The Claim
The combination of soy and wheat proteins in a plant-based sausage results in an 8% lower DIAAS score compared to wheat protein alone, indicating that blending these proteins without optimization of their ratio provides minimal improvement in amino acid completeness.
What the research says
Roughly balanced
Support and challenge are close. The picture may shift as more studies come in.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
A plant-based sausage made with both soy and wheat has only 8% better amino acid quality than one made with wheat alone, meaning combining them without adjusting their proportions does not significantly improve nutritional value.
See the scientific wording
The combination of soy and wheat in a plant-based sausage improved DIAAS by only 8% compared to wheat alone, suggesting that blending these proteins without optimizing their ratio provides minimal benefit for amino acid completeness.
Plant proteins like soy and wheat have complex structures that resist digestion, and they contain compounds that block enzymes from breaking them down. This prevents the body from absorbing enough of the essential amino acids, especially lysine in wheat and sulfur-containing amino acids in soy. Even when these proteins are mixed, the same barriers remain, so the total amount of usable amino acids barely improves.
What the research says
1 studyAdding soy to wheat sausage made its protein quality a little better—up from 33% to 41%—but it’s still pretty low in essential amino acids. So just mixing them doesn’t fix the problem.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.