Most running nutrition advice focuses heavily on carbohydrates — and for good reason. But protein is the macronutrient that most recreational runners are further from their optimal target. Not because they avoid protein, but because the target for endurance athletes is meaningfully higher than most people assume.
How much protein do runners actually need?
The general population recommendation is 0.8g of protein per kg of body weight per day. For endurance athletes, the evidence points to a significantly higher requirement.
The research consensus
ISSN Position Stand: Endurance athletes require 1.4–1.7g/kg/day
More recent research: 1.8g/kg/day is suggested as appropriate for endurance athletes
A 70kg runner: approximately 98–126g protein per day
Sources: ISSA; ISSN Position Stand; Recommendations for Female Endurance Runners, Frontiers in Nutrition 2015
Why the higher requirement? Endurance running causes greater muscle protein breakdown than sedentary activity — particularly during longer sessions where amino acids contribute to energy production. Post-run protein synthesis — the repair and rebuilding process — requires adequate amino acid availability to actually occur.
Daily protein targets by weight
| Body weight | Minimum (1.4g/kg) | Target (1.6g/kg) | High training (1.8g/kg) |
|---|---|---|---|
| 60kg | 84g | 96g | 108g |
| 70kg | 98g | 112g | 126g |
| 80kg | 112g | 128g | 144g |
| 90kg | 126g | 144g | 162g |
Timing matters
Protein distribution across the day matters as much as total daily intake. The body can utilise approximately 25–35g of protein per meal for muscle protein synthesis purposes — beyond that, the excess is oxidised rather than used for repair. Front-loading protein at breakfast doesn’t carry over to the evening recovery window.
The most important window: within 30 minutes post-run. This is when muscle protein synthesis rates are highest and amino acid availability most directly drives recovery. 20–35g of a complete protein source (containing all essential amino acids) in this window produces meaningfully better recovery than waiting for the next meal.
“Spreading protein across four meals is more effective than eating the same total amount in two. The body’s ability to use protein for repair doesn’t scale linearly with dose.”
Best value protein sources
| Food | Serving | Protein | Cost tier |
|---|---|---|---|
| Eggs | 2 large | 12g | Very low |
| Canned tuna | 95g tin | 18g | Very low |
| Cottage cheese | 200g | 24g | Low |
| Greek yoghurt | 200g | 17g | Low–medium |
| Chicken breast (cooked) | 100g | 31g | Low–medium |
| Lentils (cooked) | 200g | 18g | Very low |
Chicken breast gives the highest protein density of any whole food. Eggs and canned tuna are the best value per gram of protein of any complete protein source — both are affordable, portable, and require minimal preparation.
Cottage cheese is particularly useful for endurance athletes: it’s high in casein protein (slow-digesting), making it an ideal pre-sleep protein source that supports overnight muscle repair after training days.
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Plant-based runners
Plant proteins are generally lower in one or more essential amino acids — most commonly leucine, which is the key trigger for muscle protein synthesis. Plant-based runners can absolutely meet their protein needs, but need to:
- Target the upper end of the protein range (1.8g/kg/day) to compensate for lower digestibility
- Combine protein sources across meals to ensure all essential amino acids are present (lentils + rice, chickpeas + quinoa)
- Consider soy protein as the most complete plant protein source, closest in profile to animal proteins
The gap between plant and animal protein is real but manageable. The adjustment is in total quantity and source variety, not in the fundamental targets.
Frequently asked questions
How much protein do runners need per day?
1.4–1.8g per kg of body weight. A 70kg runner needs approximately 98–126g per day — significantly above the general population recommendation of 0.8g/kg.
What is the best protein source for runners?
Chicken breast, eggs, canned tuna, Greek yoghurt, and cottage cheese are the best value complete protein sources. Lentils and chickpeas for plant-based options, combined across meals.
When should runners eat protein?
Within 30 minutes post-run, 20–35g stimulates muscle protein synthesis at its highest rate. Distributing protein across 4 meals is more effective than eating the same total in 2.
Do long distance runners need more protein?
Yes. Marathon runners should target 1.6–1.8g/kg/day. After very long runs, greater muscle protein breakdown increases recovery protein needs.
Is a protein shake necessary for runners?
Not necessary, but convenient for hitting post-run timing when a meal isn’t immediately available. Real food is preferable when timing allows.