How does environmental humidity affect coffee roasting?

• A. It has a negligible impact
• B. It influences roasting time and flavor development
• C. It only affects the bean size
• D. It increases the energy required to roast

Answer: (B)

Environmental humidity plays a significant role in the coffee roasting process, particularly in how it influences roasting time and flavor development. When humidity levels are high, beans may retain more moisture, which can affect their temperature and how they react under heat during roasting. This additional moisture can slow down the roasting process, as the roaster has to expend more energy to evaporate the extra water content in the beans before they begin to roast properly.

Moreover, this moisture content impacts the Maillard reaction and caramelization processes, both crucial for flavor development. If the roasting environment is too humid, it may lead to a different profile of flavors in the finished coffee, potentially altering acidity and sweetness, among other characteristics. Therefore, understanding and controlling environmental humidity is essential for achieving the desired outcomes in roasting quality and flavor profile.