Caffeine is a drug that acts as a stimulant to the heart and central nervous system, and is also known to increase blood pressure in the short term, although there is no conclusive evidence of long-term effects on blood pressure.
The effects on blood pressure are most likely when caffeine is taken in excessive quantities or by highly sensitive people. In particular, people who are hypertensive (have habitual high blood pressure), are advised to avoid caffeinated drinks, while pregnant women are advised to limit their intake of caffeinated drinks to less than 300mg per day.
The effects on blood pressure are most likely when caffeine is taken in excessive quantities or by highly sensitive people. In particular, people who are hypertensive (have habitual high blood pressure), are advised to avoid caffeinated drinks, while pregnant women are advised to limit their intake of caffeinated drinks to less than 300mg per day.
Food --------------------------------------- Caffeine content
Instant Coffee (mg/cup) -------------------------- 61 to 70
Percolated ground Coffee (mg/cup) ----------- 97 to 125
Tea (mg/cup) -------------------------------------15 to 75
Cocoa (mg/cup) -----------------------------------10 to 17
Chocolate bar ------------------------------------60 to 70
Cola drinks (mg/12oz can) ----------------------43 to 65
Got this information from bbc website so must be correct. Gives an idea of how much caffeine is being consumed with every cup.
3 comments:
I had thought tea had more caffeine than coffee. Am I wrong?
Pound for pound, tea has more caffeine than coffee, but you get 200 cups of tea per pound versus 50-60 cups of coffee per pound. Therefore, tea has 1/3 - 1/2 the caffeine per cup. Black tea has 40-60 milligrams of caffeine per 8 oz. serving. Coffee has 100-120 milligrams.
That's very interesting! And thats why that shot of espresso is so much more effective than our good old chai.
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