| | Soy or not...
The soy debate is for another article and while I agree that probably at least 50% of soy products are either full of sugar or processed junk - there is little solid evidence in my mind to say that soy is definitively good or bad.
So not to hijack any further - I think that any smoothie containing the base of avocado, cucumber and spinach is a good start. Then just take it from there and add whatever takes your fancy/is in the fridge!
Have a wonderful day