Caffeine and High Blood Pressure.
If we take too much caffeine it can cause nervousness and jitters and palpitations. It may also increase your blood
Caffeine and High Blood
What are common sources
of caffeine, Caffeine is a mild stimulant found in tea, chocolate, coffee and also in many soft
drinks. If we take too much caffeine it can cause nervousness and jitters and palpitations. It may
also increase your blood pressure. The amount of caffeine in two to three cups of coffee can raise
systolic pressure 3 to 14 millimeters of mercury (mm Hg) and diastolic pressure 4 to 13 mm Hg in
individuals without high blood pressure.
Individuals who don't take
caffeine on a regularly, caffeine can cause a temporary but sharp rise in blood pressure.
Exactly what causes this spike in blood pressure is unknown. Some researchers suggest that
caffeine narrows blood vessels by blocking the effects of adenosine, a hormone that helps keep
them widened. Caffeine may also stimulate the adrenal gland to release more cortisol and
adrenaline, which cause your blood pressure to raise.
Some studies have found that
individuals who regularly drink caffeine have a higher average blood pressure than those who
drink none. Other research has suggested that regular takers of caffeine develop a tolerance to
it — and as a result, caffeine doesn't have a long-term effect on their blood
In another study, a 12-year
study of 155,000 women found that drinking caffeinated cola may be associated with an increased
risk of high blood pressure. However, the same causal relationship was not found with
caffeinated coffee. In fact, the study suggested that women who drink caffeinated coffee may
actually have a reduced risk of high blood pressure.
Similarly, a recent (2007)
study shows that women who drinks 6 cups of caffeinated coffee a day have lower risks of high
blood pressure than do women who drink three or fewer cups daily. The same study found that men
and women who never drink coffee also have lower risks of high blood pressure.
As a precaution, some doctors
recommend limiting caffeine to 200 milligrams a day — about the same amount as in two 12-ounce
cups of brewed coffee. Keep in mind that the amount of caffeine in coffee and soft drinks varies
by brand. Also, avoid caffeine right before activities that naturally increase your blood
pressure, such as weightlifting or hard physical labor exercise.
To observe if caffeine might be raising your blood
pressure, check your blood pressure within 30 minutes of drinking a cup of coffee or another
caffeinated beverage you regularly take. If your blood pressure increases by five to 10 points, you
may be sensitive to the blood-pressure-raising effects of caffeine. If you plan to reduce your
intake of caffeine, do so gradually over several days to a week to avoid withdrawal symptoms like
What are common sources of Caffeine
Learn how much
caffeine there is in coffee, cola drinks, chocolate, medications, and diet pills. Source from:
Clifford J. Stratton, “Caffeine—The Subtle Addiction,” Ensign, June 1988, 60.
Product / Caffeine (in milligrams)
Coffee (6 oz. cup) Drip 175 Percolated 132 Instant regular 64 Decaffeinated 3 Cola Drinks (12 oz) Coca-Cola Classic 46 Coca-Cola, new 46 Coke Free 0 Pepsi 43 Pepsi Free 0-2 Carob (chocolate substitute) 0 Nonprescription drugs Caffedrine capsules (each) 100 NoDoz tablets (each) 100 Weight-control aids Dexatrim (daily dose) 200 Dietac (daily dose) 200 Prolamine (daily dose) Dr. Pepper 38 Mountain Dew 52 Tab 50 Jolt 71 44 oz. cup of Coke/Pepsi 169/158 Tea (5 min. brew, 6 oz) 24-60 Cocoa and chocolate Cocoa beverage (water mix, 6 oz) 18 Milk chocolate candy bar (8 oz) 48 Baking chocolate (1 oz) 35 White chocolate 0
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