My understanding of the original meaning was to have people not focus on weight loss but to focus on healthy choices.  This included small portions, nutritionally dense foods, higher activity levels, etc.  These were the goals and weightless was kind of an intended side effect.  Not a focused goal.  Sounds reasonable enough.  Focus on healthy choices, not your weight.  And enough healthy choices will, as an inevitable side effect, she'd weight. Then it got co-opted by the FA movement who kept it in name only to mean that being fat IS healthy.