Welcome to the fourm. I don't see you as needing to be a long-term member!
I have to agree with your doc, based on the information you've given.
A PSA is .9 something is pretty normal, depending on your age. In addition, I don't think insurance would pay for a biopsy or such with a PSA of only .9, unless the doc can find a lump he/she is worried about.
If you are concerned, though, and want some piece of mind, you may wish to get a second opinion.
I had a PSA of around 1.2 for years since I was 40 and there were no worries at all from any of my urologists or my family doctor. All were experienced with patents having prostate cancer.
There is some evidence that a low-fat, low-calorie diet helps to prevent prostate cancer growth. It is not conclusive.
Other than that, I'd say enjoy life and be healthy!
Thanks for your inquiry.
Please as questions anytime you wish.