As strange as this may sound but your not eating enough. Or i should say you need to get into the routine of eating 3plus meals a day.
On a standard 1800 cal diet you will be eating 5 times a day. That is the customary breakfast, lunch, dinner with the inclusion of a mid-day snack and a late evening snack. The late snack should not be eaten later than 9:00 at night. If you go to bed before 9:00 your better off skipping the last portion. The key to the diet or meals is choosing the right size portion or serving. So look of the back of packaged foods and figure out what you will eat and what you will save for later. And by scheuleing your means through out the day your are not starving yourself for food.
If you really want to got hard core create a food log and keep track of all that you at during the day and if possible keep track the calories.
If I remember correctly for calorical intake to maintain weight. Is
Your wieght X 10 = The amount of daily calories to sustain your current wieght
210 pounds X 10 = 2100 Cal per day
So just by eating better at around 1800 -2000 cal and light exerise you win start to loose wieght.
Plus don't become a slave to your scale. See how your cloths are fitting you. How thinks fit on you is better indicator that you are loosing inches instead of pounds. Also it maybe time to kick up the exercise program.
But of course this is my