Abstract
Background:
Cross-sectional studies show that white adipose tissue hypertrophy (few, large adipocytes), in contrast to hyperplasia (many, small adipocytes), associates with insulin resistance and increased risk of developing type 2 diabetes. We investigated if baseline adipose cellularity could predict improvements in insulin sensitivity following weight loss.
Methods:
Plasma samples and subcutaneous abdominal adipose biopsies were examined in 100 overweight or obese individuals before and 10 weeks after a hypocaloric diet (7±3% weight loss) and in 61 obese subjects before and 2 years after gastric by-pass surgery (33±9% weight loss). The degree of adipose tissue hypertrophy or hyperplasia (termed the morphology value) in each individual was calculated on the basis of the relationship between fat cell volume and total fat mass. Insulin sensitivity was determined by homeostasis model assessment-estimated insulin resistance (HOMAIR).
Results:
In both cohorts at baseline, subjects with hypertrophy displayed significantly higher fasting plasma insulin and HOMAIR values than subjects with hyperplasia (P<0.0001), despite similar total fat mass. Plasma insulin and HOMAIR were normalized in both cohorts following weight loss. The improvement (delta insulin or delta HOMAIR) was more pronounced in individuals with hypertrophy, irrespective of whether adipose morphology was used as a continuous (P=0.0002–0.027) or nominal variable (P=0.002–0.047). Absolute adipocyte size associated (although weaker than morphology) with HOMAIR improvement only in the surgery cohort. Anthropometric measures at baseline (fat mass, body mass index, waist-to-hip ratio or waist circumference) showed no significant association with delta insulin or delta HOMAIR.
Conclusions:
In contrast to anthropometric variables or fat cell size, subcutaneous adipose morphology predicts improvement in insulin sensitivity following both moderate and pronounced weight loss in overweight/obese subjects.
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Acknowledgements
We are grateful for the excellent technical assistance of research nurses Britt-Marie Leijonhufvud, Katarina Hertel and Yvonne Widlund as well as laboratory technicians Eva Sjölin, Gaby Åström, Elisabeth Dungner and Kerstin Wåhlén. MR and PA conceived the study and wrote the first version of the manuscript, which was then read and approved by all co-authors. All authors contributed to subject recruitment and analyses. Mikael Rydén and Peter Arner are the guarantors of this work. This study was supported by grants from Swedish Research Council, Swedish Diabetes Association, Novo Nordisk Foundation, EASD/Eli-Lilly, The Erling-Persson Family Foundation, the EU/EFPIA Innovative Medicines Initiative Joint Undertaking (EMIF grant n° 115372) and the Diabetes Program at Karolinska Institutet.
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Eriksson-Hogling, D., Andersson, D., Bäckdahl, J. et al. Adipose tissue morphology predicts improved insulin sensitivity following moderate or pronounced weight loss. Int J Obes 39, 893–898 (2015). https://doi.org/10.1038/ijo.2015.18
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DOI: https://doi.org/10.1038/ijo.2015.18
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