There are benefits to standing, for one is increased strength in the legs - just try it, it is a workout and you do burn more calories standing up than sitting down.
Increased cognitive ability is another benefit, due to the increased blood flow.
I think alternating is great, its what i tend to do.
1) Show me that study. Also, varicose veins suggest otherwise. Good muscle tone helps to prevent them. Apparently standing does not provide the right impulse.
Yes, you will burn slightly more calories but at what cost?
2) This is even more out there and suspicious claim. Varicose veins form out of impaired blood flow, not improved.
3) Do you mean situps? I heard they are an actual exercise.
The benefits of a standing desk are junk if taken on their own. Standing for extended periods is bad for you, just as is sitting all the time. Your calf muscles behave as a pump for getting blood back to your heart, so when all you do is stand, that pump isn't activated and blood will pool. Just ask people that need to stand for a living.
This isn't a simple solution: our bodies are meant to move, and extended sitting or standing isn't natural.
Increased cognitive ability is another benefit, due to the increased blood flow.
I think alternating is great, its what i tend to do.