|Das, Sai Krupa|
Submitted to: Obesity Research
Publication Type: Abstract Only
Publication Acceptance Date: 5/25/2005
Publication Date: 10/1/2005
Citation: Hajduk, C.L., Das, S., Saltzman, E., Bales, C.W., Mccrory, M., Kim, J., Golden, J., Pittas, A.G., Roberts, S.B. 2005. Effect of fiber on BMI, weight loss and satisfaction with food consumed during caloric restriction. Obesity Research. 13(Suppl):A141.
Technical Abstract: The effects of recommending a dietary fiber supplement on BMI, weight loss and satisfaction with amount of food during 48 wks of caloric restriction (CR) were studied in healthy overweight men and women (n=34, 26F/8M, Means+/-SD: 35+/-6y; BMI 27.6+/-1.4kg/m2) from a larger CR trial. After a 6-wk, weight-stable baseline (BL), subjects were randomized to either a low or high glycemic load diet (LG or HG) at 70% of ad lib intake, with food provided for 24 wks and self-selected for 24 wks. After 5 wks of CR, subjects were further randomized to receive either a 20g/d fiber supplement (+F) or no supplement (-F) for 6 wks. Outcome variables, measured during BL, the 6-wk fiber randomization (FR), and wks 12 and 24 of the self-selected phase (SS), were reported energy and fiber intakes, BMI, weight, hunger and satisfaction with amount of food measured by a 100mm scale. BL fiber intake was lower than DRI goals of 14g/1000kcals and did not differ between +F and -F (8.6+/-2.1, 8.0+/-1.7g/1000kcals). During FR, fiber intake in +F was 8.7g/1000kcals higher than -F (p<0.0001). Fiber intake went up significantly compared to BL in both +F and -F (14.2+/-0.9, 22.9+/-1.7g/1000kcals, p<0.0001) and during SS (15.1+/-2.8, 17.4+/-4.6g/1000kcals, p<0.0001) and was >/= DRIs throughout CR. During FR there were no significant differences in change in weight loss, hunger, or satisfaction with amount of food when comparing +F and -F in HG, LG or combined groups. However, at BL and SS, there was a significant positive relationship between fiber (g/day) and satisfaction with amount of food (r=0.44, p=0.02; r=0.49, p=0.05) and at SS, a significant negative association between fiber (g/d) and BMI (r=-0.33, p=0.04). While no statistically significant effect of added fiber above DRIs on short-term satisfaction with food intake or weight loss was found during the 6-wk FR, the long-term association of higher fiber with lower BMI and higher satisfaction with food intake indicates that current DRIs may facilitate maintenance of long-term CR.