Animal proteins are intrinsically more effective than plant proteins for preserving muscle mass with age, thus requiring an upward adjustment of plant-based portions to achieve equivalent results.

noli's read

The research cited, presented by Dr. Oliver Witard, suggests that at equal weights, plant-based proteins such as soy or wheat stimulate muscle protein synthesis less effectively, often due to a less complete amino acid profile or lower digestibility. It is an established physiological fact that leucine, an amino acid abundant in animal sources, is the key trigger for muscle building. The scientific community converges on the idea that plant sources require optimization (combining sources or increased quantities) to equal animal efficiency (meta-analysis, Journal of the International Society of Sports Nutrition). However, the debate on the forum correctly highlights a limitation: the actual risk of muscle loss in an active individual consuming sufficient plant-based protein remains poorly documented by long-term trials. The idea that plant-based diets are inherently dangerous is therefore an exaggerated extrapolation, as it is sufficient to adjust intake to compensate for the difference in efficiency. The forum consensus is divided: while users acknowledge the superiority of animal bioavailability, they vigorously debate the practical relevance of these discrepancies for a person already consuming a surplus of protein.

the sources

1. 1r/AdvancedFitness