The London Marathon is one of the world's great sporting events — and one of the most nutritionally demanding challenges a recreational athlete will undertake. For the majority of runners who complete it in four to six hours, nutrition management from training through to post-race recovery is as important as any training block. This guide covers the complete nutritional picture for London Marathon runners.
Training Nutrition
Marathon training — which typically involves 40–60 miles of running per week at peak — creates significantly elevated nutritional requirements. Carbohydrate needs increase substantially: 5–7g per kg body weight on moderate training days, up to 8–10g on long run days. Protein requirements increase for muscle repair and adaptation: 1.4–1.7g per kg daily is appropriate for most marathon runners.
The most common nutritional mistakes in marathon training: not eating enough during heavy training weeks (chronic underfuelling impairs adaptation and increases injury risk); inadequate carbohydrate around long runs (running long in a depleted state trains fat metabolism but should not be the default on all long runs); and neglecting iron status (long-distance running increases iron requirements significantly through foot-strike haemolysis and sweat losses).
Carbohydrate Loading for the Marathon
For most marathon runners, carbohydrate loading in the two to three days before the race is beneficial. The protocol: reduce training volume significantly; increase carbohydrate intake to 10–12g per kg body weight daily; choose easily digestible carbohydrates and reduce fibre to minimise gastrointestinal risk on race day. The London Marathon is run in mid-April, providing comfortable temperature conditions — though weather variability means hydration planning should account for the full temperature range. Read our complete carbohydrate loading guide.
Race Day Nutrition
The standard race day nutrition principle: consume 30–60g of carbohydrate per hour during the marathon, beginning in the first 30 minutes before fatigue develops. Sports gels, chews, bananas, and sports drinks are all viable sources. Water should accompany gel intake to support absorption. The London Marathon course has water stations approximately every mile in the second half — use them.
The pre-race breakfast, eaten two to three hours before the start, should be familiar, easily digestible, and carbohydrate-based: white toast, banana, and a moderate amount of familiar protein. Race day is not the time for dietary experimentation.
Recovery Nutrition
Post-marathon recovery nutrition begins as soon as possible after finishing: 20–30g of protein plus 40–60g of carbohydrate within 30–45 minutes accelerates glycogen resynthesis and muscle repair. For the 24–48 hours post-race, protein at every meal and adequate total calories support the repair of exercise-induced muscle damage. Anti-inflammatory foods — berries, oily fish, turmeric — support the recovery of the significant inflammation that marathon running produces. The British Heart Foundation notes marathon running as an excellent long-term cardiovascular investment for participants. See our sport injury recovery guide for nutrition around any training injuries.
Fuel Your Training With Vanda's Kitchen
Quality daily nutrition is the foundation of consistent athletic performance. Vanda's Kitchen's fresh Filipino-inspired lunches — certified halal, 100% nut-free — provide lean proteins, complex carbohydrates, and fresh vegetables for active London professionals. Sport England and the British Heart Foundation both emphasise regular activity combined with balanced diet as the most effective health investment. View our team lunch options or WhatsApp us.
Frequently asked questions
What should you eat in the 48 hours after the London Marathon to aid recovery?
The 48-hour post-marathon window requires sustained attention, not just an immediate recovery meal. Prioritise protein at every meal — 30 to 40 grams each sitting — to support repair of the significant muscle damage that marathon running causes. Carbohydrate-rich meals restore depleted glycogen. Anti-inflammatory foods including oily fish, berries, and leafy greens support the resolution of the acute inflammation that typically peaks 24 to 48 hours after finishing.
How much water should you drink during the London Marathon?
Hydration strategy should be based on thirst rather than a fixed volume, as over-drinking plain water during a marathon carries the risk of hyponatraemia, a potentially dangerous drop in blood sodium. The London Marathon course provides water stations every mile in the second half — drinking to thirst at each station, and using sports drinks alongside water for events taking longer than three hours, is the evidence-based approach.
Can you use real food rather than gels during the London Marathon?
Real food is viable but requires more planning and gut training. Bananas, dates, and small pieces of rice cake are used by some recreational runners successfully. The practical challenge is portability and digestibility at race pace — the mechanical stress of running at marathon effort reduces gastrointestinal tolerance for solid food compared to cycling. Any real food strategy must be practised on long training runs, not introduced on race day.
How should I adjust marathon training nutrition in the final taper week?
The taper week combines reduced training volume with increased carbohydrate intake as part of the loading protocol. Total calorie intake may remain similar to or slightly above normal training weeks despite the reduced mileage, because the additional carbohydrate largely replaces training-related energy expenditure. Reduce fibre intake in the final two to three days to minimise gastrointestinal risk on race day.
Does caffeine improve London Marathon performance?
Caffeine is one of the most consistently evidence-supported performance supplements in endurance sport. Three to six milligrams per kilogram of body weight, taken 45 to 60 minutes before the start, reduces perceived effort and delays fatigue. For runners who regularly use caffeine, the effect is smaller but still present. Caffeine-containing gels taken mid-race can also provide a second stimulus if used strategically in the final third.