Have a tenitive surgery date

Ok so I saw Dr.Leslie today and all went well.  He wants me to lose 50 lbs before my march 16th date.  My insurance requires 6 dietiicsion visits.   The dieticsion said that I need to start eating breakfast (yuck) and chewing everything to compleate mush, also to try to get more movement in but the Dr. said that I just need to worry about the diet changes now since I have planter fasciitis and cant do much walking.  Do any of you have any tips to help me with the weight loss part of it all so I can meet my goal by then.