Respectfully (I've been vegetarian off and on throughout my life), "I can think just fine right now" is a fallacy. The effects of a nutrition deficiency may no

Respectfully (I've been vegetarian off and on throughout my life), "I can think just fine right now" is a fallacy. The effects of a nutrition deficiency may not manifest for years. The article describes the substance as having a role in brain development. It also mentions psychosis. Now, I don't have any more information than what's in the article. But it's perfectly plausible, for example, that under-supply of this thing will contribute to your having some kind of dementia later. Or it could ultimately be harmless. But you can't dismiss something like this solely because of (subjective and) short-term effects.