Is Coffee Good or Bad for You? Your Genes Hold the Answer

By Dr Michael Barnish, Head of Genetics at REVIV

Coffee is the world’s most popular drink. Loved for its bitter buzz, many of us rely on it to get through the day. But is coffee actually good for us?

The debate usually centres around caffeine, not coffee itself. That’s because coffee, as a wholefood, is packed with flavonoids and phytonutrients that can support health in powerful ways. So yes, coffee can be nutrient-dense. But it's not quite that simple.

Dive with us into the science of caffeine, genetics, and personalised health to uncover whether your daily cup is a superfood or a hidden risk.

Coffee plants evolved caffeine as a natural pesticide. This neurotoxin helps protect the plant from insects, but when we drink it, caffeine interacts with our nervous system, cardiovascular system, and even collagen production.

Caffeine can trigger inflammation in blood vessels, which plays a role in plaque build-up. It can also disrupt chemical signalling in the brain, affecting sleep, stress, and focus.

It interferes with collagen synthesis, which may contribute to skin ageing over time. Even skincare products that boast about caffeine’s benefits often just stimulate blood flow temporarily for a short-term glow, without supporting long-term skin health.

So is caffeine bad for everyone? Not necessarily. It depends on your genes.

CYP1A2 is an enzyme that helps break down caffeine in the liver. The speed at which your body produces and uses this enzyme is genetically determined. Some people have a fast version of the gene. Others have a slow one.

Fast CYP1A2 metabolisers clear caffeine quickly. These are the people who can drink espresso after dinner and still fall asleep with no problem. For them, coffee poses less risk, because the caffeine is metabolised before it can do much harm. What’s left behind? A flavonoid-rich drink packed with natural antioxidants.

Slow CYP1A2 metabolisers break down caffeine slowly. For them, caffeine lingers in the body for hours, sometimes all day. This can increase the risk of inflammation, nervous system overstimulation, collagen breakdown, and even cardiovascular strain. These people may feel jittery or anxious after coffee, or have trouble sleeping hours later.

If you’re a slow metaboliser, decaffeinated coffee is generally a better option. It still offers some of coffee’s health benefits, but it's not a perfect solution. The decaffeination process can strip out many of the beneficial compounds found in coffee beans.

So while decaf is a safer choice, it’s not quite the same as that rich, antioxidant-laden cup of regular coffee, especially for those looking for maximum health benefits.

At the end of the day, coffee is neither entirely good nor entirely bad. It all comes down to how your body processes caffeine, and that’s determined by your genetics.

If you love your morning coffee or afternoon tea and want to make smarter choices for your long-term health, a precision genetic test can reveal how your body responds to caffeine, and what lifestyle adjustments you might benefit from.

Discover your CYP1A2 gene type with a precision genetic test at REVIV.
Your personalised roadmap to better energy, skin, sleep, and heart health could start with your next cup of coffee.