One of the easiest ways to prevent food waste is to freeze the food to prevent spoilage or rancidity. When it comes to cut-up fruit, you can freeze it and use it in smoothies by simply keeping it in airtight containers. But if you plan to eat thawed fruit later, be sure to sprinkle a small amount of sugar on top. Fruit contains pectin, and when you freeze it, the pectin dissolves. Pectin gives fruit its shape, so when it thaws, it can be a mess. By adding just a little sugar, you give it an extra pectin boost.