Meat or no Meat?

I have a question for all willing to contribute with more than anecdote but with a scientific approach.

Is Meat harmful to humans? Can it be eaten daily if it is grass fed/organic? Is red meat really better than white meat? is it harmful regardless of your "type"?

I have read such conflicting views, i am never certain of how much or if any at all meat i should include. You hear groups/people like "Weston Price foundation" and "Mercola" for daily meat consumption, and others such as the China Study speaking adamantly against it. What is your opinion?