Abstract
Despite clear evidence that dietary fiber reduces development of diabetes and associated complications, many consume inadequate amounts. Additional dietary fiber, provided to people with pre-diabetes and T2DM and habitual low fiber intake, improved BMI and LDL cholesterol. However, a variable HbA1c response was observed: a reduction in those not taking Metformin and an increase in the small group using metformin alone. The interaction between metformin and supplemental fiber needs to be clarified and, in the meantime, used together with caution.