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04.03.2024

Black tea inhibits prostate cancer more strongly than green tea

Tea contains flavonoids that can end up in the prostate and perhaps slow down the growth of possible tumors. Black tea may be a better source of these cancer inhibiting flavonoids than green tea.

Study
In the article, which appeared in 2006 in the Journal of Nutrition, pathologists from the University of California Los Angeles describe animal studies and a small experiment with human subjects. In this post we limit ourselves to the latter part of the publication. 20 men aged 54-76 with prostate cancer participated in this.

The men were scheduled for an operation to remove their prostate. The experiment started a week before the procedure and lasted 6 days. The researchers divided the men into 3 groups.

Men in the control group [SC] drank a glass of soft drink with as much caffeine as in a cup of tea 5 times a day. In one experimental group the men drank 5 cups of green tea [GT] every day, in the other experimental group they drank 5 cups of black Darjeeling tea [BT] every day.

Both green tea and black tea contain flavonoids. Green tea contains more 'bare' flavonoids - flavanols - than black tea. Flavanols have well-studied and interesting biological effects in vitro - but limited bioavailability in human research. The more complex theaflavins in black tea have been studied less often.

Results
The researchers found more flavonoids in the removed prostates of the GT and BT groups than in the prostates of the control group. Although we're speaking about picomoles, they were present in both the prostates of the GT and BT groups. This is shown in the table above.

On the last day of the experiment, the researchers took blood from the men and added human LNCaP prostate cancer cells. They saw the cells grow slower in the blood of the men in the green tea group, but even more slowly in the blood of the men in the black tea group.

Conclusion
"Tea polyphenols and theaflavins are bioavailable in the prostate where they may be active in the prevention of prostate cancer", the Americans summarize.

Source:
J Nutr. 2006 Jul;136(7):1839-43.

More:
Quercetin boosts inhibitory effect of green tea for prostate cancer 27.01.2014
Tea protects prostate against testosterone 10.12.2013

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Cancer Prevention & Survival
Prostate Cancer
Tea

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