Students are randomly assigned a food additive commonly found in convenience food products (there are 15 total, so two students work on each additive, and before sharing with their peers could compare notes with one another). They use the internet to research the plus, minus and interesting facts about their additive and organize those ideas into the appropriate chart.
The next day, students interact with one another to 'meet' the other 14 food additives. On the second worksheet, students need to decide for themselves if the additive is 'red' (not safe for consumption), 'yellow (okay in moderate amounts), or 'green' (safe to consume). There are three reflection questions about the activity as well. I use this activity with my grade 9's, but with some modifications would be appropriate for a variety of grade levels.