When you're wondering "how to maintain lost weight"...it's actually only hard to maintain lost weight if you lost the weight in an unhealthy way (or too quickly). Losing weight through proper diet and exercise (and developing a myriad of healthy habits) is the only way to truly make weight loss permanent. Don't get discouraged if you lost the weight in other ways...it's still possible to maintain it but you are going to have to develop those healthy habits in order to do so.