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Why Caffeine Gives some People a Boost of Energy, While Others Barely Notice It

Summary by KOHA.net
"For me, coffee just doesn't have a big effect," says Emily, 20, as she leaves a cafe in central London. "I usually drink two cups a day and sometimes an energy drink. Then I can drink Coca-Cola all night and feel completely...

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IPCA: coffee accumulates a drop of almost 17% in the last 12 months "Coffee simply doesn't have much effect on me," says 20-year-old Emily, leaving a coffee in central London at the end of the afternoon. "I usually take two cups a day and maybe an energy drink too. And then I can drink Coca-Cola all night long and feel perfectly fine." We all have a friend like Emily. The one who can have a double espresso or even an energy coffee at night and s…

·Rio de Janeiro, Brazil
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Center

Scientists say it all depends on caffeine consumption habits, lifestyle and a factor we have no control over: our genes.

·London, United Kingdom
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For some, a cup of coffee in the evening is almost imperceptible, and for others, even morning caffeine can affect well-being and sleep - and it's not just a matter of habit.

"For me, coffee just doesn't have a big effect," says Emily, 20, as she leaves a cafe in central London. "I usually drink two cups a day and sometimes an energy drink. Then I can drink Coca-Cola all night and feel completely...

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KOHA.net broke the news on Friday, September 18, 2026.
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