Light, medium or dark roast: what's the difference?

If you're new to specialty coffee, it's normal to look at “light roast”, “medium roast” or “dark roast” and think: ok... but what does that change in practice? And then another classic question arises: which one is stronger? Which one has more caffeine?

Roasting is basically the process of "cooking" green coffee. That's where the coffee gets its flavor. And the longer the coffee stays in the roaster, the darker it gets, simple.

But here's the interesting part: the darker the roast, the more the coffee's flavor comes from the roast... and less from the bean itself.

In other words, in a darker roasted coffee you will taste more "intense", more bitter, more "heavy" flavors, that classic profile that many people associate with commercial coffee. In a lighter roast, the coffee retains much more of what makes it unique: sweeter, more acidic (in a good way) and more complex notes. This is where flavors of fruit, cocoa, citrus, flowers start to appear... things that many people don't even associate with coffee.

In practice, there is no better or worse. There is what you like. But there's an important detail: in specialty coffee, the roast isn't meant to hide flaws, it's meant to show the best of each origin. That's why you'll see many more light to medium roasts.

Now, about that "intensity": what you see on supermarket packages (intensity 8, 10, 12...) isn't exactly strength in the real sense. It's usually more linked to the roast level. The darker it is, the more "intense" it seems, but that comes from the bitterness and not the caffeine.

And here's something that surprises many people: light roast and dark roast have practically the same amount of caffeine.

The difference you feel has more to do with how you make the coffee (espresso, filter, etc.) and the amount you use, the resistance of the extraction, than with the roast itself.

So why is supermarket coffee almost always dark? Simple: it's more stable and better hides lower quality coffees. It's roasted more to standardize the flavor and extend its shelf life.

In specialty coffee, the logic is the opposite. It's made with fresh, higher quality coffee, and roasted lighter so as not to destroy what the coffee already has that's good.

If you're starting with premium coffee, the tip is simple: start with medium roasts or more balanced, easy-to-drink blends, with sweetness and little bitterness. As you explore, try lighter roasts and different origins. That's where coffee really starts to open up.

Ultimately, this isn't about light vs. dark. It's about realizing that coffee can have much more flavor than you're used to.

And once you realize that, there's no turning back.