Coincidentally tigger, in biology last term, we did an experiment where we gave caffeine to water fleas and had to measure their heatrate using a microscope (their bodies are see-through so you can sea the heart beating!).
Two cups of coffee contains 30 mg of caffeine. This is enough to raise your blood pressure and pulse rate significantly. So 30+30=60mg which equals 4cups of coffee 1cup of coffee is 15mg, So 60+15=75mg of caffeine. This right here tells you that if two cup of coffee raises your blood pressure and pulse rate then five cup is really not a good idea for you to drink.
Tigger that is making assumptions about what is a cup of coffee. There is a huge difference between expresso for example and a cup of instant coffee which can be any strength. Also what size is the cup.
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