Believing New Things Workbook question

I am working on believing new things. Each day I am to write down the new sentence I want to believe. Should it be the same sentence for the whole month? How long should the sentence be? My main focus has been weight loss. Should the sentence be my goal weight…seems too hard for me to believe right now. Here is what I have come up with.
This is what I wrote this morning but it seems a bit long. I follow my protocol and only eat when I am hungry and stop when I am full. As a result the fat is melting off my body. I am thriving in my body and will get to my goal weight of 145 pounds.
The thoughts I wrote as a main goal where: I weight 145 lbs. In getting to that number, the fat just falls off my body. I follow my protocol every day and don’t overeat. My body naturally regulates to keep me at a healthy weight. I have no food drama and only eat when I am hungry and stop when I am full. I have created a thin body. If I choose, I can plan to eat anything I want 24 hours ahead of time. I only eat to fuel my body and I only eat foods that feel good in my body. I am creative and have figured out how to have peace and joy in my life without using food. I enjoy social settings for the company (people involved) not for the food. Just as I have decided not the drink and smoke several years ago, I have decided not to overeat and only eat to fuel my body. I am healthy and confident in my body.
Some of these sentences I believe now and some I want to believe. I am working on figuring out what I should write for my belief for the month. Any suggestions on how to refine it further.