Extended Data Fig. 4: 4 Spearman correlations of 0–30 min delta changes in luminal carbohydrates with blood responses.

(A) Relationship between gastric glucose (mg/mL) and blood glucose (mmol/L), GIP(pg/mL), GLP-1 (pmol/L), and PYY (pmol/L). (B) Relationship between duodenal maltose (mg/mL) and blood glucose (mmol/L), GIP(pg/mL), GLP-1 (pmol/L), and PYY (pmol/L). (C) Relationship between duodenal glucose (mg/mL) and blood glucose (mmol/L), GIP(pg/mL), GLP-1 (pmol/L), and PYY (pmol/L). Two-sided Spearman correlation tests were used for scatterplots ABC. All scatterplots displayed individual points with a regression line representing the mean predicted values, and shaded bands representing 95% CI (n = 9). BldGlu, blood glucose; GasGlu, gastric glucose; DuoGlu, duodenal glucose; DuoMal, duodenal maltose.