Three Matches in Five Days: Fuelling a Congested Preseason Block
Preseason week two for a Division I women's soccer team. A 20-year-old central midfielder (63 kg, 168 cm) has completed eight sessions in six days: 90-minute morning field sessions at 9:00 a.m. in 29 degrees C heat, followed by 60-minute afternoon strength and speed blocks at 4:00 p.m. She is scheduled to play three matches in five days starting tomorrow. The performance staff note that her session RPE has climbed from 5 to 8 across the week while total distance covered has fallen 12%; she reports heavy legs and says she feels empty about 60 minutes into sessions. She lost 0.9 kg across a single morning session despite drinking from a bottle, and her afternoon urine colour was 5 on an 8-point chart. Dietary recall shows a 7:00 a.m. coffee, no breakfast, a turkey sandwich at noon, and dinner at 8:30 p.m., totalling roughly 180 g of carbohydrate for the day. She has no history of menstrual dysfunction and reports regular cycles. She asks whether she should start a keto-ish approach to get leaner and lighter for the season.
1. Explain the physiology behind her late-session emptiness and the falling distance-to-RPE ratio, and why her current intake cannot support this week.
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Where the fuel runs out. Liver glycogen is roughly 80-100 g and is what protects blood glucose overnight and between meals. With only coffee before a 9:00 a.m. session she starts partly liver-depleted. Muscle glycogen in a 63 kg athlete is roughly 300-400 g, and a 90-minute soccer session can oxidise 100-150 g. Two sessions less than 12 hours apart, on about 180 g of carbohydrate for the whole day, means she never restores what she used. The deficit compounds across the week.
Why that appears as heavy legs and falling distance. As glycogen falls, the same absolute running speed costs more perceived effort, so session RPE rises while distance falls - exactly the pattern recorded. Late-session emptiness is consistent with falling blood glucose affecting the central nervous system, not only the muscle.
Hydration compounds it. A 0.9 kg loss in one session is about 1.4% of body mass, and urine colour 5 suggests she is starting sessions below euhydration. Dehydration beyond roughly 2% of body mass raises cardiovascular strain and perceived effort and degrades intermittent high-intensity performance.
Why more willpower is not the answer. Nothing here suggests a motivation problem; the training load has outgrown the fuel supply. That distinction matters, because the fix is a plan, not a talking-to.
What cannot work. A ketogenic or keto-ish approach reduces carbohydrate availability for exactly the repeated-sprint demands that decide her matches, and adds avoidable risk in an athlete who is already showing signs of under-fuelling.
2. Calculate defensible carbohydrate and fluid targets for her and build a 24-hour fuelling timeline around tomorrow's 7:00 p.m. match.
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Targets for a 63 kg player in this block
- Carbohydrate: 8-10 g/kg/day, roughly 500-630 g. The 6-10 g/kg range covers moderate-to-high training loads, and three matches in five days sits at the top of it.
- Protein: about 1.6 g/kg, roughly 100 g/day, in 3-4 feeds of 25-30 g.
- Fluid: replace 125-150% of the 0.9 kg session loss, so about 1.1-1.4 L over the 2-4 hours afterwards, with sodium, on top of normal intake. Goal is urine colour 1-3 or urine specific gravity 1.020 or lower before the next session.
Match-day timeline, 7:00 p.m. kickoff
- 7:00 a.m. breakfast: 100-120 g carbohydrate (oats, fruit, yoghurt) plus protein.
- 10:00 a.m. snack: 40-60 g carbohydrate.
- 12:30 p.m. lunch: 120-150 g carbohydrate, moderate fibre, lean protein.
- 3:30-4:00 p.m. pre-match meal, 3-4 hours out: 100-150 g carbohydrate, low fat and low fibre, 25-30 g protein.
- 5:45-6:15 p.m.: 30-60 g easy carbohydrate.
- Warm-up and halftime: carbohydrate-electrolyte drink, aiming at 30-60 g/h during a 90-minute match.
- Within 30-60 minutes after: 1.0-1.2 g/kg carbohydrate (roughly 60-75 g) with 25 g protein, then a meal within two hours, because the next match is inside 24-48 hours.
Monitoring and adjustment. Daily first-morning body mass, urine colour, and session body-mass change. If she is still losing 0.9 kg per session on this plan, her sweat rate exceeds the replacement - increase the plan rather than asking her to tolerate the deficit.
3. She asks whether she should go keto-ish to get leaner and lighter. What do you say, and what do you explicitly not do?
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Take the goal seriously before challenging the method. Wanting to be leaner and lighter is a legitimate performance question, and dismissing it ends the conversation. Then separate the request from the goal: the real question is not whether low-carbohydrate diets exist, but whether one is safe and useful for a midfielder in a three-matches-in-five-days block who is already showing markers of inadequate energy intake - rising RPE at fixed load, feeling empty late in sessions, 1.4% body-mass fluid losses.
What the context argues against. High-intensity intermittent performance depends on carbohydrate availability. Restricting it during a congested block reduces training quality and adds risk of low energy availability, which for a female athlete carries menstrual, bone and immune consequences. Lighter is also not automatically faster.
What I would say I cannot do. I would not design or endorse a ketogenic diet, set her a calorie or macronutrient target outside my scope, or treat her body weight as a target I am responsible for. That belongs to the sports dietitian, with the team physician involved if any disordered-eating indicators appear.
What I would do. Refer her to the sports dietitian with a specific question - can we pursue body composition without compromising this block - and deliver the fuelling plan now, because correcting the deficit may change her body composition and her performance without any diet at all. I would also say plainly that if she wants to revisit composition, we do it after the congested block, not inside it.