caffeine

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Once stimulation becomes too high, whether from stress, anxiety, or too much caffeine, performance begins to decline.

From Science Daily • May 13, 2026

These neurotransmitters naturally become less active with age and in diseases like Alzheimer's, so caffeine may help counteract that decline.

From Science Daily • May 13, 2026

One possibility is that the body processes caffeine differently at higher doses.

From Science Daily • May 13, 2026

Excessive caffeine can also interfere with sleep and increase anxiety, both of which may negatively affect brain health.

From Science Daily • May 13, 2026

And I can't help but think: maybe Tiny Cooper should fry his brain with caffeine more often.

From "Will Grayson, Will Grayson" by John Green and David Levithan