The Claim
Among four soy-based products—soymilk, reconstituted soymilk powder, firm tofu, and yuba—firm tofu exhibits the highest in vitro gastrointestinal protein digestibility (41.0 ± 1.6 mmol/g protein), followed by reconstituted soymilk powder (38.1 ± 0.6 mmol/g protein), yuba (36.0 ± 0.1 mmol/g protein), and soymilk (29.9 ± 0.6 mmol/g protein), and processing methods that alter protein aggregation and microstructure significantly influence protein bioaccessibility under simulated human digestion conditions.
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.
Firm tofu releases more digestible protein than soymilk, reconstituted soymilk powder, or yuba when tested in a lab system simulating human digestion, and differences in how these products are processed affect how much protein becomes accessible.
See the scientific wording
Among four soy-based products—soymilk, reconstituted soymilk powder, firm tofu, and yuba—firm tofu exhibited the highest in vitro gastrointestinal protein digestibility (41.0 ± 1.6 mmol/g protein), followed by reconstituted soymilk powder (38.1 ± 0.6 mmol/g protein), yuba (36.0 ± 0.1 mmol/g protein), and soymilk (29.9 ± 0.6 mmol/g protein), indicating that processing methods altering protein aggregation and microstructure significantly influence protein bioaccessibility under simulated human digestion conditions.
When soy is processed into firm tofu or powdered soymilk, the proteins form loose clusters held together by weak bonds that break apart easily in the stomach and intestines, letting digestive enzymes reach and break down the proteins. When soy is processed into soymilk or yuba, the proteins lock into tight, rigid structures with strong chemical bonds and form large clumps that shield the proteins inside, making it hard for enzymes to reach and break them down.
What the research says
1 studyIn a lab test that mimics human digestion, firm tofu broke down into usable protein more than the other soy foods, and the study shows this is because how soy is processed changes its protein structure—making some forms easier for the body to digest than others.
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.