My daughter and granddaughter both love their juicers. They followed the manufacturer's directions since not all juicers have the same motor or capacity. Kale, carrots, celery, spinach or any green vegetables are great with unsweetened apple juice. My daughter used just about any fruit in her juicer but she removed the cores from apples, pears, peaches, etc. Unsweetened natural yogurt is also a good source of protein and probiotics. I add a little bit of vanilla flavoring to my fruit and yogurt. You can also use flax and chia seeds along with acai seeds for added fiber. Good luck!