This is getting attention from being linked at the other thread, so I'll reply now since I'm awake. I'm not Kevin, but I talked about it with him at a nutrition seminar recently.

If I'm not mistaken, Kevin's diet is similar to the diet suggested by Will Ryan of Positive Vector (a rationality training company). You can get a brief PDF about it here. (You might know Will Ryan as Cosmos, the writer of Less Wrong NYC: Case Study of a Successful Rationalist Chapter.)