The problem is that there is no evidence that suggest standing in front of a computer screen helps at all in those situations as well. You're still stationary. You aren't moving. Moving your feet around below you to adjust the weight on your legs does nothing for your cardiovascular system.
Unfortunately, as people who are tied to their computer screens for most of the day, we have very few options. One is to exercise. My story is one of being in better health than I was when I was in a job moving around all day just to give some perspective to this topic.
there is no evidence that suggests standing in front of a computer screen helps
From the last of the three links I posted:
"They found that standing up engages muscles and promotes the distribution of lipase, which prompts the body to process fat and cholesterol, independent of the amount of time spent exercising. They also found that standing up uses blood glucose and may discourage the development of diabetes."
I apologize, I skimmed through that article too quickly.
Nevertheless, I will still hold my position that I was once "Fat", with high cholesterol and could barely hold my own body up. With what I have stated in my post, I am now healthy and can do things that most 20 year olds can not do. So, I guess it works for me pretty well.
Standing helps over sitting in a couple of very specific ways.
Notably, if you have a tendency toward tension in your hip flexor muscules, standing rather than sitting for a few hours a day will really help that. It's less of an artificially compressed position than sitting.
Unfortunately, as people who are tied to their computer screens for most of the day, we have very few options. One is to exercise. My story is one of being in better health than I was when I was in a job moving around all day just to give some perspective to this topic.