Smoothy Slim
Smoothy Slim
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Consuming 200 milligrams or more of caffeine per day-roughly equivalent to two cups of coffee-can either increase or decrease a woman's estrogen level, depending on her ethnic background and the source of the caffeine, a study from the National Institutes of Health (NIH) finds.
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Learn More »Consuming 200 milligrams or more of caffeine per day—roughly equivalent to two cups of coffee—can either increase or decrease a woman’s estrogen level, depending on her ethnic background and the source of the caffeine, a study from the National Institutes of Health (NIH) finds. Between 2005 and 2007, the researchers followed 259 premenopausal women for up to two menstrual cycles. They collected fasting blood specimens for hormonal assessment at up to eight visits per cycle and four 24-hour dietary recalls per cycle. They calculated the participants' total caffeine intake based on how much coffee, black tea, green tea, and caffeinated soda they consumed. Overall, the participants ingested an average of 90 milligrams of caffeine per day. In the study, Asian women who consumed more than 200 milligrams of caffeine per day had increased levels of estrogen compared to those who consumed less caffeine, but Caucasian women who consumed more than 200 milligrams of caffeine per day had decreased levels of estrogen. African American women who consumed more than 200 milligrams of caffeine per day experienced a slight rise in estrogen levels, but the increase was not statistically significant. However, the effect of caffeine consumption on estrogen levels varied based on the source of the caffeine. Consumption of more than one cup per day of caffeinated soda or green tea was linked to increased levels of estrogen in all participants, regardless of race or ethnic background. And increased consumption of caffeine in the form of coffee was associated with elevated estrogen levels in Asians, decreased estrogen levels in Caucasians, and no statistically significant change in estrogen levels among African Americans. "Short term, these variations in estrogen levels among different groups do not appear to have any pronounced effects," Enrique Schisterman, PhD, of the Division of Epidemiology, Statistics and Prevention Research at the Eunice Kennedy Shriver National Institute of Child Health and Human Development, where some of the research was conducted, said in an NIH press release. "We know that variations in estrogen level are associated with such disorders as endometriosis, osteoporosis, and endometrial, breast, and ovarian cancers. Because long term caffeine consumption has the potential to influence estrogen levels over a long period of time, it makes sense to take caffeine consumption into account when designing studies to understand these disorders." The study appears in the February issue of the American Journal of Clinical Nutrition.
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A scrumptious morning smoothy based on the diets of among the healthiest, longest-living hamlet in the world.
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