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Maybe you're using too much of it. You only need one regular-sized cup of coffee to make you alert - that's an ordinary cup, not a grande Starbucks or super-sized 7-eleven cup! Using too much caffeine can have the opposite effect because it burns up your energy too fast and you end up feeling tired.

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9y ago
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14y ago

"Caffeine" rises your blood pressure...which can lead to nausea and/or dizzyness.

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14y ago

It makes you happy and hiper and a little jittery and in the mood to dance!!!!!!!!!

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13y ago

Caffeine is a stimulant, so it causes dehydration.

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12y ago

It doesn't. Quite the opposite. Caffeine is a mild stimulant

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11y ago

caffine speeds up your heart rate

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Q: Why does caffeine make physical activity hard?
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