A recent study by a group of South Korean researchers indicates that the amount of caffeine present in coffee and green tea may have a positive impact on the development and growth of brain cancer causing cells. Collecting the data through unidentified animal testing, the researchers found that the caffeine equivalent of two to five cups of coffee or green tea per day suppressed the growth of inositol trisphosphate receptors IP3R), which are closely linked to the most common and aggressive type of brain tumor in humans, the glioblastoma. The researchers note that calcium plays a part in spreading these tumor cells, but the caffeine counteracts it.
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