Just had an experience from a little experiment, might as well post here to keep some kind of log.
I tried nutritional yeast two days ago, a very small amount. Have been thinking I might be dealing with some nutrient deficiency since I've been losing weight for a few months now, despite eating normally, hence the yeast. Did a hot water extract of about 1/6 teaspoons worth. Was trepidatious, because the intestinal problems have for a long time gone together with hormonal problems (high E, apparently low T), which I also do not fully understand but seem related somehow. Yesterday I really struggled to fall asleep, identical to what I've experienced before when hormonal problems have been severe. Brain could not settle down and doze off, I felt warmer, and my chest was somewhat itchy. Decided to increase vit E dosage again, which I've been cutting back recently. It appears nutritional yeast is a no-go.
It seems, again, like the hormonal and digestive situation are related, but I don't know how. Slowing digestion can for sure lead to worsened hormonal symptoms, and faster, larger BMs often improve libido and so on. Feels like some systematic approach is called for, the question is what. Progesterone is one of the few things I've had, on net, positive experiences from, but have not used it for several months - the hormonal ups and downs it caused were a bit frightening. Maybe try eating some liver again.