using behavioural-change approaches to positively influence player habits.

That behavioural component is particularly important when addressing under-fuelling. Knowing that players require more carbohydrate does not automatically mean they will eat more carbohydrate. A player may deliberately restrict food because of body-composition concerns, lack appetite following intense training, misunderstand the role of carbohydrates or simply have insufficient time between training and another responsibility. The practitioner therefore has to understand both the science and the behaviour preventing the player from applying it.

This is also why nutrition education should avoid unnecessary complexity. Players do not need to understand every biochemical pathway before they can improve their fuelling. They do need to appreciate that demanding training requires appropriate energy intake, carbohydrates are a major fuel source for high-intensity soccer, protein supports repair and adaptation, and hydration can influence both health and performance.

A practical approach is to connect nutrition directly with the training microcycle. Instead of presenting foods as universally good or bad, practitioners can explain what the day is designed to achieve. High-load training days generally require greater carbohydrate availability. Match days require planned pre-match fuelling and, where appropriate, carbohydrate intake around competition. Recovery periods require replenishment, hydration and protein to support repair. Lighter days may allow overall intake to fall naturally alongside reduced expenditure.

Players also require individualisation. Two teammates completing the same nominal session may differ in body size, position, total running demand, playing status, maturation, goals and previous nutritional history. A goalkeeper and a high-running central midfielder should not automatically receive identical energy targets because they train within the same team.

The principle extends beyond professional soccer. Grassroots and semi-professional clubs may not have access to a full-time sports nutritionist, but coaches can still organise sensible meal breaks, encourage players to arrive appropriately fuelled, provide useful recovery options and avoid prescribing restrictive diets outside their own professional competence.

The broader objective should be to create a culture in which eating enough is recognised as a legitimate performance behaviour. Players often understand the importance of another gym session or running block because those activities visibly resemble athletic development. Consuming enough carbohydrate and total energy can appear less like training, yet adaptation to that training partly depends on whether the body has adequate resources available.

This is why the phrase “eat clean” can become unhelpful when interpreted too rigidly. Foods rich in micronutrients, fibre and high-quality protein are essential components of a healthy diet, but a high-level soccer player with substantial energy expenditure may struggle to meet requirements if every meal is extremely bulky and low in energy density. Performance nutrition requires health and fuelling to coexist.

The most responsible conclusion from the latest research is therefore not that elite soccer has discovered a universal under-fuelling crisis. The evidence does not justify that level of certainty. A more accurate interpretation is that reported energy intake and carbohydrate availability frequently appear low relative to the demands of elite soccer, measurement remains challenging, and coaches and practitioners should take the possibility of inadequate fuelling seriously rather than assuming that professional status automatically guarantees adequate nutritional intake.

For coaches, this changes where nutrition sits within the performance programme. It should not become relevant only when a player wants to lose weight, suffers an injury or asks which supplement to take. Nutrition should form part of normal weekly planning because every physical training decision creates a nutritional consequence.

The ISSPF Intermediate Certificate in Soccer Nutrition develops this applied approach through soccer-specific modules covering energy demands, carbohydrate, nutritional periodisation, player behaviour, dietary planning and individual dietary analysis. For coaches and practitioners wanting to connect the food players consume with the physical work they are expected to perform, the programme provides a pathway from basic nutritional knowledge towards genuinely integrated soccer performance nutrition.

Take the ISSPF Intermediate Certificate in Soccer Nutrition and develop a stronger understanding of how to fuel training, competition and recovery around the real demands of the modern game.