I think I remember Eliezer complaining somewhere that calorie restriction (or something like that) makes him tired or just unable to do his work, but I don't remember the source. I'm pretty sure that he tried it.
Yes, he did. He found that as little as missing a meal knocked him out.
Currently, he's found a ketogenic diet which is working for him at least in the short run.
Haven't had one of these for awhile. This thread is for questions or comments that you've felt silly about not knowing/understanding. Let's try to exchange info that seems obvious, knowing that due to the illusion of transparency it really isn't so obvious!