The first priority in obesity treatment is to decrease calorie intake, usually by 500 to 1000 cal/day to achieve a weekly weight loss of 1 to 2 pounds (Seagle and Strain, 2009). This recommendation is based on the assumption that 1 pound of fat mass is approxi- mately equivalent to 3500 calories and that this rate of weight loss remains constant over a period of time. However, metabolic adaptations occur during weight loss (e.g., fewer calories expended during daily activities because body weight is lower) that require a further decrease in calorie intake to achieve a negative calorie balance and continued weight loss (Finkler, Heymsfield, and St-Onge, 2012). This is one factor that contrib- utes to the decreasing rate of weight loss that occurs as the duration of a diet increases (Finkler et al., 2012