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. 2009 Jun;32(6):1068-75.
doi: 10.2337/dc08-2280. Epub 2009 Feb 24.

Abdominal subcutaneous adipose tissue: a protective fat depot?

Stacy A Porter  1 , Joseph M Massaro, Udo Hoffmann, Ramachandran S Vasan, Christopher J O'Donnel, Caroline S Fox
Affiliations

Abdominal subcutaneous adipose tissue: a protective fat depot?

Stacy A Porter et al. Diabetes Care. 2009 Jun.

Abstract

Objective: Obesity is associated with increased metabolic and cardiovascular risk. The ectopic fat hypothesis suggests that subcutaneous fat may be protective, but this theory has yet to be fully explored.

Research design and methods: Participants from the Framingham Heart Study (n = 3,001, 48.5% women) were stratified by visceral adipose tissue (VAT) into sex-specific tertiles. Within these tertiles, age-adjusted abdominal subcutaneous adipose tissue (SAT) tertiles were examined in relation to cardiometabolic risk factors.

Results: In the lowest VAT tertile, risk factor prevalence was low, although systolic blood pressure in women and rates of high triglycerides, impaired fasting glucose, hypertension, and the metabolic syndrome in men increased with increasing SAT tertile (all P < 0.04). In contrast, in the top VAT tertile, lower triglycerides were observed in men with increasing SAT (64.4% high triglycerides in SAT tertile 1 vs. 52.7% in SAT tertile 3, P = 0.03). Similar observations were made for women, although results were not statistically significant (50.6% high triglycerides in SAT tertile 1 vs. 41.0% in tertile 3, P = 0.10). Results in the highest VAT tertile were notable for a lack of increase in the prevalence of low HDL in men and women and in rates of impaired fasting glucose in men with increasing subcutaneous fat, despite sizable differences in BMI across SAT tertiles (27.1 to 36.3 kg/m(2)[women]; 28.1 to 35.7 kg/m(2)[men]).

Conclusions: Although adiposity increases the absolute risk of metabolic and cardiovascular disease, abdominal subcutaneous fat is not associated with a linear increase in the prevalence of all risk factors among the obese, most notably, high triglycerides.

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Figures

Figure 1
Figure 1
Age-adjusted levels of risk factors by tertile of SAT in normal-weight (A and D), overweight (B and E), and obese (C and F) subjects. *P < 0.05, **P < 0.01, and ***P < 0.001 for linear trend across tertiles. DM, diabetes; HTN, hypertension; IFG, impaired fasting glucose; MetS, metabolic syndrome; TGs, triglycerides.
Figure 1
Figure 1
Age-adjusted levels of risk factors by tertile of SAT in normal-weight (A and D), overweight (B and E), and obese (C and F) subjects. *P < 0.05, **P < 0.01, and ***P < 0.001 for linear trend across tertiles. DM, diabetes; HTN, hypertension; IFG, impaired fasting glucose; MetS, metabolic syndrome; TGs, triglycerides.
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