I switched from Tirz to Reta a month ago and I was just as nervous...I had reached a stall on Tirz and the scale was not moving, no matter what I did. I decided to try Reta and the first few days I didn't notice a huge increase in the food noise, but after a while, I started getting those night cravings, that always did me in before. I wanted to give the Reta time to work, so I kept on, added in the Cagri, and it seems to be working fine now. The food noise is gone again, so are the cravings, and the weight is dropping off. Give it a try, you can always switch back if its not a good fit for you.