Additive Effect of Resistant Starch and Soluble-fiber Intake in Improving Postprandial Plasma Glucose and Insulin in Women

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Additive Effect of Resistant Starch and Soluble-fiber Intake in

Improving Postprandial Plasma Glucose and Insulin in Women

Reference: “Consumption of both resistant starch and beta-glucan

improves postprandial plasma glucose and insulin in women,” Behall KM,

Scholfield DJ, et al, Diabetes Care, 2006; 29(5): 976-81. (Address: Diet

& Human Performance Lab, Bldg 307B, Beltsville, MD 20705 USA. E-Mail:

behallk@... ).

Summary: In a Latin square design study involving 10 normal-weight (BMI

22 kg/m2; mean age 43.5 years) and 10 overweight women (BMI 30.4 kg/m2;

mean age 43.3 years), consumption of foods containing moderate amounts

of resistant starch and soluble fiber (beta-glucan) was found to improve

postprandial plasma glucose and insulin levels. The subjects consumed 10

tolerance meals in a Latin square design, where the meals (1g

carbohydrate/kg body wt) were glucose alone or muffins made with 3

levels of soluble fiber (0.26g, 0.68g, or 2.3g beta-glucan/100g muffin)

and 3 levels of resistant starch (0.71g, 2.57g, or 5.06g/100g muffin).

Plasma glucose levels were similar among overweight and normal-weight

women, but overweight women had higher plasma insulin concentrations,

and were somewhat more insulin resistant than normal-weight women.

Compared with glucose and insulin areas under the curve (AUCs) after

meals containing low beta-glucan and low resistant starch muffins,

postprandial glucose and insulin AUCs decreased by 17 and 33%,

respectively, when beta-glucan content was increased, and by 24 and 38%,

respectively, when resistant starch content was increased. The greatest

postprandial AUC reduction was a 33% reduction in glucose AUC and a 59%

reduction in insulin AUC after meals containing high beta-glucan and

high resistant starch. Thus, this study suggests that intake of

resistant starch and soluble fiber may have an additive effect in

improving postprandial plasma glucose and insulin in women.

--

ne Holden, MS, RD < fivestar@... >

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