The Study
The impact of starchy food structure on postprandial glycemic response and appetite: a systematic review with meta-analysis of randomized crossover trials
This study looked at lots of small experiments where people ate different kinds of starchy foods like bread or pasta, and measured how their blood sugar reacted right after eating. It found that certain ways of preparing the food — like keeping it less cooked or more whole — made blood sugar rise less. But it didn’t test if this helps people avoid diabetes over years.
Analysis score
Maximum 100 for a systematic review with meta-analysis.
Where the score came from
This study looked at how the physical structure of starchy foods like bread, rice, and pasta affects blood sugar after eating.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 568 / 100
Quality score
The highest quality evidence. Systematic reviews and meta-analyses that pool randomized controlled trials, giving the most reliable summary of experimental evidence.
Key takeaways
Summary
Based on the study abstract and findings.
- 1These changes are meaningful—they’re like swapping white bread for cooled, whole-grain pasta and getting a noticeably smaller blood sugar spike, even if you eat the same amount of carbs.
- 2Foods with more amylose, less cooking, cooled after cooking, or bigger chunks lowered blood sugar by 0.43 to 0.81 units.
- 3But they didn’t make people feel fuller or change appetite hormones.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
The American Journal of Clinical Nutrition
Year
2021
Authors
Mingzhu Cai, Bowen Dou, Jennifer E. Pugh, Aaron M. Lett, G. Frost
Related Content
Videos (1)
Claims (10)
Some types of starch pass through the small intestine without being broken down, so no glucose is absorbed from them.
How the body reacts to rice depends on the specific structure of the starch molecules in the rice, not on the total amount of carbohydrates it contains.
Cooling and reheating cooked rice increases its resistant starch content more than two and a half times and lowers the rise in blood glucose and insulin after eating.
White rice with different starch structures leads to different rises in blood glucose and insulin after eating, even when the total amount of carbohydrates, protein, and fat is the same.
Cooling cooked starch increases its resistant starch content and lowers the blood glucose rise after eating.
Starchy foods with intact cell walls and larger particles cause lower increases in blood glucose and insulin after eating because their physical structure slows down enzyme breakdown of starch.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.