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.

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

From Science Daily • May 13, 2026

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

From Science Daily • May 13, 2026

Researchers say there are several reasons why very high caffeine intake may stop being beneficial.

From Science Daily • May 13, 2026

Studies show that doses as low as 40mg-60mg may improve mood and alertness in middle-aged adults who normally consume little or no caffeine.

From Science Daily • May 13, 2026

“She’s not supposed to drink caffeine yet,” Dad says.

From "Liar & Spy" by Rebecca Stead