Caffeine-laden energy drinks -- sold as Monster and Red Bull, to name two -- have been linked to heart, nerve and stomach problems, according to researchers.
After 90 minutes, the internal diameter of blood vessels tested was dramatically smaller, on average, than before, the investigators found.
touted as increasing energy and was originally extracted from bull semen -- hence the name Red Bull, the researchers said.According to Dr. David Katz, director of Yale University's Yale-Griffin Prevention Research Center,"Endothelial function is, in general, a potent indicator of cardiovascular risk."
That being said, the combination of sugar and stimulants in these drinks has no proven benefit, Katz added.
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