Artificial Food Dyes (Red 40, Yellow 5, Yellow 6)

Red 40, Yellow 5, and Yellow 6 account for 90% of food dyes used in the US. They're made from petroleum derivatives and are in everything from Froot Loops to Gatorade to prescription medications. The EU doesn't ban them outright but requires warning labels: "may have an adverse effect on activity and attention in children." This labeling requirement caused most European food companies to switch to natural colorants voluntarily. The same Fanta sold in the US (with Yellow 6 and Red 40) is sold in the UK with carrot and pumpkin extracts instead. Same brand, different formulation, different continent.