Original Article
European Journal of Clinical Nutrition (2006) 60, 949–954. doi:10.1038/sj.ejcn.1602404; published online 15 February 2006
Glucose and insulin responses in healthy women after intake of composite meals containing cod-, milk-, and soy protein
Guarantor: B Karlström.
Contributors: BV originally designed the study. MvP-S and BK performed the study and processed the material. MvP-S, BV, and BK all contributed to writing the paper.
M von Post-Skagegård1, B Vessby1 and B Karlström1
1Department of Public Health and Caring Sciences, Unit for Clinical Nutrition and Metabolism, Uppsala University, Uppsala, Sweden
Correspondence: M von Post-Skagegård, Department of Public Health and Caring Sciences, Unit for Clinical Nutrition and Metabolism, Uppsala Science Park, S-751 85 Uppsala, Sweden. E-mail: marie.vonpost@pubcare.uu.se
Received 30 December 2004; Revised 16 December 2005; Accepted 28 December 2005; Published online 15 February 2006.
Abstract
Objective:
To evaluate the metabolic effect of three different kinds of dietary proteins as part of composite meals with similar macronutrient composition in healthy subjects.
Design:
A randomised meal study.
Setting:
Metabolic ward.
Subjects and methods:
In total, 17 healthy women, 30–65 years old, consumed three meals in randomised order. The meals consisted of foodstuffs with similar nutrient composition but different types of protein (cod, cottage cheese, or soy protein isolate). The distribution of energy from protein, fat and carbohydrates was 33, 26, and 41 energy percent, respectively. Total amount of energy was 2300 kJ. Blood samples were drawn for assay of B-glucose, S-insulin, S-free fatty acids, S-triglycerides, and C-peptide in the fasting state and at seven times (20, 40, 60, 90, 120, 180, and 240 min) after starting to eat the test meal.
Results:
The blood glucose response after the cod protein meal differed from that of the soy protein meal, with a larger area under the curve (AUC) calculated up to 120 min. The serum insulin response after the milk protein meal differed from that of the cod protein meal with a larger AUC calculated up to 240 min. The insulin/C-peptide and the insulin/glucose ratios differed between the meals; the insulin/C-peptide ratio was higher after the milk protein meal compared to the cod, and soy protein meal at 120 min. The insulin/glucose ratio was lower after the cod protein meal compared to the milk, and soy protein meals at 120 min. The results showed that the metabolic responses differed after meals with similar macronutrient composition containing cod-, milk-, or soy protein.
Keywords:
amino acids, dietary protein, blood glucose, serum insulin
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