There was a study I read about that proved not only could the brain use keotenes, but it worked more efficiently that way. I think I had found it on the Atkins site, but I havn't been able to find it again in the last few months so I can't point directly to it.

Like you said in the above post our body does produce glucose through protien. This is also enough to run the brain.

Btw pre LC my fasting blood sugar in the morning would be about 90. Then it would drop all day sometimes getting around 20-30 closer to night. Now it starts at 80-90 and stays within a closer range around about 70-110.