Let me start by saying I have no vested interested in promoting the Mayo Clinic diet book.
http://www.mayoclinic.com/diet
My wife got this book about a month ago, and we started putting it in practice two weeks ago today. We're eating way more fruit, vegies, and whole grains than we ever have before. I have to say it hasn't been hard in the usual way a diet is.
I feel like I'm eating all I want, and am very satisfied after I eat. I guess it's less of a diet than a lifestyle change, and it's a change I can live with. I also dropped the diet Dew I was drinking all day long. I'm sure that has made am impact as well.
I've done low carb before and lost weight, but that's not a 'diet' I could maintain forever.
FYI, I'm 5'10" and went from 210.5 to 199.5 this morning.
Just thought I share.