Which range defines 'active' as a physical activity factor category?

• A. 1.0 to less than 1.4
• B. 1.4 to less than 1.6
• C. 1.6 to less than 1.9
• D. 2.0 to less than 2.5

Answer: (C)

Activity factor is the multiplier used to scale energy needs from the basal level based on how much a person moves and exercises. The range 1.6 to less than 1.9 corresponds to being actively moving on a regular basis—think exercising several days a week or having a job that involves substantial physical activity. This indicates a higher level of daily movement than sedentary or lightly active patterns, so it increases estimated energy needs accordingly. It sits below the very active range (which is higher, typically around 2.0 and up) used for those with intense daily activity or training. So the 1.6 to less than 1.9 range best fits the label active.