Does eating burnt food cause cancer? My friend thinks that eating over-cooked food causes caner. He thinks that the burnt, black portions of the bread (e.G., burnt toast) or a burnt potato skin can cause (stomach) cancer in the long run. Should I cut of

Possibly. There is concern that eating burnt foods can increase your risk for developing certain types of cancer.
There. There are studies that show that your friend is right. Charred meat has chemicals that are known to cause cancer. This is usually meat that has been cooked at a high heat over a barbecue. The best things to do are to cook meat over a lower heat if you are grilling, do not put meat right on the flames, and do not eat charred portions of beef.