I think a lot about lead, chromium and arsenic in food. Mainly because I use a lot of spices like cinnamon and turmeric, which are infamous for using lead to enhance color to increase the appearance of quality in food. But on the other hand, the health benefits of eating good quality food, and using spices like cinnamon and turmeric both for taste and health benefits outweight any disadvantages. Processed foods will kill you certainly with all the fats and sugars, small amounts of lead, chromium, arsenic and other metals are far less harmful.