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In a Nutshell

For most of my life, I was an avid coffee drinker. My go-to order at the coffee shop was a hazelnut latte with almond milk, and it kept me feeling good and energetic all day. On days I felt like saving $8, I'd brew hot black coffee in my French press at home. Then, my 30s hit me like a bus, and my body started to change. One of the biggest shifts: I could no longer handle coffee or espresso without jitters, anxiety, and digestive issues. So now I drink tea every day.

Turns out, caffeine can affect the body in many different ways, and the potential risks of drinking it depend on a few factors. How so, you ask? Keep reading and find out below.

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Be well,
Morgan Mandriota
Newsletter Editor, Healthline

Written by Morgan Mandriota
March 30, 2026 • 3 min read

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How does caffeine affect your body?

Caffeine does so much more than just keeping you awake. It's a central nervous system stimulant that affects your body in numerous ways.

Drinking coffee is linked with lower levels of body fat and a lower risk of depression and type 2 diabetes. However, knowing the risks of overcaffeinating and its long-term effects on your body may make you think twice about having that third or fourth cup of coffee.

Heart health: Caffeine can be a concern if you have a preexisting heart issue. You may notice arrhythmias whenever you consume caffeine, or it can cause increased blood pressure.
Digestive health: A daily cup of coffee may help keep you regular, but drinking too much can lead to irregularity (aka diarrhea). It can also lead to nausea, heartburn, or vomiting.
Reproductive health: Some women who consume too much caffeine may experience fertility issues. If you're pregnant, the American College of Obstetricians and Gynecologists recommends consuming less than 200 milligrams (mg) per day to reduce the risk of miscarriage, which equals about one 12-ounce cup of coffee.
Cognitive health: The stimulating effects can cause alertness and temporarily relieve drowsiness and fatigue. On the flip side, too much caffeine can overstimulate the brain, leading to confusion or headaches.

So, what is a healthy amount of caffeine consumption? According to the FDA, it's safe for most healthy adults to consume up to 400 mg per day. As you consume the same amount of caffeine daily, your body develops a tolerance to it. Other factors, like your age, body mass, and overall health, can also influence your tolerance level. Pay attention to your body and note how you feel, then adjust your intake as needed.

To learn more about how caffeine can affect your health and ways to drink safely, check out our full guide (complete with a handy visual breakdown!) below.

MORE SIDE EFFECTS

☕ Over to you: How does caffeine affect you? And what's your go-to drink? Email us at wellnesswire@healthline.com to share your experience with us.

Did you know...

How Much Caffeine Is In Your Favorite Drink?

Caffeine content varies widely, depending on the drink, serving size, and how it's brewed — sometimes more than you'd expect. Visit Healthline on Instagram to see just how much caffeine is in your brewed coffee, espresso, matcha, and other go-to drinks.

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Every product we recommend has gone through either Healthline's or Optum Now's vetting processes. If you buy through links on this page, we may receive a small commission or other tangible benefit. Healthline has sole editorial control over this newsletter. Potential uses for the products listed here are not health claims made by the manufacturers. Healthline and Optum Now are owned by RVO Health.

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Until next time,

Take care of yourself, and we'll see
you again soon!

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Every product we recommend has gone through either Healthline's or Optum Now's vetting processes. If you buy through links on this page, we may receive a small commission or other tangible benefit. Healthline has sole editorial control over this newsletter. Potential uses for the products listed here are not health claims made by the manufacturers. Healthline and Optum Now are owned by RVO Health.