then why are they comparing the results of people on both plans who consume the same amount of calories? Doesn't that negate the whole claimed advantage of the "eat often" plan: that appetite will be controlled and fewer calories will ultimately be consumed.
Plus, I think the effectiveness of a weight loss plan has to also consider how much effort it takes for people to stay on the plan. Real life dieters are not going to behave like monitored test subjects...so if the appetite is controlled by eating often, it will be easier for those dieters to stay on the plan.
A better test would be to give different dieting instructions to two samples of people who don't even know they are part of a study, and then measure their weight loss after a lengthy period of time. That would tell you which plan is more effective in real life.