A word on whey: I had read for many years that whey protein powder is good for people with ME/CFS because we have low glutathione levels, and whey helps to increase glutathione. However, I always assumed that I couldn't try that particular treatment because I am intolerant to dairy. When we started on our new diet in February, our dietician explained to us that most people who are dairy intolerant CAN tolerate whey. It is the part of the milk that is left after the curds are removed (remember Little Bo Peep and her curds and whey?), and the curds contain most of the casein and lactose, which account for most dairy sensitivities. So, we tried it and found that both my son and I tolerate it with no negative effects.
Just be sure to read labels and choose the right kind of whey protein powder. Some contain all sorts of additives (including grains that should be avoided on paleo or anti-candida diets). This article on whey and glutathione explains what to look for.
So, this smoothie is not only delicious and nutritious but will also help to improve glutathione levels, which should help your mitochondria and energy production - what a package deal! And if you've been on a low-sugar diet, it tastes decadent, even though it isn't.