Critical logical thinking can take you far if you have a basic grasp of physiology and biochemistry. This stuff is always evolving with new data and theories so it does help to at least have a 101 level knowledge before diving into the minutia.

After that well cited blogs are good mainly because you can get to the primary research and see if you agree with the bloggers comments. A fun little experiment is to skip reading the blog and go straight to the citations and read the studies for yourself and come to some of your own conclusions. Then go back and read the blog with fresh eyes. This way you won't be influenced by their interpretation first.