From time to time I give up coffee. Once out of the withdrawal phase, I like the experience - feel more calm, grounded and better able to focus Sleeping is better, particularly after waking in the night it is much easier to get back to sleep. Interesting angle re the green smoothies. One of the commenters said it was just the fructose in these and harmful. However, the experiment described below had people eating 20 pieces of fruit per day and found no adverse effects and possible benefits. The important thing seems to be that the fibre is still present:

https://www.llicit.com/what-about-the-fructose-in-fruit.html