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With the recent Memorial Day weekend and a host of outdoor cooking activities everyone just enjoyed, here’s a little bit of science knowledge that we’ve all probably wondered about but never got around to answering. Why does grilled food turn black? Well, today you will find out.

Before we delve into the mystery of charred meat, it should be noted that barbequing and grilling are actually two different things. Although the word barbeque is sometimes used to describe any act of outdoor food preparation, “barbeque” actually refers to meat slow-cooked over charcoal or wood. The Memphis in May World Championship Barbecue Cooking Contest, held annually in Memphis, Tenn., defines barbecue even more strictly, as “pork meat (fresh or frozen and uncured) prepared only on a wood and/or charcoal fire.”

Because authentic barbecue is cooked at low temperatures, it rarely blackens, though soot from the wood fire may turn it dark brown.

In contrast, cooking foods on a grill over high heat can lead to a charred crust on your chicken breasts or steak. The black stuff is made by a simple combustion reaction. First, heat creates a browning reaction in amino acids and sugars, food chemist Sara Risch told ScienceNews. If heat is continually applied, the meat will begin to burn. As sugars and proteins burn away, they leave behind blackened, partially-combusted carbon, a common element in all living things.

A little bit of charred carbon can lend a smoky flavor to meat, but a lot can be dangerous. A study presented at the 2006 American Association for Cancer Research meeting found that the chemicals in charred meat raised the risk of prostate cancer in rats, and a 2009 study presented at the American Association for Cancer Research meeting found that pancreatic cancer in humans is linked to consumption of well-done meat. This summer, you might be better off turning down the grill — or firing up the slow-cooker.

Source: Lifeslittlemysteries.

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