How much protein does a runner need per day?

Most runners need 1.4 to 1.7 grams of protein per kilogram of body weight per day during regular training. During heavy training blocks or when also managing weight loss, needs can reach 1.6 to 2.0 g/kg. A 70 kg runner in heavy training needs approximately 98 to 140 grams per day.

When should endurance athletes eat protein after a workout?

Within 30 to 60 minutes after a session is the standard recommendation, with 20 to 30 grams of protein combined with carbohydrates. This window supports both muscle repair and glycogen replenishment after long efforts.

Do endurance athletes need protein supplements?

Not necessarily. Protein needs can usually be met through whole foods for most athletes. Supplements like whey protein become useful when it is difficult to hit targets through food alone, or when a quick post-session protein source is needed during travel or tight schedules.

Protein Tracker · Needs

Protein for Endurance Athletes: How Much and When

Guide · 3 min read

Endurance sports are associated with carbohydrates, not protein. But endurance athletes have higher protein needs than sedentary people, and inadequate protein is one of the most common reasons for slow recovery, persistent fatigue and muscle loss in high-mileage training.

Quick answer: Endurance athletes typically need 1.4 to 1.7 grams of protein per kilogram of body weight per day, rising toward 1.6 to 2.0 g/kg during heavy training blocks or weight-loss phases. Timing matters: getting 20 to 30 grams within 30 to 60 minutes after a long session supports muscle repair and glycogen storage.

Why endurance athletes need more protein than they think

Long endurance sessions cause muscle protein breakdown as fuel and as a result of mechanical stress. The body also repairs micro-damage to muscle fibers after each session. Without adequate protein, this repair is incomplete, leaving cumulative damage that shows up as fatigue, soreness and reduced performance over training blocks.

How much protein endurance athletes need

Moderate training (3 to 5 hours per week): 1.2 to 1.4 g per kg of body weight per day.
Heavy training (8 to 15 hours per week): 1.4 to 1.7 g per kg per day.
Very high-volume or simultaneous caloric restriction: 1.6 to 2.0 g per kg per day.
Example: an 70 kg runner training 10 hours per week needs roughly 98 to 119 g of protein per day.

Timing: the post-session window

After a long run or ride, consuming protein with carbohydrates within 30 to 60 minutes accelerates both glycogen replenishment and muscle repair. A combination of fast-digesting protein (whey or dairy) with carbohydrates is the standard recovery strategy.

Target 20 to 30 grams of protein in the post-session meal.
Include carbohydrates to refuel glycogen stores alongside the protein.
For very long sessions (over 90 minutes), a small amount of protein during the session (10 to 15 g) can also help preserve muscle.

Distributing protein through the day

Protein synthesis is maximized by spreading intake across meals rather than concentrating it in one or two. Aim for three to five meals or snacks each containing 20 to 40 grams of protein. This matters especially on rest days when training stimulus is absent.

Best protein sources for endurance athletes

Lean proteins that are low in fat and easy to digest suit the high-carbohydrate needs of endurance training: chicken breast, fish, eggs, low-fat dairy, legumes and protein supplements when whole-food intake falls short. Plant-based athletes should ensure they combine sources to cover all essential amino acids.

Protein Tracker helps you log your daily protein intake across all meals and snacks. For more on hitting your daily target, see the guide to how to hit your protein goal.

Common questions

How much protein does a runner need per day?: Most runners need 1.4 to 1.7 grams of protein per kilogram of body weight per day during regular training. During heavy training blocks or when also managing weight loss, needs can reach 1.6 to 2.0 g/kg. A 70 kg runner in heavy training needs approximately 98 to 140 grams per day.
When should endurance athletes eat protein after a workout?: Within 30 to 60 minutes after a session is the standard recommendation, with 20 to 30 grams of protein combined with carbohydrates. This window supports both muscle repair and glycogen replenishment after long efforts.
Do endurance athletes need protein supplements?: Not necessarily. Protein needs can usually be met through whole foods for most athletes. Supplements like whey protein become useful when it is difficult to hit targets through food alone, or when a quick post-session protein source is needed during travel or tight schedules.

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