Why caffeine doesn't affect some people — Reading comprehension exercise

B1 / B2 / C1
STEP 1
Read the following article: READING COMPREHENSION ARTICLE 39
STEP 2
Answer these questions (choose the best answer):
1. Ultimately, what determines whether or not caffeine affects an individual?
2. Most people will feel caffeine for at least _______________.
3. People with a lot of adenosine receptors are _______________ to the effects of caffeine.
4. According to the research of Ahmed El-Sohemy, what percentage of people are 'quick metabolizers' of caffeine?
5. According to the article, drinking lots of caffeine might actually _______________ adenosine receptors.
—
Did you know? Caffeine sensitivity varies between individuals partly because of genetic differences in how quickly the body processes it. Science articles like this are a good way to build vocabulary for talking about research studies, genetics, and everyday health topics.

Keep Practicing — More Reading Exercises for You: Reading comprehension is one of the best ways to build vocabulary and improve your exam score — try these other passages next.

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