Scientists in Spain analyzed data from over 100,000 people and found a stark pattern: higher intake of acrylamide, a chemical formed when starchy foods are browned or burnt, was linked to a dramatic rise in cardiovascular events and deaths. Those consuming the most faced a 33–66% higher risk of dying from heart-related causes, and in people already vulnerable, like those at risk of type 2 diabetes, that danger soared to 84%. Acrylamide quietly appears in everyday favorites—toast, roast potatoes, breakfast cereals, coffee, even homemade and restaurant meals.

Yet this isn’t a call for panic, but for small, consistent changes. Experts advise aiming for a light “golden yellow” rather than dark brown or black when toasting or frying. One slice of toast averages just 4.8 micrograms of acrylamide, and moderation matters far more than perfection. You don’t need to abandon breakfast—just stop burning it.