The Short-Term Effects of Strawberries on Postprandial Insulin Responses
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Insulin resistance is a known precursor to metabolic syndrome, cardiovascular disease and type II diabetes. Our lab has previously demonstrated that consumption of a strawberry treatment beverage with a high fat/carbohydrate (HFMC) meal attenuates plasma insulin and glucose concentrations in overweight, insulin resistant men and women. This study investigated the short-term effects of 10 g strawberries on postprandial insulin responses after a HFMC meal challenge in overweight and obese men and women. We hypothesized that consumption of 10 g of strawberries, in the form of a milk-based beverage, along with a HFMC meal would lower postprandial concentrations of insulin, glucose and triglycerides. Eight adults participated in the study. All participants consumed a test treatment drink (either a strawberry beverage or a placebo beverage) with the HFMC meal, in a single-blind cross-over design. Postprandial changes in insulin, glucose and triglyceride concentrations were assessed for 360 minutes. No significant differences were noted in end point concentrations between treatments. However, regardless of significance, the shapes of the strawberry treatment curves in all three metabolic measures were steadier and less erratic when compared with placebo treatment curves. This response is indicative of increased insulin sensitivity and improved ability to re-establish homeostasis. These results, though temporary, provide evidence to support the positive short-term effect of strawberry consumption on insulin responses, and suggest a role for strawberries in mitigating pre- and post- insulin resistant conditions in the future.