The Green Smoothie Bible is best used as a diet where you only replace one of your meals with the smoothie. I found it easiest to replace breakfast or dinner with a smoothie because I am at home (not at work trying to use a blender) and I can take the time to drink the entire smoothie. Effectiveness The Green Smoothie Bible is most effective as a diet if you replace only one meal with a green smoothie instead of trying to replace all of your meals with a green smoothie. This means that you can last longer on the diet without feeling really hungry or getting many of the negative side effects. Side Effects It's not a good idea to use The Green Smoothie Bible recipes to replace all of your meals. Green smoothies have a lot of fiber and high oxate ingredients, which can cause problems in the long run with stomach problems (caused by the fiber) and fungal infections (caused by the high oxate). Ease of Use The Green Smoothie Bible is pretty easy to use because it has the ingredients and recipes of all of the green smoothies that you need for the diet. Some smoothies are more difficult to make than others, but overall the instructions are pretty simple. A couple of ingredients may need to be found at health food stores instead of at the regular grocery store.