In my experience you can find written support for any diet. I try to read material from credible sources as much as possible.
I don't trust the tv news that much since a lot of their stories come from press releases that are given to them by the companies promoting the "news." I like to read books written by people who got the results I want to have.
And so it was when I went vegan. I was a happy meat eater, and I was a happy vegetarian. But when I decided to try being vegan for 30 days to see how I felt... wow... what a difference. After feeling so good I couldn't imagine going back to eating meat or dairy products.
So, for me, it didn't matter what anyone wrote. I could see the differences in my body and how I felt. I don't need a book or an expert to tell me that veganism is the way to go for me.
When I went vegan, the following all happened to me:
I lost 20 pounds easily
My cholesterol went from 293 to 253
My triglycerides went from 390 to 144
I stopped having stomach problems of any kind
My carpal tunnel syndrome went away completely
My skin cleared up and remains clear
My nails and hair got stronger
I stopped having headaches all the time
My allergies all but disappeared
After all that, the thought of putting dairy products in my system was abhorrent to me.
Okay, this got longer than I intended. But the point is... experiment and do what's right for you. If you feel best eating meat, do it. If you feel better being vegetarian, do that. Try being vegan. You may be really surprised (as I was) with the results.