Caffeine: Truths and Myths
It suddenly seems as though there’s a new coffee shop on every corner, selling highly caffeinated drinks packed with sugars and fat. As a society, we are going from drinking 1-2 cups of coffee a day to 1-2 cups – three or four times a day. It’s the new comfort food, especially in cold weather.
In order to make it in today’s fast-paced world, you’ve got to stay focused with plenty of energy – both physical and mental energy. It’s easy to see why your body craves caffeine in the short term, especially if you’re sleep deprived and feeling down.
As energy levels dip because of an overstressed lifestyle, though, have you ever wondered what all that caffeine is doing to your brain?
World’s Most Widely Used Psychoactive Drug
Granted, caffeine can lead to temporary increased alertness, and sports medicine research does promote it as an athletic performance enhancer under certain conditions. However, excessive caffeine every day also constricts blood flow to your brain and many other organs.
A daily cup of joe is probably not a problem, but more than 3-4 cups of caffeine, which is metabolized in your hard-working liver, may raise a few issues.
Adenosine is a chemical in the brain that causes drowsiness by slowing down nerve cell activity – and it’s the key to understanding caffeine addiction. When we are tired, adenosine triggers the brain to slow down so we will go to sleep and naturally rejuvenate our own brain function.
Caffeine blocks the effects of adenosine by occupying the adenosine receptor sites and preventing the brain from seeing it. So even if you are tired and in need of sleep to revitalize brain chemistry, caffeine tricks the brain into thinking it is wide awake.
Additionally, caffeine causes the release of adrenaline from the adrenal glands, putting the body into a stressful “fight or flight” mode, whereby:
- Your pupils dilate
- Your heart beats faster
- Blood vessels on the skin constrict to slow blood flow from cuts
- Blood flow increases to working muscles
- Blood pressure rises
- Blood flow to the stomach slows
- Your liver releases sugar into the bloodstream for extra energy
- Muscles tighten up, ready for action
Caffeine also increases dopamine levels in the same way that amphetamines do. Dopamine is a brain neurotransmitter that activates the pleasure centers of the brain. While caffeine’s effects are far less than amphetamines, it is a similar process.
Long-term Addictive Use of Caffeine Bad for Your Brain?
Excessive caffeine use is associated with chronic dehydration (which can harm your body in numerous ways), added stress on your heart, high blood pressure, jitteriness and headaches, says Daniel Amen, M.D.
Truth is, depending on your own body chemistry, when the effects of the caffeine wear off, you can actually feel fatigued and depressed. So, you consume more caffeine to re-energize. Soon enough, you are hooked on the stuff – and it takes more and more to achieve that same feeling.
After years of studying brain scans at Amen Clinics, it is clear that reduced cerebral blood flow is the opposite of what you want for optimal brain function, says Dr. Amen. “In fact, decreased cerebral blood flow lowers cognitive function and can exacerbate emotional and mental health problems.”
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