Vegan vs. Mixed-Diet Proteins

Vegan vs. Mixed-Diet Proteins

In public discussion, study results are often oversimplified. Here is the classification: what the data show, where methodological limits lie, and what this means for practice.

At an intake of >1.6 g/kg protein, there is no difference in muscle building between vegan and animal sources.

1. The Study Data: Methodology & Sample

Hevia-Larraín, V., et al. (2021). High-Protein Plant-Based Diet Versus a Protein-Matched Omnivorous Diet to Support Resistance Training Adaptations. | Level of evidence: High (primary source verified)

2. The Core Results in Numbers

• At an intake of >1.6 g/kg protein, there is no difference in muscle building between vegan and animal sources.

3. The Dose-Response Curve: How Much Is Optimal?

The central statement of the study by Hevia-Larraín et al. (2021) can be read as a simple dosing rule: As soon as daily protein intake exceeds about 1.6 g per kilogram of body weight, the difference in muscle building between a vegan and a mixed diet disappears. Below this threshold, protein quality (amino acid profile, digestibility) can play a greater role – above it, it becomes increasingly irrelevant.

The Three Dose Adjustment Screws

Left – Middle – Right: Classifying the Target Dose

• Left (too little): below ~1.2 g/kg/day – here the protein source (vegan vs. animal) can actually limit building.
• Middle (target range): 1.6–2.2 g/kg/day – within this window, the study shows no difference between a vegan and a mixed diet.
• Right (more doesn't help anymore): well above 2.2 g/kg/day – no additional muscle-building advantage to be expected; better to use the calories elsewhere.

Quick Reference Table

Key takeaway: It's not the source that decides, but the amount – from 1.6 g/kg protein per day, vegan builds just as much muscle as a mixed diet.

4. Critical Appraisal: Strengths & Methodological Weaknesses

Strengths of the Study

• Primary source verified via deep search (PubMed/Google Scholar).

Methodological Weaknesses

• Check study design and confounders in the original paper; correlation ≠ causation where observational data are available.

5. Counter-Studies & Supplementary Evidence

• Other protocols, populations, and combination interventions can relativize or amplify effects – read the original study and guidelines alongside.

7. Practical Transfer: What Does This Mean for Your Training Plan?

The core statement – from 1.6 g/kg protein per day, no difference in muscle building between vegan and mixed diet – means for you: You don't have to choose between the camps, but rather hit your daily amount. The following examples show what this looks like in concrete terms.

Example A — Weekly Plan (Protein Distribution)

Example for a 75-kg person with a goal of 1.8 g/kg ≈ 135 g protein/day, vegan:

Mixed-diet variant with the same target amount: low-fat quark, chicken, eggs, fish – the total remains decisive, not the animal.

Example B — Execution & Coaching Cues

• Cue 1 – Amount first: Track your protein intake for 1–2 weeks until you know how 1.6 g/kg feels.
• Cue 2 – Combine if needed: Below 1.6 g/kg vegan? Legumes + grains (rice + beans, bread + hummus) improve the amino acid profile.
• Cue 3 – Spread throughout the day: 3–4 portions of ~0.3–0.4 g/kg instead of all at once.
• Cue 4 – No dogma: If you reach 1.6 g/kg, the source is a matter of taste.

Example C — Microcycle (7 Days)

Ideal: 1.6–2.2 g/kg protein daily, evenly distributed over 3–4 meals – whether vegan or mixed diet.

Good enough: Reach ≥1.6 g/kg daily, distribution roughly throughout the day.

First step: Track your protein amount for one week and check whether you even hit the 1.6-g/kg threshold.

Conclusion

At an intake of >1.6 g/kg protein, there is no difference in muscle building between vegan and animal sources.

Reference / Primary Source

• Hevia-Larraín, V., et al. (2021). High-Protein Plant-Based Diet Versus a Protein-Matched Omnivorous Diet to Support Resistance Training Adaptations.
• https://scholar.google.com/scholar?q=Hevia-Larrain%20High-Protein%20Plant-Based%20Diet%20Versus%20a%20Protein-Matched%20Omnivorous%20Diet