To achieve an anti-inflammatory diet, these are the biggest, baddest sources of free radicals out there. Start limiting these and feel better fast! Quick Links: What are free radicals? 1. Industrial Fats and Oils, and most burned things 2. Nitrate Cured Meats 3. Chemicals The Chemical Watch List 4. Refined Sugar and Excess Carbohydrates Bonus Watch Item: Microplastics What are free radicals? Free radicals are damaged molecules caused mainly by heat or chemical reactions.