when someone is making strong nutrition claims like this i always ask people to inquire about the research used to support the claim. many times people without a health or science background translate information into something that is not accurate. green leafy vegetables contain oxalates but there is no evidence that these foods are bad for health. there are instances where someone may need to limit oxalates such as those who are prone to kidney stones but this is not a concern for the general "healthy" population. most people can include green leafy vegetables like those in smoothies as part of a healthy diet. in fact it is encouraged! the 2010 dietary guidelines recommend green leafy vegetables along with those that are orange (sweet potatoes carrots etc. ) starchy (potatoes corn) and other vegetables like cucumbers and zucchini. variety is always best to meet nutritional needs and maximize health. if you are concerned about oxalates check with your health care provider.
i saw an article which said that consuming green smoothie every day may be devastating for your health is that true?