The amount of caffeine in just one cup of coffee could be enough to harden a person's arteries for several hours afterward, according to a study presented last week at the European Society of Cardiology Congress. Hardened arteries put extra pressure on the heart and increase the risk of heart attack and stroke.
The researchers from Greece gave a group of 10 healthy volunteers either inactive placebo capsules or capsules containing 100 milligrams of caffeine--a quantity equivalent to one small cup of coffee. On another day, the volunteers received the opposite capsule from the previous dosage. Neither the volunteers nor the testers knew the sequence in which the volunteers had been given the capsules.
Caffeine consumption caused an increase in wave reflection--a measure of arterial stiffness
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