Here’s how the Discussion section starts: “In this population-based
trial, participants were assigned to and taught about diets that
emphasized different contents of carbohydrates, fat, and protein and
were given reinforcement for 2 years through group and individual
sessions. The principal finding is that the diets were equally
successful in promoting clinically meaningful weight loss and the
maintenance of weight loss over the course of 2 years
. Satiety, hunger,
satisfaction with the diet, and attendance at group sessions were
similar for all diets. The diets improved lipid risk factors and fasting
insulin levels in the directions that would be expected on the basis of
macronutrient content. The study had a large sample, a high rate of
retention, and the sensitivity to detect small changes in weight. The
population was diverse with respect to age, income, and geography and
included a large percentage of men. The participants were eager to lose
weight and to attempt whatever type of diet they were assigned, and they
did well in screening interviews and questionnaires that evaluated their
motivation. Thus, the findings should be directly applicable to both
clinicians’ recommendations for weight loss in individual patients and
the development of population-wide recommendations by public health

Here’s another excerpt: “Study participants who attended two thirds of
the sessions over the course of 2 years lost about 9 kg of weight
Regain after 6 to 12 months was about 20% of the regain reported in
earlier trials.28 Several recent trials have also shown that continued
contact with participants after weight loss is associated with less
regain.12,24,37,38 These findings together point to behavioral factors
rather than macronutrient metabolism as the main influences on weight loss

The article is online at:>

Kaiser Permanente issued the following news release about a study
conducted at Duke University Medical Center, Pennington Biomedical
Research Center, Johns Hopkins University, and Kaiser:

Study finds keeping a food diary doubles diet weight loss