Researchers at the Washington University School of Medicine in St. Louis studied how weekend behaviors affect weight loss.
The study involved 48 healthy adults aged 50 to 60 years. Prior to starting these programs all participants were found to consistently gain weight on weekends, but not weekdays! In fact, the average weekend weight gain would have led to an extra nine pounds over the course of one year.
The researchers divided the participants into 3 groups:
Group 1 (diet group) took in 20% fewer calories each day but didn't change their activity level.
Group 2 (exercise group) increased their daily exercise regimen but didn't change their diet, to have a comparable energy deficit as Group 1.
Group 3 (control group) did not change their diet or activity level.
What happened? During the year-long program both Group 1 and Group 2 did well during the week, however on weekends the diet group stopped losing weight and the exercise group gained weight due to higher calorie intake.
According to Susan B. Racette, PhD, assistant professor of physical therapy and medicine at the Washington University School of Medicine in St. Louis, "We thought weekends would present a problem for some people attempting to lose weight, but the consistency of our finding before and during the interventions was surprising. Subjects in the diet group lost weight during the week, but over the weekend, they stopped losing weight because they were eating more."
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