Overcooked food
We need to clarify this one because the link between overcooked food and cancer is not very clear yet. Cooking food at very high temperatures and letting it burn may contribute to forming a molecule called acrylamide. This molecule is a known carcinogen when synthesized in the industry. However, it is not known whether or not its effects are really as bad as we suppose. Thus, try not to overcook your food to prevent cancer, but don’t feel forced to turn down burnt food. At least not because of cancer.