From Calories Burned Standing Vs. Sitting | LIVESTRONG.COM:
Author Neville Owen, who surveyed multiple studies on the effects of sedentary lifestyles, concluded that an increasingly sedentary lifestyle contributes to the growing rates of type 2 diabetes, cardiovascular disease and obesity in the United States, United Kingdom and Australia. His conclusions, published in a 2008 edition of the “British Journal of Sports Medicine,” recommends possible interventions to break up people’s daily sitting time as part of public health practice.
This article from Livestrong.com says that for every hour you spend standing instead of sitting, you burn around 50 more calories. That might not seem like much, but it adds up; if I spend 6 hours out of my day standing at my desk, that’s 300 calories burned with no extra effort or time commitment.
I’m enjoying my choice to stand throughout the workday more and more.