Green smoothies are quite possibly the most healthful food in the universe. They’re a combination of greens (often spinach or kale), with fruit or fruit juice, plus maybe some spirulina or chlorella. When it comes to micronutrients, fiber, and minerals, it’s practically impossible to get more nutrition per calorie than what a green smoothie can provide.
But there’s more to life than just nutrition and there’s frankly nothing more vile tasting than an ineptly prepared green smoothie. The key to making a drinkable green smoothie is nailing the proportion of greens to fruit. Get the proportions right and you’ll have something that actually tastes pretty good. There are entire books and websites devoted to green smoothie mastery.