Sitting for long periods of the day increases risks for major disease.
Do height-adjustable workstations actually encourage people to stand more, and does standing translate to reduced risks? A review of five small studies comparing employees who used height-adjustable desks with those who did not failed to find any differences. The authors stated standing might be only marginally better than sitting and moderate to vigorous purposeful exercise could be more useful.
PositiveTip: Instead of sitting all day, go for a short walk several times per day!