Welcome! I'm glad you've finally made the commitment to make this happen. I'm a recovering vegan, myself, and after about 5 months of PB, I'm leaner and stronger than ever.
Regarding your DH's cancer concerns, may I suggest you (or he, if he's willing) do some research on the connection between sugar consumption and cancer? In short, sugar is cancer's favorite food...and as far as the body is concerned, all carbs are sugar.