I know my banana lovers in the house are going to riot once they read this post, but I just wanted to impart what I've learned recently about eating foods that are picked green.
When we talk about fruits it's important to keep in mind that in an ideal situation, fruit ripens on the tree (or at least get close), and then we eat them. When fruit is picked green, it still has minerals and vitamins that it has yet to develop in it's natural process towards decomposition. That is what fruit was born to do, decompose and produce seeds to continue the species.
Fruits gets nutrients from the tree, the sun, the water; All that. Eating fruits that are not local to our region, for example bananas, are never tree ripened. When we consume them, they pull enzymes and vitamins from our body to complete decomposition in our digestive tract.