Recent News: The Deep. Natalie Farrow was recently cast on Freeform's new pilot The Deep. They are waiting to see if it get's picked up, Catch Natalie Farrow's interview, talking all things iZombie and what it was like to play Ginger.
Caffeine can increase blood pressure; long term consumption at sufficiently high doses has been associated with chronic arterial stiffness. Blood pressure increases are mediated by adenosine receptor antagonism. Caffeine can cause vasoconstriction. It is unclear if caffeine causes increased heart rate as a side effect.
Amount and Sources. Most adults can consume 200 mg to 300 mg of caffeine per day, which translates to two to four cups of coffee, without any health concerns or negative side effects.nce you start drinking four or more cups of coffee, or otherwise consuming 500 mg to 600 mg of caffeine daily, you are more likely to experience the ill effects of caffeine. Coffee is one of the most abundant sources of caffeine, although other consumable items contain the drug.