I drink 0-3 cups a day of either rooibos, green, white, oolong or yerba mate. With the exception of yerba mate though, they are all high in fluoride (I don't know the levels for white tea though). This kind of concerns me. I've read a lot of bad things about the toxicity of fluoride, even from tea. And that the levels of it vary so much depending on the area it is grown, the soil and pollution levels in the area, which is what it is absorbing in the tea leaves.
They also have aluminum in them, in the tea leaves as well. Which fluoride supposedly increases the absorption of. And then there is the problem of the inhibition of iron. It's not just the tannins, but the polyphenol anti-oxidants that inhibits the iron absorption. So even caffeine free beverages like cocoa, mint tea, chamomile, rooibos etc. all inhibit the absorption of iron. Maybe, as vegans we shouldn't drink anything but water with our meals? Drink other beverages between meals. Seems like every single substance out there sans vitamin C, INHIBITS iron absorption. It's so frustrating. Even Calcium inhibits iron absorption!
What do you think about the fluoride levels in tea? Are you concerned at all? What bothers me the most about it is that there are no regulations on it and they don't even have to test or list the amount the way that bottled water does and the regulation on bottled water. So they can be way higher then the Max. allowed for any other source. The max for fluoridated water supplies is 1.2PPM, while some teas have been found to be over 6 or 8 PPM.
I'm not trying to be alarmist, just bringing it to others attention. It might be a concern, esp. if you have any thyroid problems or anything. Instant tea is the worse culprit with the highest levels, as well as low quality brick tea.
http://thyroid.about.com/cs/toxicchemic ... ouride.htm
http://thyroid.about.com/cs/toxicchemic ... ridepr.htm
http://lpi.oregonstate.edu/infocenter/p ... index.html
http://www.mercola.com/2000/sep/10/gree ... hyroid.htm
The last article on mercola's site is alarming, yet I can't find anything that confirms it's wild claims about the levels found. Most sources say the levels are about 0.1-0.4 per cup of green tea. While that article claims "While in 1976 a Belgian analysis showed content of between 50 and 125 ppm fluoride in 15 varieties of tea (3), a Polish study in 1995 found fluoride content of up to 340 ppm in 16 varieties of black tea (5). A major Canadian study published in 1995 reports average fluoride content in tea to be 4.57 mg/l in the 1980's.(6)
A website by a pro-fluoridation infant medical group lists a cup of black tea to contain 7.8 mgs of fluoride (7), which is roughly the same amount as if one were to drink 7.8 liters of water in an area fluoridated at 1ppm. It is well known that fluoride in tea gets absorbed by the body similarly as the fluoride in drinking water (1,8)."
7.8mgs in a cup (about 4-6oz) of tea. I don't believe that! The instant tea analysis found up to 6.5mg per Liter, how many cups are in a liter? Anyways, don't drink instant tea at least!
"A study by researchers at the University of Mississippi suggests that very high doses of green tea extract may actually activate - rather than shut down - the genetic mechanisms that help certain tumors survive and grow."
http://www.aphroditewomenshealth.com/ne ... news.shtml
http://www.nutraingredients.com/news/ng ... ast-cancer