how to make ahead of time smoothies
In most cases, you can make smoothies ahead and refrigerate them for up to 24 hours or pack them in a thermos and take them with you. There are a few exceptions, though. Use smoothies made with ice cubes immediately, rather than storing them. As the ice cubes melt, the fruit puree separates from the water, leaving a soggy, uninspiring mess. Sometimes fruits that turn brown can discolor a smoothie that's been made ahead of time. Bananas, in particular, have this tendency.