How does the roast level affect caffeine content in coffee?

The caffeine content in coffee is influenced by the roast level due to the chemical changes that occur during the roasting process. Lighter roasts typically retain a higher concentration of caffeine compared to darker roasts. This is primarily because the longer the beans are roasted, the more caffeine is lost through the heat. Although the difference in caffeine levels may not be huge, lighter roasted beans can have a slightly higher caffeine content on a per gram basis.

Additionally, as coffee beans are roasted, they undergo various physical and chemical transformations. Darker roasts not only lose some caffeine but also tend to have a different flavor profile due to the breakdown of compounds, which can affect how we perceive the strength or intensity of the coffee.

Other factors, such as brewing time and method, also impact the final caffeine content in the cup. However, the inherent difference in caffeine levels between light and dark roasts is a vital consideration for baristas and coffee aficionados.