I know this is a totally overdone topic but it isn't what you think. I was vegan for 5 years, so I thought I knew how to get protein. I was getting up to 65 grams a day, in fact, which I needed as a marathon runner and cyclist.
Last June I was diagnosed with bipolar disorder, and at the behest of doctors and friends I switched to as inoffensive an omnivoric diet as I could manage. It was really difficult, but I did start to feel better. I was eating a little fish, but rarely any meat. I re-introduced milk and eggs (we now have our own chickens, and I have no moral qualms about this, though I know many people do).
So here is the conundrum: I really want to be veg*n again, and I want to knock out the dairy as well. But some of the things research has shown to benefit bipolar people are tryptophan (present in turkey and milk), and omega-3 fatty acids. I know the latter are from algae, and I actually take flaxseed oil, though I know that's a debated source. But I'm comfortable (and happy about) getting the 3's from a vegetarian source.
Does anyone know if tryptophan comes in non-animal foods? My other concern is what might be in animal proteins that isn't in plant proteins. Why on earth would I feel so different after bringing animal products back into my diet? I was certainly getting enough protein before - is there a difference in quality (and I don't mean good/bad, just completenes)?
Physically (and obviously, morally/spiritually), I've always felt better as a veg*n. I'm not screwing around with my mental health, though. This disease almost killed me at least twice.