Results
There were 568 participants who completed an online screening questionnaire; 409 were excluded and 159 were randomized (77 to the vegan group and 82 to the omni group). Of the 159 participants (mean [SD] age, 48.4 [10.6] years; 126 female [79%]) who began the study, the main outcome of body weight was obtained for 121 participants (76%) at 12 months. There were no differences in outcomes between groups, including 12-month changes in weight (mean, –2.39 kg [95% CI, –3.48 to –1.30 kg] for the vegan group vs –2.03 kg [95% CI, –3.07 to –1.00 kg] for the omni group; 