I usually drink kombucha and I never thought that maybe its not ok during pregnancy, anyone have any idea?
I always thought part of the problem with homemade fermented drinks is the unknown alcohol content. That said, I am known to follow my guts and cravings during pregnancy. Meaning, I do eat raw fish, and eat unpasteurized cheeses, I drink an occasional cup of coffee. I do not drink alcohol, as it just does not feel right for me, and I don't crave it, but I don't think an occasional drink in moderation would be terrible harmful. I do ride bikes (who came up with that rule?), but I don't waterski.
I personally don't think it's much different than eating yogurt, and cultured things are typically considered good for pregnant women.
I think the thing with green tea is excessive consumption right? Like more than 6 glasses a day or something? And, I think then, there's no actual correlation or research to back that up? More like speculation that certain things that are normally GOOD in green tea can actually cause problems for brain development or something if an excessive amount of them built up.
ditto forestmushroom, but I'd also add to stick to brands / makers you know and trust. With komboucha in particular there's risk of bacterial contamination if it isn't prepared properly. So if you're doing it yourself make sure to properly sterilize everything and if you're getting it at the local farmer's market, stick to the sellers you already know and love.