Don't avoid fats because you think they make you fat. Although they can be high in calories, small amounts are essential. Willow says, "Not only does the fat help your body fully absorb all of the nutrients you're getting from the other ingredients (fat-soluble vitamins A, D, E, and K need fat in order for our bodies to use them), but fat helps a meal feel more satiating." Monounsaturated fats (MUFAs) also have the added benefit of raising good HDL cholesterol, lowering bad LDL cholesterol, and helping prevent belly fat. Almonds, cashews, peanuts, peanut butter, flaxseeds, chia seeds, and avocados are excellent sources; just go for small amounts, since they're calorie-dense.
This clear-skin smoothie is made with both avocado and almond butter.