The following recipes, although inspired by flavour combination and nutritional benefits mentioned in my 40+ Quick and Healthy Smoothies eBook, drink more like a juice than a thick smoothie. They are dairy-free, nut-free and gluten-free. >>> I like to add fat to smoothies because vitamins ADEK are fat soluble and absorbed by the body only in the presence of dietary fat. Avocado, nut oils, nuts, almonds, seeds and coconut oil are all great sources of good fats.