How Much Protein Do Endurance Runners Need?

Distance runners often eat too little protein, partly out of legacy "carbs only" advice and partly because high mileage suppresses appetite. The newer research is clear: endurance training causes meaningful muscle damage and the protein required to repair it sits well above the 0.36g per lb US RDA.

The 2026 Consensus

Moore et al.'s 2014 work on endurance athletes and Phillips' 2017 review both place daily protein needs for trained runners at 1.2-1.7g per kg of body weight, or 0.55-0.77g per lb. The IOC consensus statement (2018) lists 1.2-2.0g/kg for endurance athletes depending on training load and goal (maintain vs build lean mass).

For practical purposes, two anchors:

• Base building / off-season: 0.55-0.65g per lb
• Peak marathon block / high mileage: 0.7-0.8g per lb

Why Runners Underfeed Protein

Three reasons. First, the legacy mantra "runners are carb athletes" framed protein as secondary. Second, long-run weeks suppress appetite, and what does survive tends to be high-carb (pasta, rice). Third, endurance gear culture sells gels and chews, not protein, so the marketing nudges toward carbs.

The cost is measurable. Under-protein-fed runners lose lean mass during heavy training blocks, get slower over time, and recover less between sessions. A 150 lb marathoner eating 60g protein per day (RDA) will likely lose lean tissue across a 16-week build.

Per-Workout Timing

Within 1-2 hours after a long run or hard interval session, eat 25-35g of high-quality protein with carbs. The carbs replenish glycogen; the protein triggers MPS and starts repairing damaged muscle. Skipping post-run protein is the single highest-cost mistake in endurance nutrition.

A typical pattern: long run finishes, you drink a recovery shake (whey + carb powder + milk = 30g protein + 60g carb), eat a proper meal within 90 minutes, and continue with normal protein-rich meals across the day.

Ultramarathon and Multi-Day Events

For 100+ mile races, protein during the event becomes meaningful. EAAs (essential amino acids) in 10-15g doses every 2-3 hours during the event can reduce muscle damage markers. Solid foods with embedded protein (jerky, cheese, hard-boiled eggs at aid stations) outperform pure-carb gels for events over 6 hours in many athletes.

Recovery between back-to-back race days requires 1.0-1.2g per lb if you want to perform on day 2.

Protein Shakes That Suit Runners

Whey concentrate is fine. Lactose-sensitive runners (and there are many; gut tolerance during high mileage can collapse) should consider isolate or plant. Orgain Organic Plant and Garden of Life Sport are common picks. For a budget isolate, Dymatize ISO 100 and Isopure are well-tolerated.

RTD shakes (Fairlife Core Power, Premier Protein) are popular as immediate post-run options because they require no mixing. See the protein drinks category for live pricing.

What About Iron and Other Nutrients?

This guide is protein-focused, but iron, B12, and vitamin D deficiencies are common in distance runners (especially women). Protein won't fix anemia. Get a blood panel each season if you train above 40 miles per week.

Sample Daily Template (150 lb Marathoner, Peak Block)

• Breakfast: oats + Greek yogurt + walnuts = 25g
• Mid-morning: 2 eggs on toast = 18g
• Lunch: chicken bowl with quinoa = 35g
• Post-run: whey shake with milk = 28g
• Dinner: salmon + sweet potato + greens = 30g
• Total: ~136g (0.91g per lb; close to peak block upper end)

For more on per-meal targeting, see our protein per meal explainer. For total daily math, see the main daily protein guide.