Protein for vegan athletes

Vegan athletes can build muscle, recover, and compete at high levels. In controlled resistance-training trials, plant-based and omnivorous athletes achieve equivalent strength and muscle gains when total protein intake is matched (Hevia-Larraín et al., 2021). A 2024 meta-analysis of 10 RCTs found no significant effect of plant-based diets on strength or power performance (d = −0.30, 95% CI: −0.67–0.07), and a moderate positive effect on aerobic performance (Damasceno et al., 2024). The limiting factor is not biology — it is planning.

Survey data shows vegan athletes average roughly 63 g protein per day versus approximately 89 g for omnivores (West et al., 2023). Most are not reaching the lower end of athletic protein targets. That is a logistics problem, not a biological ceiling.

The tl;dr

• Target: 1.6–2.0 g/kg/day for most athletes; 1.7–2.2 g/kg during concurrent training; 2.3–3.1 g/kg FFM during a caloric deficit (Helms et al., 2014).
• Best plant sources: soy protein and pea-rice blends — both match dairy for muscle mass outcomes in RCT synthesis.
• Leucine per serving: plant proteins vary in leucine density. Soy and pea are the most leucine-dense common plant sources; wheat is notably lower. Standard 25 g supplement scoops typically fall short of the ~2.7 g threshold — serving sizes need calibrating.
• Creatine: vegan athletes start with lower baseline muscle creatine; supplementation produces a supercompensation effect larger than the same protocol in omnivores (Kaviani et al., 2020).

How much protein vegan athletes actually need

The International Society of Sports Nutrition recommends 1.4–2.0 g/kg/day for active individuals (Jäger et al., 2017). West et al. (2023) — the most comprehensive vegan-athlete nutrition review currently available — stratify that range by training type:

Training type	Target (g/kg/day)
Endurance	1.2–1.6
Resistance	1.6 or above
Concurrent (strength + endurance)	1.7–2.2
Caloric deficit	2.3–3.1 (per kg FFM)

(West et al., 2023 for training-type ranges; Helms et al., 2014 for deficit)

Vegan athletes should aim for the upper end of each range, not the midpoint. Many plant proteins have lower true ileal digestibility than animal proteins — roughly 80–89% versus 90–95% for animal sources (Mariotti & Gardner, 2019). Slightly more protein from quality sources closes that gap at practical calorie intakes without requiring exotic foods or extreme volumes.

Aerobic and strength performance: what the trials show

Damasceno et al. (2024) synthesized 10 RCTs with 293 participants comparing plant-based and omnivorous athletes. The findings split clearly by modality.

Strength and power: no significant difference (d = −0.30, 95% CI: −0.67–0.07). Plant-based diets do not compromise force or power output.

Aerobic performance: a moderate positive effect for plant-based athletes (d = 0.55, 95% CI: 0.29–0.81). This advantage is real but the mechanism is not fully established. Plant-based athletes in these trials also tended toward lower BMI and broader health-conscious co-behaviors — both of which independently benefit aerobic capacity. The aerobic edge should be read as genuine but partly reflecting lower BMI and those co-behaviors, not established dietary causation (Damasceno et al., 2024).

The protein-controlled RCT by Hevia-Larraín et al. (2021) directly tests the most common concern: they matched protein intake between habitual vegans and omnivores across a resistance-training program and found equivalent gains in muscle mass and strength. This is a single RCT and needs replication, but it answers the core question — when quantity is equalized, no gap appears (Hevia-Larraín et al., 2021).

Muscle mass: soy versus non-soy plant proteins

Reid-McCann et al. (2025) conducted the most current RCT-level synthesis on plant versus animal protein across muscle mass, strength, and physical performance. The headline number: overall, plant protein shows a small but statistically significant disadvantage for muscle mass (SMD = −0.20, P = 0.02). That is a small effect, but it is real and should not be dismissed as “no difference.”

The critical detail is the source breakdown. When the analysis isolates soy versus dairy protein, the gap disappears: SMD = −0.02 (95% CI: −0.20–0.16), which is not statistically significant (Reid-McCann et al., 2025). The small overall edge to animal protein is driven almost entirely by non-soy plant protein sources.

For athletes targeting hypertrophy, this translates clearly: soy is the most RCT-validated plant protein, matching dairy in muscle mass outcomes. Pea-rice blends, fortified with leucine, are a strong secondary option. Non-soy sources like wheat gluten require higher quantities to compensate for their lower leucine density and digestibility.

Leucine and the anabolic threshold

Approximately 2.7 g of leucine per meal is the commonly cited threshold for maximally stimulating muscle protein synthesis signaling. Plant proteins vary considerably in leucine density: soy and pea rank highest among common plant sources, while wheat protein contains notably less leucine per gram. In practice, a standard 25 g scoop of most plant protein powders falls short of the ~2.7 g threshold — athletes using plant protein powders should size servings against leucine content, not the default label suggestion.

Creatine: the supplement with the clearest case

Vegan and vegetarian athletes have consistently lower baseline muscle creatine concentrations than omnivores because dietary creatine comes primarily from meat. That lower starting point matters: creatine loading in vegetarians produces supercompensation increases in lean mass, type II fiber cross-sectional area, strength, and muscular endurance that exceed the effect seen in omnivores given the same protocol (Kaviani et al., 2020). The systematic review by Kaviani et al. draws on mixed RCT evidence, but the direction and magnitude of the advantage are consistent.

Supplemental creatine is synthesized from non-animal precursors — sarcosine and cyanamide — and contains no animal-derived material. It is classified as vegan-friendly. Standard protocol: 20 g/day split across four doses for 5–7 days loading, then 3–5 g/day maintenance (Rogerson, 2017).

Practical guidance

• Lead with soy. Tofu, tempeh, edamame, and soy isolate match dairy for muscle mass outcomes and are the most RCT-validated plant protein for athletes.
• Use pea-rice blends as backup. They complement soy well and provide a complete amino acid profile at adequate serving sizes.
• Size servings against leucine, not the label. Standard plant protein scoops (20–25 g) typically fall short of the ~2.7 g leucine threshold. Soy and pea require larger servings than label defaults; wheat requires more still due to lower leucine density.
• Add creatine. Load at 20 g/day for 5–7 days, maintain at 3–5 g/day. The evidence is consistent and the benefit for vegan athletes is greater than for omnivores (Kaviani et al., 2020).
• Track total daily protein until you know your intake. Survey data suggests most vegan athletes fall short — not because the foods do not exist, but because portions have not been calibrated (West et al., 2023).
• Consider beta-alanine (4–6 g/day for 2–4 weeks) for high-intensity efforts lasting more than one minute; evidence is moderate but consistent (Rogerson, 2017).

Common misconceptions

• “You can’t build serious muscle on a vegan diet.” When protein intake is matched by quantity, vegan and omnivore athletes achieve statistically equivalent strength and muscle gains. The real-world gap is almost always a quantity problem, not a biological barrier (Hevia-Larraín et al., 2021).

• “Plant protein is too low in leucine to stimulate muscle synthesis.” Lower leucine density means serving sizes need to be larger — not that the threshold is unreachable. Soy and pea protein are the most leucine-dense plant options; both can meet the ~2.7 g threshold at adequate serving sizes — standard 25 g scoops typically fall short.

• “Plant-based diets hurt endurance performance.” Current meta-analysis data show the opposite: a moderate positive aerobic effect. Part of this reflects lower BMI and health-conscious co-behaviors in plant-based athletes, but the aerobic detriment many assume does not appear in the evidence (Damasceno et al., 2024).

• “Creatine is an animal product.” Supplemental creatine is chemically synthesized from non-animal inputs and contains no animal-derived material. Vegan athletes stand to gain more from it than omnivores because their baseline stores are lower (Kaviani et al., 2020).

• “Protein targets are the same for vegans and omnivores.” Not quite. Lower plant protein digestibility justifies targeting the upper end of evidence-based ranges — 1.6–2.0 g/kg/day rather than the omnivore midpoint of roughly 1.4–1.6 g/kg (West et al., 2023).

• “Soy matches animal protein, so any plant protein will too.” The soy-versus-dairy equivalence is well-supported; the overall plant-versus-animal comparison is not. The small muscle mass gap driven by non-soy proteins is real and statistically significant — source quality matters (Reid-McCann et al., 2025).

The punchline

The evidence for plant-based athletic performance is solid. Vegan athletes match omnivores for strength when protein quantity is equalized; the small overall muscle mass gap disappears when soy replaces non-soy plant proteins; and a moderate aerobic advantage appears in meta-analysis data, though its mechanism involves factors beyond diet alone. There is no biological ceiling.

What the data consistently flag is a planning gap. Most vegan athletes eat substantially less protein than athletic targets require — a logistics problem, not a physiology problem. Hit 1.6–2.0 g/kg daily, build your protein base around soy and pea-rice blends, check serving sizes against the leucine threshold, and add creatine. The broader framework lives in the protein pillar; this article handles the athlete case.