What chemical in coffee is harmful?

Online Answer
Roasted coffee beans contain small quantities of a compound called acrylamide. In high amounts, acrylamide can be harmful. There are even concerns that it may also cause cancer.
Related Questions 📌
Decreasing cooking time to avoid heavy crisping or browning, blanching potatoes before frying, not storing potatoes in a refrigerator, and post-drying (drying in a hot air oven after frying) have been shown to decrease the acrylamide content of some foods (7, 8).