Caffeine isn't even in the same category. But don't put on a fresh pot without brewing about some important disclaimers. Mungall says there are certain people who ought to consume caffeine carefully. Because caffeine constricts cardiac muscles, people with heart conditions should use it in moderation. Similarly, people with sleep disorders and high blood pressure should limit or exclude caffeine from their diet, he says.
Doctors often advise patients with ulcers or anxiety disorders to avoid caffeine.
Mungall also said research has indicated women with hereditary cystic breast disease should shun caffeine, and that large amounts of caffeine may also trigger episodes in those who suffer from seizure disorders. And common sense would tell most people who suffer from any kind of bowel or cramping syndrome to use caffeine carefully, Mungall said. Caffeine stimulates the production of an enzyme that acts as a receptor for adrenaline, Mungall said. Caffeine also dilates bronchial tissue and increases respiratory rates. Mungall said caffeine has been used in asthma therapy, particularly in premature infants who may occasionally stop breathing, a condition call apnea.