Author: Abbie Smith-Ryan et al.
Journal: Sports Medicine (2026)

The Competitive Advantage of Nutrition

In modern football, talent alone is not enough. To maintain a tactical system over a 90-minute match and sustain a grueling season, players must be optimally fueled. Evidence shows that women footballers frequently fail to meet their energy and nutrient demands, optimal hydration status, and micronutrient needs. This results in fatigue, reduced match performance, slow recovery, and a significantly higher risk of injury and illness.

This paper argues that individualized nutritional strategies are a fundamental priority to optimize health, performance, and player availability (return-to-play).

Key 1: Understanding Energy Availability (The Fuel Gauge)

The most critical nutritional priority is maintaining Adequate Energy Availability (EA).

• Fueling vs. Under-Fueling: Think of energy as a fuel tank. If a player consumes just enough energy to cover the demands of training/match play, they have a “reduced” tank [128]. If they consume less than what is needed for training, they are in Low Energy Availability (LEA).
• The Cost of LEA: When a player is in LEA, the body goes into survival mode, shifting energy away from resting physiological functions (like bone health, immune function, and reproductive health) to prioritize movement.
• Coach Identification: LEA leads to serious health and performance issues, known as Relative Energy Deficiency in Sport (REDs). A player with LEA may experience disrupted sleep, poor concentration, digestive distress, frequent illness, longer recovery times, and decreased strength/power/endurance.

Key 2: The Role and Reality of Body Composition

The paper identifies that regular body composition assessments are a valuable tool, but they must be handled correctly by the medical or nutritional staff, not the head coach.

• No “Optimal” Formula: There is no single “optimal” body composition for all women footballers [90]. Composition varies naturally by individual, position (e.g., forwards differ from defenders), level of competition, and phase of the season.
• The Red Flag: Tracking changes in body composition (specifically fat mass vs. fat-free/muscle mass) is a primary way to detect LEA/REDs early, often before more serious consequences like stress fractures develop. Significant unexpected loss of fat or muscle mass should trigger a nutritional intervention.
• Hormonal Impact: Coaches must be aware that the menstrual cycle can impact the accuracy of certain measurement techniques (like bioelectrical impedance) due to fluid changes. Techniques like DXA or skinfolds are less affected.

Key 3: Match Day Nutrition (MD-1, MD, MD+1)

Optimizing fueling around match day is vital.

1. Match Preparation (MD-1)

Match preparation must not wait until the day before. For congested schedules (2-3 matches per week), fueling must be constant, as a full return to pre-match muscle glycogen levels can take 72 hours.

• Taper Training, Not Fueling: It is common to taper training volume before a match. Players must maintain high caloric intake during this time to ensure muscle glycogen stores are 100% full for kickoff.

2. Match Day (MD)

• Pre-Match (1-4h before): The focus is on easily digestible carbohydrates (high intake of 1-4~g/kg) to increase glucose availability while minimizing gastrointestinal (GI) distress.
• Half-Time (The Critical Window): Half-time nutrition is vital to sustain energy and muscle glycogen levels. Focus on easily digestible carbohydrates with minimal fiber, aiming for 30-60g. This should be combined with essential amino acids to facilitate recovery. Liquid options or sports drinks are excellent for players who can’t tolerate solid food.

3. Match Day + 1 (Recovery Focus)

Recovery must begin immediately post-match. MD+1 is an active fueling window.

• Carbohydrates + Protein (Immediately): Consume carbohydrates (to refuel glycogen) and protein (to repair muscle damage) as soon as possible after the match. Shakes or chocolate milk are easy, effective liquid options.
• Pre-Bed: A pre-bed protein option (such as >40g Casein) can support overnight recovery.
• Anti-Inflammatory Foods: MD+1 should prioritize antioxidant and anti-inflammatory rich foods (e.g., berries, cherries, dark leafy greens, fatty fish) to reduce exercise-induced muscle damage and soreness.

Key 4: Position-Specific Training Day Example (Case Study)

The paper provides a detailed, practical case study for an in-season female center midfielder (25 years, 167 cm, 65 kg) with estimated daily needs of ~3000 kcal.

• Macro Targets:
  • Carbohydrates: 6~g/kg of Body Mass (BM).
  • Protein: 2~g/kg BM.
  • Fat: 1.4~g/kg BM.
• Nutrient Timing (Training Day Example): This highlights how a player can hit these large targets by spreading intake across the day:
  • Meal 1 -> Pre Workout -> Training (CHO 30-60g) -> Meal 2 -> Snack -> Meal 3 -> Pre Bed

Key 5: Supporting the Under-Fueled Player

Coaches play a crucial role in supporting players identified with LEA. The paper provides a case study of a center back with fatigue and cramping whose performance and body composition (increased muscle, reduced fat mass) improved dramatically after a progressive, step-wise increase in energy intake.

Key 6: Hormonal Status Considerations (The Menstrual Cycle)

Coaches must move away from viewing the menstrual cycle as a barrier and instead view it as an opportunity for tactical optimization. The paper provides a detailed infographic breaking down nutritional adaptations.

1. Thermoregulation & Hydration

Hormones impact how the body handles heat.

• Estrogen: Lowers core body temperature (improves heat dissipation).
• Progesterone: Raises core body temperature.
• Luteal Phase (Pre-Menstrual, Days 15-28): Core temp is higher, and sweat rate may increase. Water retention is also common. discussing individual sweat rates, climate, and the cycle with players is essential.

2. Hormones & Fuel Utilization

• Early Follicular Phase (Menstruation, Days 1-5): This phase is associated with lower muscle glycogen levels due to increased carbohydrate breakdown. Prioritizing deliberate increases in carbohydrate intake is critical to negate this effect, improve energy, and offset symptoms like cramping.
• Luteal Phase (Pre-Menstrual): The body’s capacity for muscle glycogen restoration may be impaired if carbohydrate intake is insufficient. Coaches must ensure players prioritize carbohydrates for recovery in this window. Total energy expenditure rises in the LP, meaning players may need an additional 200–300 kcal/day just to maintain balance.
• Protein Needs: Elevated amino acid utilization in the LP may increase protein requirements.

3. Management of Symptoms

Nutrition can help manage performance-debilitating symptoms (70%+ of athletes report symptoms).

• Avoid Triggers: Limiting processed foods, alcohol, and caffeine is evidenced to reduce symptoms.
• Anti-Inflammatory Priority: Inflammation is highest during the late Luteal and early Follicular phases (the “pre-menstrual and menstrual windows”). increasing essential fatty acids (Omega 3) and antioxidants can help reduce symptoms, inflammation, and cramping.
• Hydration: Adequate hydration during menstruation is associated with reduced pain severity and bleeding duration.

Key 7: Hydration

Sweat rate varies massively (1-3 L/h) and is higher during matches than training.

• Practical Monitoring: Weigh players (in minimal clothing) before and after training/matches.
• The Replacement Rule: For every one pound (0.45 kg) lost, the player must consume 20-24 oz (600-720 mL) of fluid combined with electrolytes within 2-3 hours.

Conclusion for Coaches

Appropriate nutrition is not just about health; it is a critical strategy for performance maintenance and injury prevention. Coaches must foster an environment that prioritizes adequate energy intake and utilizes nutrition as a tool tailored to each player’s position, load, and hormonal status.

This summary was generated with the assistance of Gemini based on the original article, with the aim of translating the research into practical insights for coaches and practitioners.