Starting Reta soon any tips?

A little context I’m a 20 year old guy who’s 5’4 and about 175lbs, I’ve had problems with food in the past but am pretty healed now. I started going to the gym, stopped bing eating, and eat fairly clean I just have a hard time with hunger especially since I’ve been upping my activity. I want to try Reta and finially full sending it, any advice or tips?