One possibly relevant consideration: people who are elderly and/or infirm often have to sit around a lot more, because they are physically incapable of moving a

One possibly relevant consideration: people who are elderly and/or infirm often have to sit around a lot more, because they are physically incapable of moving around as much. This may (or may not) account for some of the increased likelihood of death and other negative health effects. Another possibly relevant consideration: having an active job means moving around and doing something. Switching from sitting at a desk for hours to standing at a desk for hours may prove to be no more beneficial, because the critical component may be the moving around part. Not trying to be a parade rainer, but I'm always cautious about supposed breakthrough health trends, because there are many complicated interacting factors that make up someone's overall lifestyle and health factors. In the past, isolating a single factor (oat bran!) has rarely proved to be a panacea.