I'm not sure about all those questions. A better source to learn how fat and carbs interact with the body then DANDR is the Protien Power book. It goes into more scientific detail. There is also one out there called "The Big Fat Lie" or soemthing like that about the good proporties of eating fats.

The best resource though would be to look into a college level biology book. You would have to make sure to get a very updated one. Doing research online for recent studies and published works can also help.

If your really inthralled you can subscribe to journals where scientific studies are published like the New England Journal of Health. You would have to wade through tons of medical articles most of which don't relate directly to metabolism though.