Three measures show high compliance in a soy intervention among premenopausal XXXX .

@entity1 @entity3093
OBJECTIVE: To evaluate adherence to a soy-based diet among premenopausal @entity1 . DESIGN: First year of a 2-year, randomized dietary intervention. SUBJECTS: 220 healthy premenopausal @entity1 who reported low baseline soy intake. INTERVENTION: 5 counseling visits, 7 follow-up phone calls, and 12 group meetings. Main outcome measures Self-reported soy intake logs; food frequency questionnaires; repeated, randomly timed 24-hour recalls; and analysis of urinary @entity3093 excretion by high-pressure liquid chromatography. Statistical analyses Frequency distributions, means, t tests, and mixed effects models. RESULTS: At baseline, the 2 groups did not differ in dietary soy intake (P=.51) or urinary @entity3093 excretion (P=.16). According to the 24-hour recalls and the food frequency questionnaires, the intervention group's estimated @entity3093 intake increased more than 10 times compared with baseline and with the control group (P<.0001). During follow-up, urinary @entity3093 excretion results showed no change in the control group, but a 6-fold increase for intervention subjects (P<.0001). Intake logs showed a strong preference for soymilk and tofu over the other foods and indicated that intervention @entity1 consumed at least 12 servings of soy foods per week during 84 out of 100 follow-up contacts. CONCLUSIONS: These data indicate a high level of compliance with the study regimen, which we attribute to the following strategies: repeated contact with the study subjects, personal relationships with the dietitians, wide choice of soy foods, easy access to soy foods at no cost, and recipes that allowed substitution of previously eaten foods with soy products.
