I'm new to the smoothie thing- I'm usually the 'it's food so I'll bloody well eat it, not drink it' sort but I've gave in to up my protein. So I have a rookie question: how well does it keep? Just now I'm having banana, cup soy milk, packed sup spinach and vitamin powder. Can I make a batch and keep it in a bottle in the fridge?If yes, how many days should it be good for? Can I put it in my water bottle and keep it in my bag until lunch? My bag is probably bit above room temperature but not crazy hot. For some reason I imagine bananas means it should be eaten fresh but you can buy banana smoothie that lasts for days so...?
Also, while I'm here, frozen banana: worth the extra effort? I froze a banana once and it went black, that put me off