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Diabetic Medicine
Year: 2008  |  Volume: 25  |  Issue: 5  |  Page No.: 597 - 605

Impact of 3-year lifestyle intervention on postprandial glucose metabolism: the SLIM study

C. Roumen, E. Corpeleijn, E. J. M. Feskens, M. Mensink, W. H. M. Saris and E. E. Blaak    


Objective To determine the effect of a 3-year diet and exercise lifestyle intervention, based on general public health recommendations, on glucose tolerance, insulin resistance and metabolic cardiovascular risk factors in Dutch subjects with impaired glucose tolerance (IGT).

Methods The study was a randomized controlled lifestyle intervention over 3years. A total of 147 IGT subjects (75 male, 72 female) were randomized to the intervention (INT) group or control (CON) group; 106 subjects (52 INT, 54 CON) completed 3years of intervention. Annually, glucose, insulin and free fatty acid (FFA) concentrations were determined fasting and after an oral glucose tolerance test. Measurements of body weight, serum lipids, blood pressure and maximal aerobic capacity were also performed.

Results Analysis of those who completed the 3-year trial, showed that the lifestyle intervention improved body weight (INT −1.08±4.30kg; CON +0.16±4.91kg, P=0.01), homeostatis model assessment index for insulin resistance and 2-h FFA. Two-hour glucose concentrations improved in the INT group, the difference being most pronounced after 1year, with a return to baseline values after 3years, from 8.59±1.55 to 8.55±0.34mM; in contrast, 2-h glucose deteriorated in the CON group—from 8.46±1.84 to 9.35±2.50mM (P=0.02). In the INT group, diabetes incidence was reduced by 58% (P=0.025).

Conclusion Our lifestyle intervention showed a sustained beneficial effect on 2-h glucose concentrations, insulin resistance and 2-h FFA, even after 3years. Our lifestyle intervention is effective, but for implementation more information is needed about factors influencing adherence.

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