The simple — and free — act of keeping a food diary can double a person’s weight loss, according to a study from Kaiser Permanente’s Center for Health Research in Portland, Oregon. The findings, from one of the largest and longest-running weight-loss-maintenance trials ever conducted, were published in the American Journal of Preventive Medicine.
Funded by the National Heart, Lung and Blood Institute at the National Institutes of Health, this study is one of the few to recruit a large percentage of African Americans as participants (44 percent). According to the researchers, African Americans have a higher-than-average risk of conditions that are aggravated by being overweight, including diabetes and heart disease.
"The more food records people kept, the more weight they lost," says lead author Jack Hollis, Ph.D. "Those who kept daily food records lost twice as much weight as those who kept no records. It seems that the simple act of writing down what you eat encourages people to consume fewer calories."