The Claim
High-amylose japonica rice (Youtangdao 3) contains 8.15 times more resistant starch than high-amylose indica rice (Guangluai 4), despite identical amylose content, due to a higher amylose-to-amylopectin ratio and elevated protein content, particularly albumin and glutelin.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
Youtangdao 3 rice has 8.15 times more resistant starch than Guangluai 4 rice, even though both have the same amount of amylose, because Youtangdao 3 has a higher ratio of amylose to amylopectin and more albumin and glutelin proteins.
See the scientific wording
High-amylose japonica rice (Youtangdao 3) contains 8.15 times more resistant starch than high-amylose indica rice (Guangluai 4), despite identical amylose content, due to a higher amylose-to-amylopectin ratio and elevated protein content, particularly albumin and glutelin.
In rice grains with more amylose relative to amylopectin and higher levels of certain proteins, the starch forms tighter, harder-to-digest structures during cooling, and the proteins wrap around the starch like a shield, making it harder for digestive enzymes to break it down, so more starch passes through the gut undigested.
What the research says
1 studyEven though both rices have the same amount of amylose, the japonica rice has over eight times more resistant starch because it has more protein and a slightly different starch structure—like having more walls inside the grain that slow down digestion.
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.