(03-11-09) Inverse relation between dietary fiber intake and visceral adiposity in overweight Latino youth1,2,3

Jaimie N Davis, Katharine E Alexander, Emily E Ventura, Claudia M Toledo-Corral and Michael I Goran

1 From the Departments of Preventive Medicine (JND KEA EEV CMT-CMIG)PhysiologyBiophysics (MIG) Keck School of Medicine University of Southern California Los Angeles CA.
2 Supported by grant RO1 DK 59211 from the NIH and grant MO1 RR 00043 from the General Clinical Research Center, National Center for Research Resources.
3 Address correspondence to J Davis, 2250 Alcazar Street, Los Angeles, CA 90089-9008. E-mail: [email protected] .
Background: To date, no studies have assessed the longitudinal changes of dietary intake on metabolic risk factors in Latino youth.
Objective: We assessed the relation between changes in dietary intake, specifically sugar and fiber intakes, with changes in adiposity and risk factors for type 2 diabetes in a longitudinal analysis of overweight Latino youth.
Design: Overweight Latino youth (n = 85; aged 11?17 y) underwent the following measures over 2 y [mean (?SD) time difference was 1.5 ? 0.5 y]: dietary intake by 2-d diet recalls, body composition by dual-energy X-ray absorptiometry and magnetic resonance imaging, and glucose and insulin indexes by oral- and intravenous-glucose-tolerance tests. Partial correlations and repeated-measures analysis of covariance assessed the relation between changes in dietary intake with changes in adiposity and glucose and insulin indexes, independent of the following a priori covariates: sex, Tanner stage, time between visits, and baseline dietary and metabolic variables of interest.
Results: Increases in total dietary fiber (g/1000 kcal) and insoluble fiber (g/1000 kcal) were associated with decreases in visceral adipose tissue (VAT) (r = ?0.29, P = 0.02, and r = ?0.27, P = 0.03, for total dietary and insoluble fiber, respectively), independent of baseline covariates and change in subcutaneous abdominal adipose tissue. Participants who had decreased total dietary fiber (mean decrease of 3 g ? 1000 kcal?1 ? d?1) had significant increases in VAT compared with participants who had increased total dietary fiber (21% compared with ?4%; P = 0.02). No other changes in dietary variables were related to changes in adiposity or metabolic variables.
Conclusion: Small reductions in dietary fiber intake over 1?2 y can have profound effects on increasing visceral adiposity in a high-risk Latino youth population.

Source: American Journal of Clinical Nutrition, doi:10.3945/ajcn.2009.28133
Vol. 90, No. 5, 1160-1166, November 2009

News

---

In evidenza

"L'informazione presente nel sito serve a migliorare, e non a sostituire, il rapporto medico-paziente."

Per coloro che hanno problemi di salute si consiglia di consultare sempre il proprio medico curante.