How soon after a run should I eat?

Within 30-60 minutes if you're training hard or running again in 24 hours. If the next hard effort is 48+ hours away, the window is 30-120 minutes and exact timing matters less than total daily intake.

What's the best ratio of carbs to protein after a run?

3:1 or 4:1 carbs to protein is traditional and supported. In practice: 1 g/kg carbs + 20-30 g protein. For a 70 kg runner, that's 70 g carbs + ~25 g protein.

Is the '20-minute anabolic window' real?

Mostly a myth for single-session recovery. Current research supports a 2-hour window for muscle protein synthesis and glycogen replenishment. The 20-minute rule was based on older studies and doesn't hold up.

How much fluid should I drink after a run?

125-150% of sweat-weight loss over 4 hours post-run. Weigh yourself before and after (or estimate). A 2 lb loss = roughly 1.1 liters to replace, with sodium included.

What's a good post-long-run meal?

Burrito, pancakes with protein, teriyaki bowl, eggs with toast and potatoes, pasta with meat sauce. The meal that sounds good is usually the one your body is signaling for — follow it.

Do I need a recovery shake?

Not if you eat a real meal within 60-90 minutes. Shakes help if you're not hungry, traveling, or running back-to-back sessions. A banana + protein powder + milk works fine.

Should I eat if I did a short easy run?

No special post-run meal needed. A normal next meal is plenty. Special recovery nutrition matters for long runs, workouts, and races, not 4-mile recovery jogs.

What should I eat the day after a marathon?

Normal food plus 10-20% more total calories than usual. Protein toward the upper end of your range (1.7-2.0 g/kg). Plenty of fluid. Anti-inflammatory foods (fatty fish, berries, greens) are nice but don't magically replace rest.

Post-Run Recovery Nutrition: The 30-120 Minute Window

Quick answer

Within 30-120 minutes, eat 1 g/kg of carbs + 20-30 g of protein. Replace 125-150% of sweat-weight loss in fluid over the next 4 hours, with sodium included. The "20-minute anabolic window" is mostly a myth — the window is actually about 2 hours for most runners.

What recovery nutrition is for

Three things happen in the hours after a long run or hard workout:

Muscle glycogen needs to be replaced (you just burned 300-500 g of it)
Muscle protein synthesis is elevated and needs amino acids to run on
Fluid and electrolyte balance need to come back to baseline

Recovery nutrition isn't about performance for that particular run — that's already done. It's about whether your Tuesday workout lands right after Sunday's long run, and whether you feel human again by dinner.

The "20-minute rule" is outdated

For two decades, runners were told they had a 20-minute post-workout window or they'd miss the "anabolic response." That advice came from studies that compared eating within 20 minutes to not eating for 3+ hours. The comparison was never 20 minutes vs 90 minutes.

More recent research (reviews by Aragon & Schoenfeld 2013, Jäger et al. 2017) supports a wider window — roughly 2 hours for most athletes, with total daily protein and carb intake mattering more than precise timing. The practical takeaway: if you can eat in 30-60 minutes, great. If you need 90 minutes to get home and cook, you're not losing anything.

Exception: if you're running again within 24 hours (doubles, training camp, back-to-back races), start replacing glycogen sooner rather than later. Sugar is your friend here.

What to eat

The simple formula

1 g/kg of carbs + 20-30 g of protein, inside 60-90 minutes if possible.

For a 70 kg runner: 70 g carbs + 25 g protein. Options that hit that:

Chicken burrito (large)
Teriyaki rice bowl with chicken
Pasta with meat sauce + salad + bread
3 eggs + toast + hashbrowns + a banana
Protein pancakes + berries + syrup
Turkey sandwich + chips + apple
Bagel with cream cheese + smoked salmon + banana
Oatmeal + protein powder + peanut butter + honey + banana

Not one of these is engineered. None of them require a powder. They're normal post-run meals that happen to hit the target.

When a shake makes sense

A recovery shake is useful if:

You finished the run traveling (no kitchen)
You're not hungry yet but need calories (high-volume training, hot day)
You're doing a double and the next run is in 4-6 hours
You just DNF'd or bonked and your stomach is fragile

Standard recipe: 1 cup milk + 1 scoop whey (25 g protein) + 1 banana + 1 tbsp peanut butter + optional oats. ~500 kcal, 30 g protein, 50 g carbs. Goes down easy when solid food can't.

Fluid replacement

Weight-based estimate is the simplest tool:

Weigh yourself before the run
Weigh yourself within 15 minutes of finishing (after a quick pee, before breakfast)
The difference is sweat loss (1 lb = ~450 mL fluid)
Replace 125-150% of that loss over the following 4 hours

Why 125-150% instead of 100%? Some of what you drink gets peed out. Overshooting slightly accounts for that.

Include sodium. Fluid without sodium dilutes plasma and triggers the kidney to release it. A sports drink, a broth, or salty food with your meal is the practical fix.

After a marathon specifically

First 30 minutes

Honestly, whatever sounds good. Most runners want salty/fatty food (chips, pretzels, pizza) because sodium is depleted. Follow it. This is NOT the time to worry about "nutrition science" — it's the time to get calories and fluid back into a body that just ran 26.2.

60-90 minutes post-finish

Real meal with both carbs and protein. Burrito, burger, or pasta. Most race finish lines have something reasonable.

Rest of the day

Eat about 20% more than a normal day. You're not going to "overeat" after a marathon in any meaningful way — your body will use it for tissue repair and glycogen restocking.

Next 48-72 hours

Slight bump in protein (1.7-2.0 g/kg) to support tissue repair. Carbs normal-high. Anti-inflammatory foods (fatty fish, berries, greens, turmeric) are nice to include but they don't replace sleep and rest.

Alcohol

A beer at the finish is fine. Heavy drinking impairs glycogen replacement, protein synthesis, and sleep — all three things your body needs. If you're going to celebrate hard, time it 24+ hours post-race rather than at the finish line.

Common mistakes

Eating too little because you "deserve a small meal after a big day." You just burned 3,000+ kcal. A 500-kcal dinner is not recovery.
Skipping protein. Pure-carb recovery (pasta only, for example) misses muscle repair. Always pair.
Forcing a shake when you want real food. Real food wins when you have access. Shakes are for convenience, not superiority.
Forgetting sodium. Plain water + salt-free meal = you'll pee out half the fluid.
Trying intermittent fasting after a marathon. Wrong tool, wrong day.

Rest-day eating after a big training week

Rest days after 70+ mile weeks often need more food than the training days, not less. Muscle repair is still happening, glycogen is still being restocked. Don't drop calories on rest days just because you're not running. Keep protein constant; carbs can come down slightly; fat can come up to fill calorie need.

Marathon Nutrition Guide — race-day side
High-Mileage Training Nutrition — daily baseline
Ultra Running Fueling Strategy — longer recovery windows