What Causes Weight Loss And Increased Appetite While On Belviq?

Hi, I have been taking Belviq for about 9 weeks and have lost 12 lbs. I am female age 57. 5 ft 3 and 190 lbs. my problem is the last few weeks I have been just as hungry as before I started it. Even shortly after eating I feel ravenous. I am keeping my calories between 1100-1300/day. I only get minimal exercise. Has anyone else complained of this? I don t know wether I will stay on it. Frustrated! Marilee