Poster Topical Area: Aging and Chronic Disease
Poster Board Number: 149
Americans do not typically consume adequate fiber (Adequate Intake = 21-38 g/d). Lack of dietary fiber is related to gastrointestinal dysfunction (i.e. constipation) and impacts quality of life. Orange pomace is a byproduct of juice production that may be beneficial if consumed as a fiber source. Its impact on digestive health has not been determined.
Objective: The aim was to assess whether pomace will increase stool frequency (SF) in healthy adults.
Methods: In this randomized, double-blind, controlled trial, 221 adults (23 ± 0.5 y [mean ± SEM], 62% females) received a beverage containing pomace (473 mL or 16 oz/d providing 10 g fiber/d) or control beverage for 3 wk. Surveys assessed SF (number of stools/wk), Bristol stool score (BSS; weekly average of daily average scores), and Gastrointestinal Symptom Rating Scale scores. Automated Self-Administered 24-h diet recalls were completed once/wk during the intervention, and fiber was averaged per subject. Stool microbiota were analyzed by 16S rDNA sequencing and bifidobacteria (BIF) were quantified by qPCR.
Results: Average dietary fiber (g/d) excluding pomace did not differ between groups (15.5 ± 0.7 vs. 17.0 ± 0.9, P = 0.17). Including pomace, fiber intake was higher (26.4 ± 0.9, P < 0.0001). Mean weekly SF was higher in the pomace group (P = 0.0281) and increased from baseline with pomace (8.9 ± 0.4 vs. 9.6 ± 0.4 [LS mean ± SEM], P = 0.0003). This change was greater (P = 0.0443) than the non-significant difference between baseline and intervention in the control group. Pomace resulted in higher BSS during intervention vs. control (3.8 ± 0.1 vs. 3.6 ± 0.1, P = 0.0446). Indigestion syndrome scores were different due to participants reporting slight discomfort for symptoms of gas and bloating, confirming pomace fiber fermentation. Pomace did not alter BIF. Sequencing showed no phylum-level bacterial changes.
Conclusion: Orange pomace added fiber to the diet. SF was higher in those who consumed pomace. Pomace resulted in a small increase in stool softness (higher BSS, within typical range) and mild increases in gas and bloating, all of which indicate fiber fermentation. Intestinal BIF do not appear to mediate this mechanism. Orange pomace may benefit digestive health in healthy adults when consumed daily.
Food Science and Human Nutrition Department, University of Florida