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If there is an association between coffee drinking and osteoporosis, most people suspect it would be due to the caffeine. One study showed a lower bone mineral density in women who consumed more than 450 mg of caffeine daily. While the evidence suggests that women who consume 5-6 cups...
 
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A study of hibiscus tea on blood pressure (BP) was presented at the American Heart Association’s 2008 meeting in New Orleans. Dr. Diane L. McKay at Tufts University conducted a randomized placebo-controlled, double-blind study of 65 people ages 30 to 70 with systolic BP between 120 to 150 mmHg...
 
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Caffeine has long been known to elevate blood pressure (BP). A well-designed study examined the impact of 250 mg of caffeine in subjects who had consumed no coffee in the previous 3 weeks. This study found caffeine increased BP by an average of 14/10 mmHg an hour after consumption. A clinical trial of patients with ... Coffee, Caffeine and Hypertension
 
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The regular consumption of tea has been repeatedly associated with a reduced risk of cardiovascular disease (CVD) and at least several types of cancer. A recent study in Japan followed over 12,000 people 65 to 84 for over 5 years. They found that the risk of dying from CVD...
 
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There is already convincing evidence that people who drink more tea suffer fewer heart attacks and strokes. Some of the phytochemicals found in tea might help prevent and/or slow the progression of at least several types of cancer. Epidemiological data have fairly consistently found that people who drink more...