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Jun 21, 2023 · Here are 9 side effects of too much caffeine. 1. Anxiety. Caffeine is known to increase alertness. It works by blocking the effects of adenosine, a brain chemical that makes you feel tired. At...
- Franziska Spritzler
- You Can Feel the Effects of Adenosine Again. Adenosine is naturally made in the body and acts as a neurotransmitter, depressing the central nervous system and telling the brain when to rest.
- You’ve Got High Sleep Debt. Sleep debt is the measure of how much sleep you owe your body over the last 14 nights. It’s measured against your sleep need, the genetically determined amount of sleep you need.
- You Have Caffeine-Related Sleep Loss. As we explained above, high sleep debt may be the reason why you’re feeling so sleepy. But caffeine may actually be making this worse.
- You’ve Developed Caffeine Tolerance. Caffeine may not be making you feel tired, it just may not be making you feel as awake as it used to. That’s because your body can actually develop a tolerance to it, meaning you need more and more to feel the same stimulating effects.
- Dara Katz
- You’re Drinking Too Much of It. How many cups of coffee, cans of Red Bull or pots of tea are you having a day? More than three? That might explain why you’re getting tired; it’s a lot of caffeine.
- Excess Caffeine Blocks Adenosine Receptors. When caffeine hits our brain, Worley explains, it adheres to your brain’s adenosine receptors. Adenosine is what helps us feel sleepy.
- The Sugar You Add Is the Real Culprit. There are two types of people in this world: People who take some sugar in their coffee and people who take some coffee with their sugar.
- It Could Be Mold. Ew. We know. However, studies show that caffeine contains mold called mycotoxins, which according to the World Health Organization are “are toxic compounds that are naturally produced by certain types of moulds (fungi).
- Digestive Issues. Caffeine is a drug, and consuming too much for your body can overstimulate your central nervous system, leading to what's called caffeine intoxication.
- Irritability and Anxiety. Caffeine gives you that wake-up effect because it blocks adenosine, a chemical in your body that makes you feel tired, Dr. Posina explains.
- Headache. The funny thing about caffeine is that it's both a treatment for headaches and a cause of them. Advertisement. You'll find caffeine added to headache and migraine meds, as it helps constrict blood vessels to ease head pain, per the National Headache Foundation.
- Fatigue. You expect that it'll perk you up, but drinking too much coffee can cause "rebound fatigue," Dr. Posina says. Advertisement. "You feel really energized after drinking caffeine, but when the effects wear off, you have this rebound that leaves you much more tired.
More than 400 milligrams (about 4 cups) of caffeine is too much. Drink lots of water, take a walk, practice deep breathing and wait it out. If you experience an irregular heartbeat or feel dizzy or faint after caffeine, go to the emergency room.
Apr 9, 2024 · Too much caffeine – either over the course of the day or in one large dose (like in some energy drinks) – can sometimes cause unwanted side effects. These could include anxiety, restlessness, an irregular heartbeat, or insomnia .
Mar 12, 2024 · People drink coffee for its ability to increase alertness. However, for some people, coffee makes them more tired. This is likely due to caffeine blocking the receptors of a chemical found in human cells called adenosine. It may also be due to poor sleep habits or the development of caffeine tolerance.
