How much stock do you put in nutritional advice or news?

I think we’re all familiar with the contradictory stories that frequently come out about X food and how it’s good for you, then it’s bad for you, then it’s good for you again, etc. and so forth. And just like with parenting, everyone seems to think they’re an expert.

How do you personally sift through the noise about nutrition? What is some of the best nutritional advice you’ve been given?