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.
Substances in the coffee beans do make it into the final drink. In fact, coffee contains several biologically active substances that can affect metabolism: 1  Caffeine â a central nervous system stimulant.  Theobromine and Theophylline â substances related to caffeine that can also have a stimulant effect.