The book is called The Life Transforming Diet. It is a week by week plan and the basic rules are:
1)Don’t mix your proteins and starches
2)Fruit and/or nuts for breakfast
3)lots of exercise
4)Tons of veggies
5)Water Water Water
6)Whole wheat bread (The Rambam says that bread is amazing for you, I think the book says to have it daily, I don’t really remember.)
7)More exercise
There’s more but I don’t really remember. Definitely read the book.