I'd counter argue that the common negative health effects of sitting down far outweigh the common health effects of varicose veins (from that wiki):
"Most varicose veins are relatively benign, but severe varicosities can lead to major complications, due to the poor circulation through the affected limb."
I think the positive evidence for standing versus sitting is overwhelming to put it lightly.
"This isn't actually a new discovery. In a British study published in 1953, scientists examined two groups of workers: bus drivers and trolley conductors. At first glance, the two occupations appeared to be pretty similar. But while the bus drivers were more likely to sit down for their entire day, the trolley conductors were running up and down the stairs and aisles of the double-decker trolleys. As it turned out, the bus drivers were nearly twice as likely to die of heart disease as the conductors were."
