Here is a quote from Dr. Eades about IF.
BDNF, as its name implies, is a substance that increases the growth of new nerve cells in the brain, but it does much more than that. BDNF is neuroprotective against stress and toxic insults to the brain and is somehow--no one yet knows how, exactly--involved in the insulin sensitivity/glucose regulating mechanism. Infusing BDNF into animals increases their insulin sensitivity and makes them lose weight. Humans with greater levels of BDNF have lower levels of depression. BDNF given to depressed humans reduces their depression. And Increased levels of BDNF improves cognitive ability. In short, you want as much BDNF as you can get., and with IF you can get a lot.
More on BDNF here: http://en.wikipedia.org/wiki/BDNF
Here is Dr. Mikes full article with Robb's comments in there somewhere. As you can see, it generated lots of comments.
I felt smarter too and even feel a pinging sensation in my brain. I guess I'm generating loads of new nerve cells in my brain!