Can someone tell me why fruit smoothies for breakfast are not a good idea? I had one with kale, spinach, cherries, strawberries and blueberries and a tablespoon of almonds today and this is my first day ever on the Whole 30. I thought I was doing well, but now am curious about this comment. I have not yet read the book but plan to, but in the meantime am curious. Thank you in advance.