However, if the patient elects to maintain her current light daily activity level,
her daily energy-intake goal will reduce to 1,404 kcal/d for weight loss; and once she achieves her desired weight loss, she can maintain her 160 lb weight by consuming 2,154 kcal/d. The difference in energy needs after weight loss reflects the projected changes in body composition associated with changes in fat and lean mass, which vary according to amount of energy expended in physical activity and maintenance of lean body mass. Without more in-depth assessment of body composition, the Body Weight
Planner models the expected changes to lean and fat mass and concomitant BMR associated with reductions in energy intake and increases in physical activity.8 Precise modeling of both REE and the energy cost of physical-activity change in response to weight loss can make energy reduction and physical-activity targets for weight loss more accurate.12
The Body Weight Planner may also be used to elicit
patient goals with respect to dietary and physical-activity changes. Because reduc- tions in energy intake compared to increases in physical activity have different effects on the predicted rate of weight loss, patients can identify what changes are feasible given their lifestyle and have a more realistic understanding of how those
FIGURE 7.1 Sample use of the Body Weight Planner11
Reproduced from National Institute of Diabetes and Digestive and Kidney Diseases. Body Weight Planner. Accessed July 1, 2022. www . niddk . nih . gov / bwp.11