For decades, coffee was considered less than healthy. However, the evidence today tells a very different story. As cutting-edge research continues to reveal its wide-ranging benefits, Garfield Kerr, CEO of Mokha 1450, tells us why coffee is back in the spotlight for all the right reasons.

Coffee is the world’s first functional beverage. Simply put, a functional beverage provides physiological benefits beyond basic nutrition, often supporting cognitive performance, energy metabolism or relaxation.

One of the earliest documented uses dates back to 15th-century Yemen, where Sufi communities reportedly consumed coffee to maintain alertness during long hours of prayer.

Setting the record straight

For many decades, coffee was considered unhealthy and believed to have negative effects. These included claims such as stunted growth and irritability. However, there was scant scientific research underpinning these perceptions. Additionally, the limited scientific papers that detractors could cite were riddled with small sample sizes and other methodological flaws. Consequently, their conclusions on coffee’s health effects were largely untrustworthy.

It wasn’t until the 1990s and 2000s that meta-analysis of earlier studies began to shift perceptions. Specifically, researchers found there were likely far more health benefits in coffee than previously thought. In turn, this spurred a wave of new studies that have since identified coffee as an overwhelmingly healthy beverage.

What’s in the cup

Plant-based ingredients that are key to most functional beverages almost all have caffeine in common. These include green tea, yerba mate and guarana. Caffeine is a naturally occurring plant alkaloid. A mild stimulant, it belongs to the methylxanthine class of psychoactives. These are stimulant compounds derived from purine base, found in coffee, tea and chocolate. Examples include caffeine, theophylline and theobromine. Methylxanthines act primarily as antagonists of adenosine receptors. They can also inhibit phosphodiesterase enzymes. Both mechanisms contribute to increased alertness and stimulation of the central nervous system.

Each cup contains numerous bioactive compounds, including chlorogenic acids and other polyphenols. These exhibit antioxidant activity and may contribute to some of coffee’s observed health associations. In turn, they help to reduce oxidative stress by neutralizing free radicals and offer liver and kidney protection. Additionally, they inhibit the growth of certain unhealthy bacteria in the gut microbiome.

Functional benefits

So, what are the primary functional benefits of a simple cup of black coffee? For those focused on fitness, the benefits are considerable. For instance, coffee has been shown to aid cardiovascular performance, increase alertness and improve reaction time. It also supports fat oxidation at rest and during exercise, while accelerating muscle glycogen resynthesis. Perhaps less well known is that it can reduce perceived exertion and increase pain threshold during exercise, as well as suppress appetite and elevate mood.

Beyond performance, the long-term health evidence is equally compelling.
• Heart health: a significantly reduced risk of heart attack, stroke, heart failure and coronary heart disease
• Reduced disease risk: a lower risk of type 2 diabetes, liver diseases including liver cancer, pancreatic cancer and cirrhosis
• Neuroprotective effects: a lower risk of Parkinson’s, Alzheimer’s and dementia
• Mortality: a reduced overall risk of death
• Mental health: a reduced risk of depression

A market on the rise

Coffee’s functional credentials sit within a rapidly expanding global market. Today, the global functional beverage market is valued at approximately USD 355 billion. Moreover, it is projected to grow to around USD 490 billion by 2034. With a burgeoning consumer market of this size, there are myriad functional beverage categories to choose from. These range from energy drinks and others that promote focus and concentration to those supporting weight loss and enhancing athletic ability.

The case for black coffee

I would argue that a simple cup of black coffee is by far the most versatile, healthiest and safest option. This is because it provides all of the benefits found in a functional beverage without several of the downsides. Given that the safe limit is between three and five cups per day, coffee is also much more difficult to abuse than most people believe. Notably, most consumers generally fall well below the upper threshold of what is considered safe consumption. Yet many are under the misconception that the recommended daily limit is well below this number. In contrast, many energy drinks contain large amounts of sugar and B12, alongside other additives that have not been scientifically studied in depth to show efficacy or safety. Furthermore, consuming too many drinks within a number of these categories carries risks that moderate to high consumption of coffee does not entail.

The emerging frontier

The latest research on coffee’s positive effects on the gut microbiome is especially intriguing. The gut microbiome consists of microorganisms, including bacteria, archaea, fungi and viruses, that live in the digestive tract. Considered by many to be the next frontier of science, research suggests it could unlock many technological advances long sought after in medical science, such as living longer and healthier lives with full mental acuity. Consequently, this could lead to cures for multiple diseases, particularly with the help of artificial intelligence (AI).

Agnese Santanatoglia, a postdoctoral researcher specializing in food chemistry, coffee science and human health, offers a compelling scientific perspective. “Coffee is far more than a simple source of caffeine,” she told me. Indeed, she described it as a remarkably complex chemical system, rich in bioactive compounds including chlorogenic acids, melanoidins, diterpenes and other polyphenols. These contribute not only to its physiological effects but also to its distinctive sensory profile, shaped by the roasting and brewing process.

New perspectives on consumption

In our discussion, Santanatoglia also pointed to emerging research on how coffee-derived compounds may interact with the gut microbiome. While the field is still developing, early studies suggest certain coffee components may influence microbial composition and metabolic activity. “This emerging area of research is opening new perspectives on how coffee consumption could contribute to broader aspects of human health and wellbeing,” she added.

While the science and our general understanding of coffee’s role as a functional beverage keeps evolving, one thing remains clear. Ultimately, coffee
is the most accessible, efficacious and ubiquitous functional beverage the world has ever known.