Xell wrote:From wiki:A study published in the January, 2005 edition of the American Journal of Clinical Nutrition concluded "Daily consumption of tea containing 690 mg catechins for 12 wk reduced body fat, which suggests that the ingestion of catechins might be useful in the prevention and improvement of lifestyle-related diseases, mainly obesity."
I think the "tea containing 690mg catechins" is not technically tea. In Japan, there is a RTD beverage called "Healthya," which contains 540mg catechin in 350ml (12oz.). It's a artificial "tea."
Average amount of catechins contained in Sen Cha leaves is about 15%. However, only the part of catechins can be extracted into water. One study says only 15% of the total amount of catechins extracts into water in two minutes infusion. So, if you infuse 4g of tea leaves -->4g x 15% x 15% = 90mg
Teacup1980 wrote: if you infuse 4g of tea leaves -->4g x 15% x 15% = 90mg
Nah, I really don't think it is as simple as that. You are underestimating the power of fresh high quality leaf along with other variables.
Most of the tea studies you see floating around usually don't get into the specifics of leaf quality, harvest season,brewing parameters, specific varietal etc etc. There's a lot to speculate on from the current science out there. Then you take into account the effect multiple boiling infusions has on a single pot of leaf and its gets even more inconclusive.
Teacup1980 wrote:I think the "tea containing 690mg catechins" is not technically tea.
A definite possibility. It could have been tea leaves brewed with ethanol to enhance extraction. I have seen a few studies like this.
teaisme wrote:Teacup1980 wrote: if you infuse 4g of tea leaves -->4g x 15% x 15% = 90mg
Nah, I really don't think it is as simple as that.
Of course, it's not as simple as this. But this is the basic concept everybody should know. I want to let people know 690mg catechins is not small amount.