Glycaemic index of parboiled rice depends on the severity of processing: Study in type 2 diabetic subjects

  • Larsen H
  • Rasmussen O
  • Rasmussen P
 et al. 
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OBJECTIVE: To study the influence of parboiling and the severity of the process on glycaemic and insulinaemic responses to rice in type 2 diabetes. Moreover, to examine changes in starch structure related to parboiling, which may affect the metabolic responses and digestibility.

DESIGN: Nine type 2 diabetic subjects ingested four test meals: white bread (WB) and three meals of cooked polished rice of the same variety being non-parboiled (NP), mildly traditionally parboiled (TP) and severely pressure parboiled (PP). The participants ingested the test meals (50 g available carbohydrates) on separate occasions after an overnight fast.

SETTING: Outpatient clinic, Dept. Endocrinology and Metabolism, Aarhus University Hospital, Denmark.

RESULTS: All three rice samples elicited lower postprandial plasma glucose response (NP: 335+/-43; TP: 274+/-53; PP: 231+/-37 mmol/1*180 min.; means+/-s.e.m.) than white bread (626+/-80; P
CONCLUSIONS: All rice test meals were low-glycaemic in type 2 diabetic subjects. There was no effect of TP on glycaemic index, whereas PP reduced the glycaemic index by almost 30% compared to NP.

SPONSORSHIP: The Royal Veterinary and Agricultural University, Aarhus University Hospital, Danish International Development Assistance (DANIDA), Ministry of Foreign Affairs and the 'Konsul Johannes Fogh-Nielsens og Fru Ella Fogh-Nielsens Legat' foundation.

Author-supplied keywords

  • Amylose-lipid
  • Glucose
  • Glycaemic index
  • Insulin
  • Lipid complex
  • Parboiling
  • Rice
  • Type 2 diabetes

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