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.
However, too much caffeine consumption can cause a range of side effects. For most people, about 300 mg of caffeine a day is a healthy level of caffeine consumption. That is roughly equivalent to three cups of coffee. However, it is important to recognize that caffeine levels vary widely in coffee, tea and other caffeine-containing substances.