Glycemic load effect on fasting and post-prandial serum glucose, insulin, IGF-1 and IGFBP-3 in a randomized, controlled feeding study

S S Runchey, M N Pollak, L M Valsta, G D Coronado, Y Schwarz, K L Breymeyer, C Wang, C-Y Wang, J W Lampe, M L Neuhouser, S S Runchey, M N Pollak, L M Valsta, G D Coronado, Y Schwarz, K L Breymeyer, C Wang, C-Y Wang, J W Lampe, M L Neuhouser

Abstract

Background/objectives: The effect of a low glycemic load (GL) diet on insulin-like growth factor-1 (IGF-1) concentration is still unknown but may contribute to lower chronic disease risk. We aimed to assess the impact of GL on concentrations of IGF-1 and IGF-binding protein-3 (IGFBP-3).

Subjects/methods: We conducted a randomized, controlled crossover feeding trial in 84 overweight obese and normal weight healthy individuals using two 28-day weight-maintaining high- and low-GL diets. Measures were fasting and post-prandial concentrations of insulin, glucose, IGF-1 and IGFBP-3. In all 80 participants completed the study and 20 participants completed post-prandial testing by consuming a test breakfast at the end of each feeding period. We used paired t-tests for diet component and linear mixed models for biomarker analyses.

Results: The 28-day low-GL diet led to 4% lower fasting concentrations of IGF-1 (10.6 ng/ml, P=0.04) and a 4% lower ratio of IGF-1/IGFBP-3 (0.24, P=0.01) compared with the high-GL diet. The low-GL test breakfast led to 43% and 27% lower mean post-prandial glucose and insulin responses, respectively; mean incremental areas under the curve for glucose and insulin, respectively, were 64.3±21.8 (mmol/l/240 min; P<0.01) and 2253±539 (μU/ml/240 min; P<0.01) lower following the low- compared with the high-GL test meal. There was no effect of GL on mean homeostasis model assessment for insulin resistance or on mean integrated post-prandial concentrations of glucose-adjusted insulin, IGF-1 or IGFBP-3. We did not observe modification of the dietary effect by adiposity.

Conclusions: Low-GL diets resulted in 43% and 27% lower post-prandial responses of glucose and insulin, respectively, and modestly lower fasting IGF-1 concentrations. Further intervention studies are needed to weigh the impact of dietary GL on risk for chronic disease.

Trial registration: ClinicalTrials.gov NCT00622661.

Conflict of interest statement

The authors have no conflicts of interest to disclose.

Figures

Figure 1
Figure 1
Mean (±SEM) concentrations of a) plasma glucose, b) plasma insulin, c) serum insulin-like growth factor-1 (IGF-1) and d) serum insulin-like growth factor-binding protein 3 (IGFBP-3) in 20 healthy lean and overweight-obese participants, who were fasting (time 0) and then consumed a high- (dotted lines and closed squares) or low- (thin line and open squares) glycemic load breakfast. The iAUC are significantly different for glucose and insulin and not significantly different for IGF-1 and IGFBP-3.

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