Accurate Journal

Make sure you are keeping track of your intake and your output. Your body has the most accurate information as to your nutrition and exercise not matter what you put down. If you aren't seeing change and are stuck, re-evaluate your input and output. You are just as likely to over consume and be under in acitivity as you are to under consume and over exercise. As your body changes, so must your habits. As you begin to lose the weight, it becomes harder to burn as many calories now that you aren't carrying around those extra 10-50+ lbs. However, as you start to create muscle  and become stronger in your cardio endurance exercises, which either allows you to go much harder, faster, or stronger and you are still sticking to your caloric intake with your prior weight, you could be under consuming the nutrients you need. It is a fine line to walk between the two. I find it helpful to have a calorie tracking device (see fit tips section for more info on this) like my fitbit one. You may also want to consult with your physician, nutritionist, personal trainer, or all three if you have those resources available to you to help you evaluate your nutritional needs. Like I said, it is a fine line to walk and you need to make sure your body is getting nourished properly to perform properly.