Coffee and The Brain
If you are a coffee drinker, a genuine coffee enthusiast even, you have probably come across your share of unsolicited advice about how much is too much, or too little. This post is not going to do that. As psychologists, we pride ourselves on approaching the evidence with curiosity rather than judgement, and research has quite a lot to say about coffee. What is particularly interesting is what happens between your morning cup and your brain.
Why the brain is the right place to start
The brain interacts with every stimulus you encounter. If you are like most people, coffee shows up multiple times in your day, which means your brain is consistently processing this particular input and responding to it. Understanding the brain's response to coffee, therefore, is central to understanding what coffee actually does to you.
How caffeine works in the brain
Caffeine directly influences the production of adrenaline, cortisol, and dopamine, all well-known hormones that oversee a long list of bodily functions. But more specifically, caffeine interacts with adenosine receptors in the brain. These receptors are designed to receive adenosine, a hormone that signals the body to relax and wind down. When caffeine is absorbed in place of adenosine, the result is increased alertness, wakefulness, and readiness. Caffeine mimics adenosine so closely that the effect is remarkably potent.
Recent research has also found that the mix of active chemicals in coffee interacts with the brain in ways that may actually protect it from ageing. Coffee is the primary food source of antioxidants for a large portion of the world's population, and these antioxidants protect against brain damage from ageing and disease. Notably, decaffeinated coffee contains the same level of antioxidants as caffeinated coffee, and the same benefits have not been replicated through tea. This suggests that chemicals beyond caffeine are responsible for much of what coffee does.
The brain genuinely responds well to coffee
There is a reason coffee can feel addictive: it creates a neurological response in the brain that feels rewarding. Research has shown an inverse association between coffee consumption and mortality, cancer, and diabetes, on top of existing evidence pointing to reduced risk of Alzheimer's disease and other forms of cognitive decline among those with higher caffeine intake. The stimulating effects of coffee, increased energy, sharper alertness, and better concentration, are well established, as are the potential downsides of excess, including insomnia and restlessness.
The gut microbiome has received a great deal of attention for the role it plays in mental wellbeing. A specific type of gut bacteria that supports immune function is also supplemented through coffee consumption. This benefit, like many others, appears to come from the unique chemical composition of coffee rather than caffeine alone. Understanding how sleep, biology, and daily habits interact with mental health is something our team thinks about a great deal.
Final thoughts
Coffee is one of those rare pleasures that research tends to smile upon, at least within reasonable consumption. The brain's relationship with your morning cup is more complex and more fascinating than most people realise. If you are curious about how daily habits, including nutrition, sleep, and stimulant use, affect your mental health and wellbeing, our team at Contemporary Psychology in St Kilda is here to help.