How does coffee and caffeine affect the body?
In this episode of Health Recoded, we break down the science behind caffeine, coffee, and how your morning coffee affects the brain, gut, nervous system, hormones, anxiety, sleep, and overall health.
If you’ve been experiencing anxiety after coffee, gut issues, jitters, fatigue, poor sleep, appetite changes, or feeling overstimulated after caffeine, this episode will help you understand what is happening physiologically inside the body.
Many people don’t realize that caffeine affects nearly every major system in the body, including:
the nervous system
cortisol and stress hormones
gut function and digestion
sleep and recovery
mood and anxiety
appetite and metabolism
In this episode, we explain the anatomy and physiology behind caffeine, what happens when you drink coffee on an empty stomach, how caffeine interacts with stress physiology, and practical nursing perspectives on safe daily caffeine intake.
We cover:
How caffeine affects the brain and nervous system
Adenosine, dopamine, and caffeine physiology
How caffeine increases cortisol and stress signaling
Why coffee can worsen anxiety and overstimulation
Why coffee affects digestion and bowel movements
Coffee, appetite suppression, and blood glucose changes
How caffeine impacts sleep and recovery
Safe daily caffeine intake recommendations
Common myths and misconceptions about coffee
Practical tips for healthier caffeine consumption
If you’re looking to improve your energy, nervous system regulation, gut health, sleep, or relationship with caffeine, this episode gives you a science-based and approachable place to start.
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Chapters:
00:00 Intro
00:26 Daily caffeine intake
01:42 How does caffeine affect the body?
03:30 Does caffeine increase cortisol?
04:45 Does caffeine cause anxiety?
05:59 Is caffeine addictive?
07:21 Does caffeine cause fatigue?
08:29 Why does coffee make you poop?
10:44 Does caffeine suppress appetite?
12:53 Does coffee worsen sleep?
15:00 Common misconceptions about coffee
17:25 Nursing tips for daily caffeine intake
22:23 Key Takeaways
This content is for educational and informational purposes only and is not a substitute for guidance provided by your own medical professional.
Resources:
Coffee & Health — Debunking Coffee Myths
https://www.coffeeandhealth.org/health/media-content/information-campaign/debunking-coffee-myths-the-truth-behind-your-brew
National Institutes of Health — Caffeine Overview
https://www.ncbi.nlm.nih.gov/books/NBK223808/
FDA — How Much Caffeine Is Too Much?
https://www.fda.gov/consumers/consumer-updates/spilling-beans-how-much-caffeine-too-much
Sleep Foundation — Caffeine and Sleep
https://www.sleepfoundation.org/nutrition/caffeine-and-sleep
Harvard T.H. Chan School of Public Health — Coffee
https://nutritionsource.hsph.harvard.edu/food-features/coffee/
American Academy of Sleep Medicine — Caffeine Effects on Sleep
https://sleepeducation.org/sleep-disorders/caffeine-and-sleep/
Temple, J. L., et al. (2017). The Safety of Ingested Caffeine: A Comprehensive Review
https://pubmed.ncbi.nlm.nih.gov/28675917/
Glade, M. J. (2010). Caffeine — Not Just a Stimulant
https://pubmed.ncbi.nlm.nih.gov/20182054/
Nehlig, A. (2010). Is Caffeine a Cognitive Enhancer?
https://pubmed.ncbi.nlm.nih.gov/20182035/
Fredholm, B. B., et al. (1999). Actions of Caffeine in the Brain
https://pubmed.ncbi.nlm.nih.gov/10484644/
