What is the worst food additive?

I take attendance by having the students answer a question.

What is the worst food additive?

• sugar
• salt
• coloring
• oil
• that thing in cheetoes that's killing orangutans
• "artificially flavored" anything
• MSG
• aspartame
• sugar alcohols
• creatine
• bacon
• mustard
• pepper
• carrots
• durian
• insects
• beetles
• maggots
• bricks
• cement
• cyanide

I have taken the liberty of sorting these from most likely to be added to a food to least likely. For some pairwise comparisons, I guessed.

I have no idea what the deal is with orangutans, but you can find out.

This post's theme word is olid, "foul-smelling." What olid horrors have you added to this soup stock?