As others have said, you have lot's of time to make a decision. I was initially diagnosed at the same age as you, but with higher stats. So for me, Active Surveillance would obviously be my choice. I have adopted the diet you are thinking of and I think it does help. I do cheat and have a little turkey at Christmas and Thanksgiving and a little skinless chicken a couple of times a year. I also eat fish and try to eat a lot of dark colored vegetables and fruit. As well, I drink a glass of pomegranate juice with a half teaspoon of turmeric, some black pepper, oregano and rosemary every morning. It sound distasteful but I find it surprisingly refreshing. All of these are thought to be beneficial against cancer - I figure if it won't hurt you, why not?
I just had my 3rd biopsy and even though there are now 3 cores positive, the total percentage is lower than the 1st 2. That is probably just where the needle hit, but it at least indicates that things are pretty stable.
Previously people in their 50s were considered far too young for AS but very, very gradually attitudes are changing. Studies are indicating that people with small amounts of Gleason 6 following AS have no less life expectancy than those who seek more aggressive treatments. There are always the outliers who may have a more aggressive disease and you have to accept that chance. However, that is why you have the followup biopsies. My urologist says now that I have 3 under my belt (figuratively and literally) I can probably go 2 years before the next one provided my PSA stays reasonably stable.
I would highly recommend watching Dr. Myers videologs on the subject:
B-year: 1959 PSA ~7.4
-1Biopsy: 2011; 2/12 positive, G6(3+3), both 30% T1c
-2012 Tesla 3 MRI - no nodules or progression outside prostate.
-2nd biopsy 2 /10 positive, G6, 40 & 70%
-3rd Biopsy July 2013 3/13 positive, G6, 1%, 5%, 40%
Active surveillance; following Ornish/Michael Milken-style diet
Post Edited (Dreamerboy) : 7/24/2013 8:05:06 PM (GMT-6)