Like everyone else who has tried it I love Nutritional yeast. I eat raw and specially flavour wise its great. but just happend to found out that is not good to consume a lot of it as it has "hidden mycotoxins" Mycotoxins means a food tends to feed pathogens. being the root cause of many dis-ease that are difficult to treat or diagnose. other ones are mushrooms, dried fruit. and grains.
It's good stuff - I get it in bulk at the Co-op. I use it in sauces (it helps thicken them), sprinkled on popcorn, or to make a "cheesy" sauce.
I was first introduced to nutritional yeast at the Rainbow Gatherings... at the main meadow daily meal, there's a guy who walks around with a big can of it, yelling "Yyyyyyyeeeeeeeeaaaaaaaaaasssssssstttt!!!" - and you gotta flag him down if you want to add some to your food. So funny!
Just be sure to use flakes not powder if the recipe calls for flakes, or adjust the amount of the powder. I used the same amount of powder in a no-cheese macaroni that called for flakes and I could not eat it, it tasted so bad. Otherwise, I like it in spaghetti sauce. It really tastes like parmesan cheese. I haven't really liked other things I've made with it.