The banana and strawberries in this smoothie provide a great dose of both fiber and vitamin C – and, by using low-fat yogurt and milk instead of the full fat varieties, you get that creamy taste and texture without the additional calories. Swap out the vanilla low-fat yogurt for Greek low-fat yogurt for an even bigger punch of protein. Regularly substituting processed foods with fresh fruits, vegetables and whole grains is a great step in improving your overall health.