Juices are a great way to get a hit of nutrients; Smoothies are a liquid meal
One word: Fibre
A juice retains all of the nutrient and water content of the fruits and vegetables used to make it, and the fibre has been removed. A smoothie is blended and therefore retains the fibre, nutrient and water content. Juices are a great way to get a hit of nutrients instantly absorbed into the bloodstream. Smoothies are perfect when you need a liquid meal, with the fibre keeping you feeling full for longer.
Juice & Smoothie Definitions
Juice is made in a juicer. Raw fruits and vegetables are processed in the appliance and the end product is a nutrient-filled liquid. In Lehmans terms, a juicer is simply a fiber extractor. A juicer extracts the water and nutrients into a liquid juice and leaves fiber as a by-product product. This allows the drinker to condense large amounts of fruits and vegetables into one juice.
Smoothies are typically made in a blender, and nothing is extracted or removed from the whole fruits and vegetables. A blender essentially "chews" one's food at a speed and efficiency far beyond a human's ability to chew. Blending fruits and vegetables into a smoothie allows one to consume 10x the volume of plants vs the traditional chewing method.