Runners talk about carbohydrates constantly. Before a run, during a run, after a run – carbs are the fuel everyone focuses on. Protein tends to get treated as an afterthought, something you eat because you're supposed to, without really understanding why.
But protein plays a role in running that goes well beyond muscle building. It's what keeps your body from breaking down under the cumulative load of training, and getting enough of it consistently is one of the quieter levers that separates runners who recover well from those who always feel a little beaten up.
What Protein Actually Does
Protein is made up of amino acids – the building blocks your body uses to repair and build tissue. Every time you run, you create small amounts of damage in your muscle fibres. That's not a bad thing. It's a normal part of the adaptation process that makes you stronger and faster over time. But that repair process requires raw materials, and those raw materials come from protein.
You track your miles.
We'll handle the meals.
Beyond muscle repair, protein plays a role in several other systems that matter for runners. It supports immune function, which takes a hit during heavy training blocks. It helps synthesize enzymes involved in energy metabolism. And it contributes to bone health – something endurance runners need to think about more than most, given the cumulative impact load of high mileage.
How Much Runners Actually Need
The general population guideline of 0.8 grams of protein per kilogram of body weight per day is not enough for runners. The research is consistent on this: endurance athletes need more, somewhere in the range of 1.4 to 1.7 grams per kilogram per day, and potentially higher during periods of heavy training or when running in a calorie deficit. [1] [2]
For a 70 kg runner, that's roughly 100 to 120 grams of protein per day. To put that in concrete terms: two eggs at breakfast (12g), Greek yogurt as a snack (15g), a chicken breast at lunch (35g), and a salmon fillet at dinner (35g) gets you close. It's achievable through normal eating, but only if you're paying some attention to it.
Most recreational runners undereat protein without realizing it, especially on high mileage days when appetite can be suppressed after hard efforts.
When You Eat It Matters Too
Total daily protein intake is the most important factor, but timing plays a supporting role. Your muscles are particularly receptive to protein in the hours after a run, when the repair process is most active. Eating a meaningful protein source within a couple of hours of finishing a hard session gives your body what it needs at the moment it's most ready to use it. [2]
How much protein you need per meal depends partly on age. For most runners, 20 to 40 grams per recovery meal is the effective range. For masters runners aged 40 and over, research is more specific: the anabolic response to protein becomes blunted with age, meaning older runners need a higher per-meal dose — around 35 to 40 grams post-workout — to stimulate the same muscle protein synthesis that 20 grams would achieve in a younger runner. If you are in your 40s or beyond, the lower end of that range is not enough after a hard session.
Spreading protein across multiple meals throughout the day is more effective than front-loading or back-loading regardless of age. A dinner with 80 grams of protein doesn't make up for a protein-light morning and afternoon.
Protein and Carbs Work Together
It's worth being clear about what protein doesn't do: it doesn't refuel your glycogen stores. Carbs do that. Protein and carbs have completely different jobs after a run, and one can't substitute for the other.
What they do together is complement each other. Research shows that combining protein with carbohydrates in your post-run meal is more effective for recovery than either alone. [3] The carbs restock the fuel. The protein starts the repair. A recovery meal that has both is more useful than one that has a lot of one and none of the other.
Real Food Sources Worth Knowing
You don't need protein shakes to hit your targets. Whole food protein sources come with additional nutrients that matter for runners – iron, omega-3s, zinc, B vitamins – that isolated protein powder doesn't provide.
Salmon and other fatty fish deliver both protein and omega-3 fatty acids, which have been shown to reduce inflammation markers after exercise. [4] Eggs are one of the most complete protein sources available, with a high absorption rate and easy preparation. Greek yogurt provides protein alongside calcium and probiotics. Legumes – lentils, chickpeas, black beans – offer plant-based protein with the bonus of carbohydrates for glycogen replenishment, making them genuinely useful recovery foods for runners who don't eat meat.
These meals cover the protein brief well after a run:
Salmon Poke Bowl
Pesto Chicken Pasta
Spinach & Egg Breakfast Wrap
The Quiet Gains
Protein rarely gets the credit it deserves because its effects are subtle and cumulative. You don't feel protein working the way you feel a well-fueled long run. But over weeks and months of consistent training, the runners who eat enough protein tend to recover faster between sessions, pick up fewer soft tissue injuries, and maintain their performance deeper into a training block.
It's not a magic variable. But it's one that a lot of recreational runners are quietly underdoing – and fixing it costs nothing except a bit more attention to what's on the plate after you run.
Every recovery recipe in Fuel.fit is built around a quality protein source paired with carbohydrates – because both matter, and neither works as well without the other.
Sources
[1] Rodriguez NR, Di Marco NM, Langley S. American College of Sports Medicine position stand: nutrition and athletic performance. Med Sci Sports Exerc. 2009;41(3):709-731.
[2] Jäger R, Kerksick CM, Campbell BI, et al. International Society of Sports Nutrition position stand: protein and exercise. J Int Soc Sports Nutr. 2017;14:20.
[3] Ivy JL, Goforth HW Jr, Damon BM, McCauley TR, Parsons EC, Price TB. Early postexercise muscle glycogen recovery is enhanced with a carbohydrate-protein supplement. J Appl Physiol. 2002;93(4):1337-1344.
[4] Rahimi MH, Nasir Y, Nouri Saeidlou S, et al. Effect of omega-3 fatty acids supplementation on inflammatory markers following exercise-induced muscle damage: systematic review and meta-analysis. Sci Sports. 2024;39(5-6):e167-e176.
