Ornish + Healthy Fat
I would suggest a modified ornish plan.
Dean ornish is a well proven way to stay healthy. Most people now suggest adding 20-30 g per day of "healthy fats" in the form of olive oil, nuts, fish, avocado, etc., in addition to the ornish menu.
Also very important is to remember that ornish is not just a menu: the plan includes daily exercise
and keeping your life 'manageable.' go for it!