In a secondary analysis of the intention-to-treat weight loss data with last measured weight carried forward gave a highly significant diet group by time by gender interaction ( p = 0.002 ) with men doing better in the No Choice group overall ( maximum difference `` No Choice '' -2.94.6 kg vs. `` Choice '' -6.2 kg5 .3 kg at 6months ) and women doing better in the Choice group overall ( maximum difference Choice -3.13.7 kg vs. `` No Choice '' -2.0 kg2 .6 kg at 6months ) .