Huh yeah... you can see unhealthy people put away a 2 litre bottle of something like Coca-Cola without thinking twice, but that would seem like an obscene quantity of orange juice or something to almost anyone I think.
When I was a deeply unhealthy teenager (about the same time I was regularly going through a 30-pack of Coke in a week) I would frequently also drink a gallon jug of orange juice in a day. I still (decades later) have to keep an eye on myself around that stuff; all the variants of sugar-water are reserved for special occasions these days.