This makes so much sense to me. No wonder that animals grazing are always moving around to different plants...they know that they can not eat too much of one type of green. Our bodies are the same way. I believe this is God's way of allowing the greens to replenish. If a certain type of greens were consumed depleted, they wouldn't be able to regenerate.
If you are like me, and just used to putting spinach in your smoothie, here are a few other greens to try. Some are certainly stronger than others, but usually taste fine when mixed with fruit and a little stevia. Here are some other greens to try!