caffeine

noun

caf·feine ka-ˈfēn

ˈka-ˌfēn

: a bitter alkaloid C₈H₁₀N₄O₂ found especially in coffee, tea, cacao, and kola nuts and used medicinally as a stimulant and diuretic

Examples of caffeine in a Sentence

Her doctor told her to avoid caffeine.

Recent Examples on the Web For reference, a single shot of espresso contains about 63 mg of caffeine, which puts his drink at close to 400 mg of caffeine in total. —

Zoey Lyttle, Peoplemag, 29 Sep. 2023 Alcohol, caffeine, carbonated drinks, dairy products, and spicy foods might worsen nausea.12 5. —

Cynthia Sass, Mph, Rd, Health, 28 Sep. 2023 Women can prioritize their sleep health by adhering to sleep hygiene practices, like sticking to a sleep schedule and limiting caffeine intake. —

Dominique Fluker, Essence, 27 Sep. 2023 People should know that caffeine can be a serious problem to someone whose heart can’t take it. —

Amy Dickinson, Anchorage Daily News, 17 Sep. 2023 Too much caffeine has short-term side effects like headaches, anxiety, irritability, muscle tremors and a rapid heartbeat. —

USA TODAY, 10 Sep. 2023 Some research has suggested that caffeine may contribute to weight loss, and green tea specifically may help with weight loss and weight management, according to a 2009 study. —

Emilia Benton, Women's Health, 31 Aug. 2023 Consuming alcohol or caffeine can temporarily increase your heart rate, which explains that jittery feeling, and dilate blood vessels, which explains the warmth. —

Cassie Shortsleeve, Men's Health, 28 Aug. 2023 The extra boost of caffeine on a long theme park day didn’t hurt, either. —

Esther Carlstone, Parents, 12 Sep. 2023 See More

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'caffeine.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.