I do have the Mayo Clinic Diet Book. I purchased it after my transplant because I wanted to develop healthy eating habits. I did not need to lose any weight back then, and I continue to use it as my guide. I especially like that it stresses a healthy-for-life plan for eating and it encourages activity. I find it to be encouraging and also flexible.
My nurses tease my husband at my visits that he must be benefiting, too!

Here is a link, if you want to read about the Mayo Clinic Diet.
https://www.mayoclinic.org/healthy-lifestyle/weight-loss/in-depth/mayo-clinic-diet/art-20045460
There is also an online version of the diet plan.