Short sleep duration and dietary intake: Epidemiologic evidence, mechanisms, and health consequences. Association between the degree of processing of consumed foods and sleep quality in adolescents. Coffee, caffeine, and sleep: A systematic review of epidemiological studies and randomized controlled trials. Probable insomnia is associated with future total energy intake and diet quality in men. Effects of diet on sleep: A narrative review. You can learn more about how we ensure our content is accurate and current by reading our editorial policy. We link primary sources - including studies, scientific references, and statistics - within each article and also list them in the resources section at the bottom of our articles.
Medical News Today has strict sourcing guidelines and draws only from peer-reviewed studies, academic research institutions, and medical journals and associations. Additionally, the Centers for Disease Control and Prevention (CDC) recommend that people with insomnia avoid caffeine. Some individuals are also more sensitive to caffeine’s effects due to genetic differences, with older adults being more prone than younger adults.Īlthough some studies have shown health benefits from moderate doses of caffeine, the Food and Drug Administration (FDA) has recommended that healthy adults limit their consumption to less than 400 milligrams (mg) per day, the equivalent of 4–5 cups of coffee.Ĭonsuming caffeine in excess can cause nausea, dizziness, dehydration, headaches, restlessness, rapid heartbeat, insomnia, and anxiety. Additionally, the substance increases wakefulness and arousals. Caffeine is also present in chocolate, tea, energy drinks, and soda, such as cola.Ī 2017 systematic review combined evidence from several clinical trials and found that caffeine prolongs the time it takes to fall asleep, reduces total sleep time, and worsens sleep quality. Many people consume caffeine, for example, in the form of coffee, to help them wake up in the morning. Share on Pinterest Stefania Pelfini, La Waziya Photography/Getty ImagesĬaffeine is a drug that stimulates the central nervous system.
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