I do agree with them on a lot of things, though Actually tracking ketones in a study meant to look at the effect of a ketogenic diet on mental health seems like a no-brainer. But even there, if ketone levels didn't track with improvement, that wouldn't mean that the ketogenic ratio of the diet wasn't having an effect. Lowering protein in an Atkins type diet, as long as you don't raise the carbs, will make the diet more ketogenic, to a point--but ketosis isn't the only thing lowered protein will affect, amino acids and amino acid derivatives like seratonin, dopamine etc. obviously are big players in brain metabolism. I've found too much protein near bed can disrupt my sleep, where a more ketogenic diet improves my sleep--more REM sleep (or at least, more recalled dreams), and the ability to get back to sleep if I have to pee at 3 in the morning. That's been a problem for me since my early 20's, at least--not too long after my first recalled bipolar symptoms become obvious.