Substitutions:Yogurt– Nonfat greek yogurt is a great way to add protein and richness to smoothies for a low amount of calories. You can substitute with dairy free yogurt or full fat yogurt. You can also skip the yogurt, but may need a little bit more milk.Milk– Any milk will work in this recipe. Almond, Dairy, or other non dairy milks will all work.Protein Powder– Protein powder isn’t necessary but it is recommended for this recipe. The added protein will help keep you full, rather than this just being blended fruit (sugar and carbs). Any protein powder will work. Frozen Fruit– You can substitute frozen fruit for fresh fruit. Substitute 1:1.