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  • Title: A randomized trial of a low fat high fibre diet in the recurrence of colorectal polyps. Toronto Polyp Prevention Group.
    Author: McKeown-Eyssen GE, Bright-See E, Bruce WR, Jazmaji V, Cohen LB, Pappas SC, Saibil FG.
    Journal: J Clin Epidemiol; 1994 May; 47(5):525-36. PubMed ID: 7730878.
    Abstract:
    After polypectomy for adenomatous colorectal polyps, 201 persons were randomized to receive counselling on a diet low in fat (the lesser of 50 g/day or 20% of energy) and high in fibre (50 g/day) (LFHF), or to follow a normal western diet (ND), high in fat and low in fibre. After 12 months of counselling, fat consumption was about 25% of energy in the LFHF group and 33% in the ND group; fibre consumption was 35 g and 16 g respectively. After an average of two years of follow-up, an intention to treat analysis led to a ratio of cumulative incidence rates of 1.2 (95% CL 0.6-2.2) for recurrence of neoplastic polyps, a finding which suggests no significant difference between dietary groups over the period of observation. An exploratory analysis conducted among 142 persons with substantial diet counselling indicated a reduced risk of neoplastic polyp recurrence in women (RR = 0.5), associated with reduced concentrations of faecal bile acids while on the LFHF diet, but indicated an increased risk of recurrence in men (RR = 2.1), associated with increased faecal bile acids. Although a larger study would be needed to rule out the role of chance, these findings of gender-specific associations between diet counselling and both faecal bile acid concentrations and recurrence of colorectal neoplasia are consistent with recently published evidence of differences between genders.
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