Drinking large amounts of tea could increase the risk of prostate cancer, research has shown.
Scientists found that more than seven cups a day raised the chances of men developing the disease by 50%.
But whether the link is causal or due to coincidence is still unknown.
Study leader Dr Kashif Shafique, from the Institute of Health and Wellbeing at the University of Glasgow said: "Most previous research has shown either no relationship with prostate cancer for black tea or some preventive effect of green tea.
"We don't know whether tea itself is a risk factor or if tea drinkers are generally healthier and live to an older age when prostate cancer is more common anyway."
The Scottish researchers tracked the health of more than 6,000 men aged between 21 and 75, over a period of 37 years.
Participants provided information about their tea, coffee and alcohol consumption, smoking habits and general health.
Just under a quarter of the men were heavy tea drinkers. Of these, 6.4% developed prostate cancer during the course of the study.
Those drinking more than seven cups of tea a day were 50% more at risk than those who drank no tea or up to three cups.
The findings are reported in the journal Nutrition and Cancer.
Dr Shafique added: "We found that heavy tea drinkers were more likely not to be overweight, be non-alcohol drinkers and have healthy cholesterol levels. However, we did adjust for these differences in our analysis and still found that men who drank the most tea were at greater risk of prostate cancer."
Each year almost 41,000 men in the UK are diagnosed with prostate cancer and around 11,000 die from the disease.
Men taking part in the study were drinking traditional black tea rather than green tea, which has been shown to have anti-cancer properties.
Black tea contains far fewer flavanols, protective plant chemicals, than green tea. But the researchers said they knew of no ingredient in black tea that might promote prostate cancer. Drinking large quantities of tea had no link to more aggressive forms of the disease.
The researchers concluded: "There has been much interest in the preventive effects of green tea on prostate cancer risk; however, we found a harmful effect of black tea on prostate cancer risk.
"The association between tea intake and prostate cancer should be investigated in prospective epidemiological studies in relation to different compositions of tea."
Coffee Could Save Your Brain
... Well, maybe. A study in the <em>Journal of Alzheimer's Disease</em> suggests that there's something in coffee - though researchers have yet to determine what exactly that "something" is - interacts with caffeine to boost the levels of granulocyte colony stimulating factor (GCSF), a growth factor that seems to be able to <a href="http://www.huffingtonpost.com/2011/06/24/coffee-could-ward-alzheimers_n_882931.html" target="_hplink">fight off Alzheimer's disease in mice</a>. The amount of coffee needed in the study is equivalent to about four or five cups of coffee for humans. Researchers said <a href="http://www.j-alz.com/press/2011/20110621.html" target="_hplink">GCSF likely has this effect</a> because it causes stem cells in the bone marrow to come into the brain and remove the beta-amyloid plaques associated with Alzheimer's disease. It also has a role in forming brain cell connections and creating new brain neurons, researchers said.
Coffee Could Lower Depression In Women
Women who drink a few cups of <a href="http://www.huffingtonpost.com/2011/09/27/coffee-cuts-depression-women_n_982122.html" target="_hplink">caffeinated coffee have a lower risk of depression</a> than women who don't drink any coffee, according to a Harvard study. That research, published in the <em>Archives of Internal Medicine</em>, shows that women who drink two to three cups of coffee a day have a 15 percent lower risk, while women who drink four or more cups of coffee a day have a 20 percent lower risk. Study research Dr. Albert Ascherio <a href="http://www.huffingtonpost.com/2011/09/27/coffee-cuts-depression-women_n_982122.html" target="_hplink">told HuffPost</a> earlier that "caffeine is known to affect the brain," because it "modulates the release of mood transmitters." "I'm not saying we're on the path to discovering a new way to prevent depression," he said. "But I think you can be reassured that if you are drinking coffee, it is coming out as a positive thing."
Coffee Could Lower Men's Prostate Cancer Risk
A Harvard School of Public Health study shows that men who drink six cups of coffee a day have a 60% decreased <a href="http://www.huffingtonpost.com/2011/05/18/coffee-can-cut-prostate-c_n_863472.html" target="_hplink">chance of developing a dangerous form of prostate cancer</a>, as well as a 20% decreased chance of developing any other kinds of prostate cancer. The study, published in the <em>Journal of the National Cancer Institute</em>, also shows that just <a href="http://jnci.oxfordjournals.org/content/early/2011/05/17/jnci.djr151.abstract" target="_hplink">drinking just some coffee a day</a> - just one to three cups - could still cut prostate cancer risk by 30%.
Coffee Could Decrease Parkinson's Risk
Drinking <a href="http://www.ncbi.nlm.nih.gov/pubmed/20182023" target="_hplink">a few cups of coffee a day</a> could lower the risk of developing Parkinson's disease by as much as 25%, according to a study published last year in the <em>Journal of Alzheimer's Disease</em>. In that review of studies, which was published in the <em>Journal of Alzheimer's Disease</em>, researchers examined 26 studies that involved 125,000 British people, to find that <a href="http://www.telegraph.co.uk/health/healthnews/7815087/Coffee-can-cut-chances-of-developing-Parkinsons-disease-according-to-new-research.html" target="_hplink">two or three cups of coffee</a> seemed to have the optimal effect, <em>The Telegraph</em> reported.
Coffee Could Ward Off The World's Most Common Cancer
New research presented at the American Association for Cancer Research conference shows that coffee could help to <a href="http://www.huffingtonpost.com/2011/10/24/coffee-most-common-cancer_n_1025089.html" target="_hplink">ward off basal cell carcinoma</a>, the most common cancer in the world. Researchers from Brigham and Women's Hospital and Harvard Medical School found that women who drink three or more cups of caffeinated coffee a day have a 20% lower risk of the skin cancer, while men had a 9% lower risk. Decaf coffee didn't seem to have the same protective effect -- so "our study shows that the inverse association with BCC appears due to caffeine, not other components in the coffee consumption," study researcher Fengju Song, Ph.D., earlier <a href="http://www.huffingtonpost.com/2011/10/24/coffee-most-common-cancer_n_1025089.html" target="_hplink">told HuffPost</a>.
Coffee Could Protect You From Type 2 Diabetes
Drinking coffee is associated with a <a href="http://archinte.ama-assn.org/cgi/content/abstract/169/22/2053" target="_hplink">lower Type 2 diabetes risk</a>, with more coffee consumption linked to a greater decrease in risk, according to an <em>Archives of Internal Medicine</em> review of studies from 2009. In that review, researchers looked at data from more than 450,000 people in 18 studies, and found that for every extra cup of coffee drank a day, a person's risk of Type 2 diabetes decreased by 7%. However, researchers cautioned that "the putative <a href="http://archinte.ama-assn.org/cgi/content/abstract/169/22/2053" target="_hplink">protective effects of these beverages</a> warrant further investigation in randomized trials."
Coffee (Or At Least, The Caffeine!) Can Help You Proofread Better
The caffeine in coffee could actually help you to <a href="http://psycnet.apa.org/psycinfo/2011-23154-001/" target="_hplink">spot grammar errors</a>, according to a new study in the <em>Journal of Experimental Psychology</em>. Researchers found that <a href="http://bodyodd.msnbc.msn.com/_news/2011/10/26/8498728-tank-up-on-java-unleash-your-inner-editor-says-study?ocid=twitter" target="_hplink">caffeine helped students to correct errors</a> in subject-verb agreement and verb tense, MSNBC reported. However, the caffeine still didn't seem to make a difference at identifying misspelled words - sorry.
The benefits of coffee