They're not necessarily popular among the nutritionally minded; they're popular among the trendy, or in the case of non-dairy "milk," among the allergic.
Green juices are a way to get some antioxidants and vitamins if you won't eat the whole vegetable. They're definitely better than not eating veggies, but eating the whole food is always better than the juice (again, except for people with specific health issues.) When you juice, you lose the fiber and some other nutrients, and you concentrate the sugars. If you already drink fruit juice, switching to a veggie juice would probably be better, but otherwise it's not necessary to have any juice. Although like other folks here, I've been known to toss a small handful of kale or spinach into the blender with berries and milk for a smoothie. That way you're getting the whole veggie.
As for the non-dairy "milks," IMO they're a second-best option for people who can't or won't drink real milk. The calcium is almost all added, so it's more like taking a tablet than like getting natural calcium from food. There's no real research about how well the body utilizes that type of supplemental calcium. And except for soy, they're disappointingly low on protein, which is my primary reason for drinking milk. It can also be hard to find one without lots of sugar or artificial sweetener. Again, if you can't drink milk, it's worth looking at them, but they don't have any super-special benefit.
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