There is a bit of History in the matter

For all you GoT fans out there... =)

Yes yes...There is quite a bit of science and history that goes into the art of juicing fruits and vegetables. I did my research, and it was mentioned in the documentaries as well, that we human beings suck at being healthy. We have strayed way far away from what our ancestors used to eat and how they managed their eating habits. See, back then, they didn't have the luxuries that we do now. No heated or air conditioned homes, cars to go to the grocery store. They had to deal with the winter, which rarely yielded any fruits or vegetables, and summer, that was usually followed by famine. Before these seasons, they would eat lots of food that was available to them so the body could store fat just in case a famine showed up or winter was extra long. They never really gained any excess weight because they had to continually move and hunt for their next meal which burned a lot of calories and fat. 

Snapshot taken from Jim Cross's documentary Fat, Sick, & Nearly Dead

Nowadays, there is no need to go hunt for food or save up fat for winter. We sit around all day at work eating the copious amounts of crap that we call food. We have cars that take us to the grocery store where all food is laid out for us to grab and go. Today, people eat 60% processed food, 30% animal products (including dairy), and only 5% vegetables/5% fruit.  So in reality, we are not getting a lot of nutrients or even at all if you live a lifestyle of constantly eating processed food.