Do complementary plant proteins enhance muscle protein synthesis? 🌱🔍
Important info for plant-based athletes.
Complementary plant protein pairing does not further increase post-exercise myofibrillar protein synthesis after a 20 g protein dose within a high-carbohydrate whole-food matrix in young adults: a randomized controlled trial
Study Details
This new study recruited physically active young adults to consume either…
🍽️ Beans + rice meal (20 g protein, 114 g carbohydrate) (COMP)
🥤 An isolated nutrient drink containing the exact same amino acids, carbohydrate, fat and fibre as the meal (ISO)
…immediately after resistance exercise 🏋️♂️
Muscle protein synthesis responses were analysed during the recovery period 📈
Key Findings
📈 Both COMP and ISO increased muscle protein synthesis above baseline but did not differ between conditions
⚠️ Despite containing 20g protein, plasma amino acids fell during the recovery period in both conditions
📉 Leucine concentrations were also lower in the COMP vs ISO condition
🚨 Indicating that the whole-food matrix, fibre content and large carbohydrate load may have slowed digestion and reduced amino acid availability
In exploratory analysis, pork protein significantly outperformed both plant proteins conditions (by almost double) 🍖
Conclusion
The findings do not suggest plant-based diets cannot support muscle growth 👈
Rather, they suggest that a modest 20 g whole-food plant meal may not be enough to optimise post-exercise anabolic responses ⚠️
For those following plant-based diets, focusing on total protein intake and leucine-rich protein sources is likely more important than simply combining complementary proteins ✅
Reference
https://ajcn.nutrition.org/article/S0002-9165(26)00189-9/fulltext
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