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.
Too Much Caffeine. Consuming too much caffeine can cause chest pain, chest tightness and an increased heart rate. Caffeine affects people differently, depending on weight, normal caffeine consumption and other medical conditions. MayoClinic.com states that the average adult can consume between 200 to 300mg of caffeine daily without causing any harm. If you drink 500mg or more, you may develop adverse reactions, such as chest pain.