The article abstract has more detail. http://archinte.jamanetwork.com/mobile/article.aspx?articleid=2517920 http://archinte.jamanetwork.com/mobile/article.aspx?

The article abstract has more detail. http://archinte.jamanetwork.com/mobile/article.aspx?articleid=2517920 http://archinte.jamanetwork.com/mobile/article.aspx?articlei... The people involved were in the upper range for healthy BMI or into the overweight range. It's not surprising healthier weight makes people happier. This doesn't mean that people of low/medium healthy BMI would be happier on a calorie restrictive diet. It would be interesting to know what the BMI range was at the end of the study. Did they just get people into the low/medium healthy range or did they dip lower than that? More importantly, though, how did they get people to stick with a 25% calorie reduction for 2 years? That's like the holy grail for weight loss research. Almost no one stays with a diet long term.