The study, published in the August edition of the American Journal of Preventive Medicine, included 1,685 overweight or obese U.S. adults aged 25 and older.
For six months, they kept food diaries and were encouraged to eat a healthy diet and be physically active. They also met weekly in groups to share their food diaries and brush up on skills like how to judge portion size.
After six months, participants had shed almost 13 pounds, on average. The most powerful predictor of their weight loss was how many days per week they kept their food diary, says Victor Stevens, PhD, senior investigator at the Kaiser Permanente Center for Health Research in Portland, Ore.
Those who kept food records six days a week -- jotting down everything they ate and drank on those days -- lost about twice as much weight as those who kept food records one day a week or less, Stevens tells WebMD. Read the entire article.
The Four Pillars of Weight Loss