Research
Hormonal
Insoluble cereal fiber and resistant starch improve whole-body insulin sensitivity and reduce postprandial glucose, whereas soluble viscous fibers (like guar gum and psyllium) acutely lower glucose and insulin responses.
Incorporate both soluble viscous fibers (like psyllium, guar gum, oats) and insoluble cereal fibers (whole grains, legumes) into your diet. Soluble fibers can blunt the blood sugar spike of a meal, while insoluble fibers and resistant starch help improve your body's insulin sensitivity over time. Aim for 50g of fiber daily if tolerated.
GoodSupportsHIGH confidence
Insoluble cereal fibre is non viscous/gel-forming and therefore, do not directly influence GI. However, cereal fibre has been shown to improve whole-body insulin sensitivity... The randomized short-term trials clearly indicate that especially soluble fibres with viscous properties (e.g. glucomannan, guar gum, psyllium, β-glucan) exert acute improvements in glucose and insulin responses in individuals with T2DM
Why this rating
Based on multiple postprandial trials and longer-term interventions.
Source
Impact of Diet Composition on Blood Glucose Regulation
Wendy R. Russell et al. · Critical Reviews in Food Science and Nutrition · 2013
DOI 10.1080/10408398.2013.792772
narrative_reviewCited 256×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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- Physical food structure (e.g., intact kernels vs. flour) and processing methods (e.g., parboiling, cooling) significantly lower the Glycemic Index (GI) and postprandial glucose response compared to refined forms.Good
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