The group treatment sessions were 75 to 90 minutes and
were held weekly from weeks 1 to 20, every other week from
weeks 21 to 40, and every 8 weeks from weeks 41 to 104. Groups
included 8 to 12 participants and only contained persons assigned
to the same diet condition (low-carbohydrate or low-fat).
Once the group sessions began, no additional members were
added, and participants could not attend other group sessions.