When you think of the Standard American Diet you will see why the FDA and many book authors promote a plant based diet. If the main vegetables on the average American's place are french fries and ketchup, well you will understand why the FDA has to intervene and tell us to eat more fruits and vegetables! If you look at other cultures, meat is a part of their diet. It is not the bulk of their diet but it is an integral part of their meals. How much of what you eat matters. Exclude food groups only if you have a true allergy or sensitivity. Otherwise, eat a balanced diet that is comprised of as many whole foods as possible. As far as juicing goes, our bodies don't need that many micronutients. We need a very small percentage of vitamins and minerals and a good proportion of macronutrients (carbs, proteins and fats). Again, eating a plant based diet to "boost the immune system" means next to nothing. But I am no expert. I don't have fancy titles before my name or fancy letters after my name. Do your homework after considering both sides of the argument and choose what is best for your body, not bodies in general.