This is an area of general well-being now with many schools of thought. It is wise to realise that Doctors are not Nutritionists and vice-versa.
There are now many “authoritative” books on foods to prevent and reduce cancer and generally for a healthier life. One such is:-
The Plant Programme
Recipes for Fighting Breast and Prostate Cancer
Prostate Cancer – Understand, Prevent and Overcome…
By Professor Jane Plant
Any of her other books also.
A search on the web for “Food Books for Prostate Cancer” or something similar will provide a whole host of books.
Some foods that are specifically beneficial for Prostate Cancer:-
Tomatoes – rich in Lycopene, thought to be more significant when cooked. (Lycopene Tonic has helped reduce my enlarged prostate)
Some foods that are said to be avoided with any cancer are sugar and Dairy
For a helpful introduction to Nutrition, click here.
Herbs
There is some value in using herbs to treat many diseases, a good starting point for information is here.
Natural Treatments
A good start can be made here for those who would like to explore the many ways of natural treatments.