Cited by 28Food composition and propertiesDiabetes Management and ResearchDiabetes Treatment and Management

Influence of resistant starch resulting from the cooling of rice on postprandial glycemia in type 1 diabetes

Open access
Strozyk, Sylwia, Rogowicz-Frontczak, Anita, Pilacinski, Stanislaw, LeThanh-Blicharz, Joanna, Koperska, Anna, Zozulinska-Ziolkiewicz, Dorota·2022·Nutrition & Diabetes

Abstract

Introduction: Carbohydrates are one of the macronutrients which have the most substantial influence on glycemic response. The cooling of rice after cooking causes retrogradation of starch, which becomes a non-absorbable product in the human digestive tract. Aim of the study: This study aimed to assess whether cooling of rice affects postprandial glycemia in subjects with type 1 diabetes. Materials and methods: The study included 32 patients with type 1 diabetes. Each participant of the study consumed two standardized test meals consisting of long-grain white rice. One of the test meals was served immediately after preparation, and another was cooled for 24 h at 4 °C after preparation and reheated before being served. Postprandial glycemia was measured for 3 h using the FreeStyle Libre flash glucose monitoring system for each patient. Results: After consumption of the test meal containing rice subjected to the cooling process when compared to fresh rice, a significantly lower value of maximum glycemia (11 vs. 9.9 mmol/L,p = 0.0056), maximum glycemic increase (2.7 vs. 3.9 mmol/L,p < 0.0001), areas under the glycemic curve (135 vs. 336 mmol/L * 180 min,p < 0.0001) and significantly shorter time to peak (35 vs. 45 min,p = 0.031) was observed. There was a significantly higher number of hypoglycemic episodes among the patients after consuming test meals with cooled rice compared to fresh ones during 180 min of observation (12(38) vs. 3(9),p = 0.0039). Conclusions: Consumption of rice subjected to the cooling process results in a lower increase of postprandial blood glucose in subjects with type 1 diabetes. At the same time it increases the risk of postprandial hypoglycemia using a standard insulin dose.

AI snapshot

Written from the paper’s full text.

TL;DR

In a randomized, single-blind crossover study of 32 adults with type 1 diabetes, rice cooled for 24 h at 4 °C and reheated produced lower postprandial glycemia than freshly cooked rice. However, using the same insulin dose for both meals was associated with more postprandial hypoglycemia after the cooled rice.

Key findings

  • Cooled rice reduced maximum glycemia (9.9 vs. 11 mmol/L, p = 0.0056), maximum glycemic increase (2.7 vs. 3.9 mmol/L, p < 0.0001), and incremental AUC (135 vs. 336 mmol/L × 180 min, p < 0.0001), and shortened time to peak (35 vs. 45 min, p = 0.031).
  • Hypoglycemic episodes during 180 min were more frequent after cooled rice than fresh rice: 12 (38%) vs. 3 (9%), p = 0.0039.
  • Resistant starch content was higher in cooled/reheated rice than fresh rice: 11.96 ± 0.04 vs. 7.52 ± 0.05 g/100 g.
  • No significant differences were found in insulin dose for test meals, organoleptic assessment, or hunger, satiety, and desire to eat.

Methods

  • Randomized, single-blind crossover study in 32 patients with type 1 diabetes treated with personal insulin pumps; inclusion required age >18 years, BMI <30 kg/m², HbA1c <9%, and intensive insulin therapy.
  • Each participant consumed two standardized test meals of long-grain white rice: one freshly prepared and one cooked, cooled for 24 h at 4 °C, then reheated; meals contained 200 g rice plus 100 g tomato sauce (50 g carbohydrates total).
  • Postprandial glycemia was measured for 3 h with the FreeStyle Libre flash glucose monitoring system at 5-min intervals; insulin boluses were calculated by the pump bolus calculator, and analyses used Wilcoxon signed-rank and McNemar tests.

Limitations

  • The paper states that the FreeStyle Libre system was not patient-blinded, so patients could see glucose readings and potentially guess which test meal they were consuming; it suggests using patient-blinded continuous glucose monitoring in future studies.
  • The paper states that the same insulin dose was given for both meals regardless of cooling, and that repeating the test is needed to determine an appropriate insulin dose reduction for chilled rice to reduce postprandial hypoglycemia risk.
  • Evident from the text: the sample was small (n = 32), from a single center, with a short 180-min observation period, and the participants were relatively young, pump-treated, and well controlled (mean HbA1c 6.9 ± 0.6%, no chronic diabetes complications), which may limit generalizability.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.1038/s41387-022-00196-1

Cites

29 of 29 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Claims the paper makes

1 of 5 cited sources checked · 0 supported · 0 flagged · accuracy not yet measured

  • Findingown data

    In patients with type 1 diabetes, the number of hypoglycemic episodes during 180 min of observation was significantly higher after the test meal with cooled rice than after fresh rice (12 (38%) vs. 3 (9%), p = 0.0039).

    “There was a significantly higher number of hypoglycemic episodes among the patients after consuming test meals with cooled rice compared to fresh ones during 180 min of observation (12(38) vs. 3(9), p = 0.0039).”
    • Also stated in: § Hypoglycemic episodes · plain
      “The number of hypoglycemic episodes was significantly higher among the subjects after consuming a test meal with chilled rice than after consuming fresh rice during the observation period of 180 min (12 vs. 3, p = 0.0039)”
    Quote in the paperSubstantial claim
  • Findingown data

    There was no significant difference in the insulin dose administered for the test meals with fresh and cooled rice (5.4 (4.9-6.0) vs. 5.5 (5.0-6.1) units, p = 0.92).

    “There were no significant differences in the dose of insulin administered to test meals with fresh and cooled rice [5.4 (4.9–6.0) vs. 5.5 (5.0–6.1) units, p = 0.92].”
    Quote in the paperSubstantial claim
  • Findingown data

    The breakfast eaten before the test meals did not differ between the fresh-rice and cooled-rice conditions in energy, protein, fat, carbohydrate or fiber content.

    “The breakfast, which was the last meal eaten before the test meal for all the patients, did not differ between investigated groups in terms of energy value, protein, fat, carbohydrate, and fiber content.”
    Quote in the paperSubstantial claim
  • Findingown data

    There were no significant differences between the test meals with fresh and cooled rice in the sensation of hunger, satiety and desire to eat at 30, 60, 120 and 180 min after the meal.

    “No significant differences were observed in the study between test meals with fresh and cooled rice in terms of the sensation of hunger, satiety, and desire to eat 30, 60, 120, and 180 min after the meal.”
    Quote in the paperNot a substantial claim
  • Findingown data

    In patients with type 1 diabetes, the test meal with cooled rice produced a significantly lower maximum glycemic increase than the meal with fresh rice (2.7 vs. 3.9 mmol/L, p < 0.0001).

    “maximum glycemic increase (2.7 vs. 3.9 mmol/L, p < 0.0001)”
    • Also stated in: § Glucose response to test meals · plain
      “maximum glycemic increase [2.7(1.5–3.6) vs. 3.9(2.5–4.7) mmol/L, p < 0.0001]”
    Quote in the paperSubstantial claim
  • May combine two claims. 7
  • The quote only partly states this claim. 2
  • Classified as probably not a substantial claim. 9
  • May combine two claims.

    Interpretationcitation

    The shorter time to peak glycemia with chilled rice may improve glycemic control because the delayed glycemic peak may better coincide with the highest activity of short-acting insulin analogues.

    “This may help to improve glycemic control as the delayed glycemic peak may better cover with the highest activity of short-acting insulin analogues [26].”
    Quote in the paperNot a substantial claim1 of 1 sources checked
    • cites [26] Morello CM. Pharmacokinetics and pharmacodynamics of insulin analogs in special populations with type 2 diabetes mellitus. Int J Gen Med. 2011;4:827–35. source

      The Introduction (page unavailable) says rapid-acting insulin analogs provide better postprandial glucose control, supporting the general glycemic-control premise. It does not say that a delayed glycemic peak from chilled rice coincides with these analogs’ highest activity or improves control for that reason. It instead discusses delayed carbohydrate absorption in relation to regular human insulin. (LLM, conf=0.78)

      Experimental — accuracy not yet measured
  • May combine two claims. The quote only partly states this claim.

    Findingown data

    The resistant starch content of the test rice was 7.52 ± 0.05 g/100 g when freshly cooked and 11.96 ± 0.04 g/100 g after chilling and reheating.

    “The resistant starch content in the fresh and chilled test rice was 7.52 ± 0.05 and 11.96 ± 0.04 g/100 g, respectively.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Study design and conductnone given

    The clinical study was approved by the Bioethics Committee of Poznan University of Medical Science in Poland (ethical approval no. 198/18 1.02.2018).

    “The Bioethics Committee of Poznan University of Medical Science in Poland approved the clinical study (ethical approval no. 198/18 1.02.2018).”
    Quote in the paperNot a substantial claim
  • Classified as probably not a substantial claim.

    Study design and conductreasoning

    Patients were instructed to eat the same type of breakfast on all test days to minimize the effect of the first meal on the blood glucose value.

    “Patients were instructed to eat the same type of breakfast during all test days to minimize the effect of the first meal on the blood glucose value.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Study design and conductnone given

    A test meal was served only if the patient had no hypoglycemia within 24 h before the study and the pre-meal glucose was in the range 3.9-10 mmol/L.

    “A test meal on a test day could be served only if the patient had no episode of hypoglycemia within 24 h before the study. Before administering the test meal, the participant’s glucose target had to be in the range of 3.9–10 mmol/L.”
    Quote in the paperNot a substantial claim
  • Classified as probably not a substantial claim. May combine two claims.

    Study design and conductreasoning

    Before the study, each patient's basal rate was tested between 1 and 5 pm and modified under medical supervision if nonoptimal, to minimize the influence of the basal rate on blood glucose during the tests.

    “Before starting the study, to minimize the influence of the basal rate on blood glucose levels during the tests, each patient tested a basal rate between 1 and 5 pm.”
    Quote in the paperSubstantial claim
  • The quote only partly states this claim.

    Interpretationown data

    Cooling of rice does not affect the organoleptic assessment of a meal.

    “Cooling of rice does not affect the organoleptic assessment of a meal.”
    Quote in the paperSubstantial claim
  • Classified as probably not a substantial claim. May combine two claims.

    Study design and conductreasoning

    Patients were blinded to whether the meal consisted of freshly cooked or previously chilled rice, and the cooled meal was reheated to the same temperature as the fresh meal to ensure blindness.

    “The patient did not know if the meal consisted of freshly cooked rice or previously chilled. To ensure blindness, the previously cooled test meal was heated to the same temperature as the fresh meal.”
    Quote in the paperSubstantial claim
  • Classified as probably not a substantial claim.

    Study design and conductnone given

    The study was designed as a randomized, single-blind crossover study.

    “The study was designed as a randomized, single-blind crossover study.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Study design and conductnone given

    The FreeStyle Libre flash glucose monitoring system was applied at least 2 days before the first test meal.

    “FreeStyle Libre was applied at least 2 days before the first test meal.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Premisecitation

    Cooling cooked starch products produces resistant starch by retrogradation, and the crystallized starch form resists enzymatic degradation in the small intestine, lowering the concentration of digestible starch in cooked starch products.

    “The crystallized starch form can resist enzymatic degradation in the small intestine, thus lowering the concentration of digestible starch in cooked starch products [9, 10].”
    • Also stated in: § Introduction · plain
      “Cooling of cooked starch products decreases the content of available carbohydrates by producing resistant starch.”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites [9] Haralampu SG. Resistant starch: A review of the physical properties and biological impact of RS3. Carbohydr Polym. 2000;41:285–92. source
    • cites [10] Htoon A, Shrestha A, Flanagan B, Lopez-Rubio A, Bird AR, Gilbert EP, et al. Effects of processing high amylose maize starches under controlled conditions on structural organisation and amylase digestibility. Carbohyd Polym. 2009;75:236–45. source
  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Study design and conductnone given

    All analyses, except carbohydrate content, were performed in duplicate and the arithmetic means of the two values were used as the results.

    “All analyses, except carbohydrate content, were performed twofold. Arithmetic means of two valuesthat were obtained from the analysis were used as the results.”
    Quote in the paperNot a substantial claim
  • Classified as probably not a substantial claim.

    Study design and conductcitation

    Resistant starch content in the fresh and cooled test rice was analyzed using the AOAC 2002.02 method.

    “Resistant starch content was analyzed in fresh and cooled test rice (after reheating) using the AOAC 2002.02 method [18].”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [18] Horwitz W. Official Methods of Analysis (2007) 18th Ed., AOAC INTERNATIONAL, Gaithersburg, MD, Method 2002.02.

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

13 of 13
  • The authors state this as an assumption.

    For every 100 grams of chilled rice, the digestible carbohydrate content is reduced by about 5 grams compared to a freshly prepared product.

    “It can be assumed that for every 100 grams of chilled rice, the digestible carbohydrate content is reduced by about 5 grams compared to a freshly prepared product.”
  • The paper relies on this without support.

    There are no scientific reports on the effect of retrograded (cooled) starch on postprandial glycemia in people with type 1 diabetes.

    “There are no scientific reports on the effect of retrograded starch on postprandial glycemia in people with type 1 diabetes.”
2 of 2

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

Each contradiction between two passages listed here was confirmed by an independent check.

  • Abstract reverses the maximum-glycemia values

    Minor

    The abstract introduces the comparison as cooled rice versus fresh rice but lists maximum glycemia as 11 versus 9.9 mmol/L. Table 2 assigns 11 to fresh rice and 9.9 to cooled rice, so the abstract's value order contradicts its claim of a lower maximum after cooled rice.

  • Discussion describes an earlier peak as delayed

    Minor

    The discussion says chilled rice produced a shorter time to peak than fresh rice, then attributes the potential benefit to a delayed glycemic peak. A shorter time to peak is an earlier, not a delayed, peak relative to fresh rice.

2 of 2

Cites

Flagged first, then by citations

Research works printed but not linked: 2

  1. Dewi AP, Isnawati M. Effects of freshly cooked white rice and yesterday (retrograded) white rice on postprandial blood glucose levels in prediabetic female subjects. JNC. 2013;2:411–8.
  2. Skotnicka M, Duraj N. The role of nutrients in the regulation of body satiety. Ann Acad MedGdan. 2015;45:79–87.

Cited by

Sorted by citations

Authors
Strozyk, S., Rogowicz-Frontczak, A., Pilacinski, S., LeThanh-Blicharz, J., Koperska, A., & Zozulinska-Ziolkiewicz, D.
Affiliations
Poznan University of Medical Sciences (PL)
Corresponding author
Strozyk, Sylwia
Venue
Nutrition & Diabetes
Published
2022-04-16
Volume
12
Issue
1
Pages
21-21
ISSN
2044-4052 (ISSN-L)
OpenAlex
W4224085482
Cited by
28
References
29
Citations by year
2026: 8 · 2025: 3 · 2024: 9 · 2023: 6 · 2022: 2
FWCI
2.54
Type
journal article
Language
en
Open access
Locations
  • Nutrition and Diabetes (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • PubMed Central (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
Abbott Diabetes Care
Topics
  • Health Sciences › Nursing › Nutrition and Dietetics › Food composition and properties
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Management and Research
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Treatment and Management
Keywords
resistant starch, rice, starch retrogradation, postprandial blood glucose, type 1 diabetes, postprandial hypoglycemia, flash glucose monitoring, insulin dose
MeSH terms
Resistant Starch, Blood Glucose, Diabetes Mellitus, Type 1, Humans, Insulin, Oryza, Blood Glucose Self-Monitoring, Cross-Over Studies, Postprandial Period, Glycemic Index, Meals

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