Post-Race Recovery Nutrition: What to Eat in the First 48 Hours

Post-race recovery nutrition explained hour by hour: carbohydrate and protein targets, fluid replacement, and what to eat when your appetite has vanished.

You cross the line, someone hands you a beer and a slice of pizza, and your recovery nutrition plan ends there. For a 10 km that is fine. After a mountain 50 km or a 100 miler, the 48 hours that follow determine whether you feel human by Wednesday or drag a wrecked, inflamed body around for two weeks. Ultra finishes leave you with depleted glycogen, damaged muscle fibres, a gut that has been shut down for hours, and a fluid deficit you cannot fix in one sitting. Each of those needs a different fix, and they do not all happen at the same time.

The first 30 minutes: lower your expectations

The classic advice is to slam carbs and protein inside a 30 minute window. That advice comes from studies of athletes who need to perform again within eight hours, which is not you.

Carbohydrate intake of 1.0 to 1.2 g per kg of body mass per hour maximises glycogen resynthesis, and the rate is highest in the first one to two hours after exercise (Alghannam et al., 2018). But the same review notes that when recovery is longer than about eight hours, total daily intake matters far more than the timing of the first meal.

So after an ultra, the real first-30-minutes goal is more modest:

  • Get fluid in, sipped rather than gulped
  • Get some sodium in, because you are almost certainly depleted
  • Get whatever carbohydrate your stomach will accept without a fight

If all you can manage is a cola and a handful of crisps, that is a legitimate start. Forcing 100 g of carbohydrate into a shut-down gut usually ends with it coming back up.

Why your stomach has quit

Prolonged running reduces blood flow to the gut and compromises intestinal barrier function, a cluster of effects described as exercise-induced gastrointestinal syndrome (Costa et al., 2017). Splanchnic blood flow does not snap back the moment you stop.

Give it 30 to 60 minutes of easy walking, fluid, and light salted food before attempting a real meal.

Hours 1 to 6: the window that actually matters

Once your stomach reopens, this is where recovery nutrition earns its keep.

Carbohydrate. Aim for 1.0 to 1.2 g/kg in the first hour you can eat properly, then repeat hourly for four to six hours if you can. A 70 kg runner is looking at 70 to 85 g per serving, which is roughly a large bowl of rice with a banana, or two sandwiches, or 750 ml of fruit juice plus a pastry.

Protein. 0.3 to 0.4 g/kg per feeding, so 20 to 30 g for most runners, repeated every three to four hours. Protein co-ingestion helps most when carbohydrate intake falls below about 0.8 g/kg/hr, which after an ultra is most people (Alghannam et al., 2018).

Fluid and sodium. Replace roughly 125 to 150% of the fluid deficit over the following six hours, and take it with sodium. Drinking plain water after a big sodium loss just makes you urinate it out.

What to skip. Not alcohol, exactly, but understand the trade. A couple of beers will not undo your race. Heavy drinking impairs muscle protein synthesis and disrupts the sleep that does most of your repair work.

A practical first-six-hours sequence

For a runner finishing a hot 50 km at 3pm:

  • 3:00 to 3:30pm, walking around: 500 ml electrolyte drink, salted crisps, cola
  • 3:30 to 4:30pm: proper meal, rice or pasta with chicken, plus fruit juice
  • 6:00pm: sandwich, yoghurt, more fluid
  • 8:00pm: full dinner, carbohydrate-heavy, 25 to 30 g protein
  • Through the evening: 2 to 3 litres of fluid total, sipped, with sodium

Day one to day two: repair, not refuel

By the morning after, glycogen is largely a solved problem if you ate reasonably. What remains is muscle damage, inflammation, and immune suppression, and those run on a slower clock.

Protein spread across the day. Total daily intake of 1.6 to 2.0 g/kg, split into four or five feedings of 20 to 40 g each. Even distribution beats one large evening dose (Moore, 2015).

Keep carbohydrate high. Do not start cutting carbs on day two because you are not training. Glycogen restoration after severe depletion takes 24 to 72 hours, and immune function is worse when energy availability is low.

Do not diet. The urge to compensate for race week eating is common and counterproductive. Sustained low energy availability, below roughly 30 kcal/kg of fat-free mass per day, drives the cluster of problems the IOC groups under relative energy deficiency in sport (Mountjoy et al., 2023). The days after an ultra are the worst possible time to enter that territory.

What about anti-inflammatory foods

Tart cherry juice, omega-3s, and polyphenol-rich foods have modest evidence for reducing soreness markers. They are a reasonable addition and a poor substitute for eating enough.

One caveat that matters: high-dose antioxidant supplements taken chronically can blunt training adaptation. Whole foods are the safer route. A handful of berries costs you nothing.

The mistakes that cost you a week

  • Under-eating on day one because you have no appetite. Appetite is suppressed after long efforts. Eat on a schedule rather than on hunger for the first 24 hours.
  • Replacing fluid without sodium. This dilutes you and drives more urine output.
  • Treating soreness as the only signal. Muscle damage markers stay elevated well past the point where you stop feeling sore, which is why runners re-injure themselves the following weekend.
  • Skipping protein at breakfast. Most runners get 5 g at breakfast and 50 g at dinner. Spread it out.
  • Going straight back to training to burn off the race meals. Our guide on recovery protocols after a long trail run covers how to structure the return.

Trailia tracks the load you have just absorbed and adjusts the following weeks automatically, so the plan reflects what your body actually did rather than what the calendar said it would do. You can see how that readiness picture is built with the Race Readiness tool.

Scaling recovery nutrition to the race

Not every finish needs a 48 hour protocol.

  • Under 2 hours: a normal meal within a couple of hours is enough
  • 2 to 5 hours: front-load carbohydrate for six hours, then eat normally with slightly more protein
  • 5 to 12 hours: the full first-day protocol, elevated intake for two to three days
  • Over 12 hours: expect appetite suppression for 24 to 48 hours, keep eating on a schedule, and plan for four to seven days of elevated needs

Heat and altitude both raise the fluid and sodium side of the equation. If you have just run a hot race, our electrolyte guide is the companion piece.

Key takeaways

  • The 30 minute window matters less than getting fluid, sodium, and any tolerated carbohydrate in early
  • Target 1.0 to 1.2 g/kg of carbohydrate per hour for the first four to six hours you can eat
  • Spread 1.6 to 2.0 g/kg of protein across four or five feedings per day for two days
  • Replace 125 to 150% of fluid losses with sodium alongside
  • Do not restrict calories after a hard race, because low energy availability delays every part of repair

Where to go from here

Write your recovery nutrition plan before the race, the same way you write the fueling plan. Put a drop bag at the finish with the food you know you can eat when nothing sounds good, and set alarms for the first three feedings. The runners who bounce back fastest are rarely the ones with the best supplements. They are the ones who ate on a schedule while everyone else waited to feel hungry.

Trailia builds the training block that follows your race around the load you actually absorbed, adapting week by week as your recovery markers come back.

Citations

  • Alghannam, A. F., Gonzalez, J. T., & Betts, J. A. (2018). Restoration of Muscle Glycogen and Functional Capacity: Role of Post-Exercise Carbohydrate and Protein Co-Ingestion. Nutrients, 10(2), 253.
  • Moore, D. R. (2015). Nutrition to Support Recovery from Endurance Exercise: Optimal Carbohydrate and Protein Replacement. Current Sports Medicine Reports, 14(4), 294-300.
  • Costa, R. J. S., Snipe, R. M. J., Kitic, C. M., & Gibson, P. R. (2017). Systematic review: exercise-induced gastrointestinal syndrome, implications for health and intestinal disease. Alimentary Pharmacology & Therapeutics, 46(3), 246-265.
  • Mountjoy, M., Ackerman, K. E., Bailey, D. M., et al. (2023). 2023 International Olympic Committee's (IOC) consensus statement on Relative Energy Deficiency in Sport (REDs). British Journal of Sports Medicine, 57(17), 1073-1097.
  • Kerksick, C. M., Arent, S., Schoenfeld, B. J., et al. (2017). International society of sports nutrition position stand: nutrient timing. Journal of the International Society of Sports Nutrition, 14, 33.

Frequently Asked Questions

What should I eat immediately after an ultramarathon?

Start with fluid, sodium, and whatever carbohydrate your stomach will accept, which is often cola and salted crisps rather than a proper meal. Blood flow to the gut is still reduced after hours of running, so forcing a large meal down usually backfires. Give it 30 to 60 minutes of walking and sipping before eating properly.

How much carbohydrate do I need for recovery nutrition after a race?

Aim for 1.0 to 1.2 grams per kilogram of body mass in the first hour you can eat properly, repeated hourly for four to six hours. For a 70 kg runner that is 70 to 85 grams per serving. Glycogen resynthesis is fastest in the first one to two hours, but total daily intake matters more when you have days rather than hours to recover.

Is the 30 minute recovery window real?

It matters most when you have to perform again within about eight hours, which does not apply after an ultra. With a full day or more before your next effort, total intake across the day outweighs the timing of the first meal. Get fluid and sodium in early and stop stressing about the clock.

How much protein should I eat after a long trail race?

Target 1.6 to 2.0 grams per kilogram of body mass per day, split into four or five feedings of 20 to 40 grams each. Even distribution across the day supports repair better than one large evening dose. Keep this up for at least two days after a long race.

Why do I have no appetite after an ultra?

Prolonged running suppresses appetite hormones and reduces gut blood flow, so hunger signals often vanish for 24 to 48 hours. This is why so many runners under-eat exactly when they need calories most. Eat on a schedule rather than waiting to feel hungry.

Should I drink alcohol after a trail race?

A couple of beers will not undo your race, but heavy drinking impairs muscle protein synthesis and disrupts the sleep that does most of your repair. If you plan to celebrate, get a real meal and plenty of fluid in first. Treat the alcohol as an addition rather than a replacement.

How much fluid should I replace after a race?

Roughly 125 to 150% of your fluid deficit over the following six hours, taken with sodium. Plain water after a large sodium loss mostly ends up as urine rather than restored blood volume. Sip steadily instead of drinking large volumes at once.

Can I diet after a race to lose the weight I gained?

Restricting calories in the days after a hard race is a poor idea. Sustained low energy availability, below about 30 kcal per kg of fat-free mass per day, impairs bone health, immune function, and hormonal balance. Most of the immediate post-race weight is fluid and glycogen storage anyway.

Do tart cherry juice and antioxidants help recovery?

There is modest evidence that tart cherry juice and polyphenol-rich foods reduce soreness markers after endurance events. They are a reasonable addition but no substitute for eating enough total energy. High-dose antioxidant supplements taken chronically can actually blunt training adaptation, so favour whole foods.

How long does recovery nutrition need to stay elevated?

It scales with the race. After a two to five hour effort, expect one to two days of slightly elevated intake, while a race over twelve hours can raise needs for four to seven days. Muscle damage markers stay elevated well past the point where soreness fades.