Quick answer
No meaningful processing difference. Diet Coke uses aspartame; Coke Zero uses aspartame + acesulfame potassium. Both are Level 4 with identical industrial ingredient categories. Pepsi ingredients in their zero-sugar line are comparable, using the same types of artificial sweeteners and industrial additives.
Processing levels can vary significantly between brands and specific products within each category. Always check the ingredient list of the specific product you are considering. Use our product search to look up exact processing scores. These comparisons evaluate processing level and ingredient composition only. They do not account for taste, price, convenience, cultural significance, or individual dietary needs.
How do they compare by the numbers?
Sample products from each
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Frequently asked questions
Is Diet Coke or Coke Zero less processed?
Neither has a meaningful health advantage over the other. Both are zero-calorie, zero-sugar, and equally ultra-processed. They differ in sweetener blend and flavor profile, not health impact.
Is caffeine free Diet Coke less processed?
No. Caffeine free Diet Coke has the same processing level as regular Diet Coke. Removing caffeine does not reduce the number of industrial additives, artificial sweeteners, or caramel color. All variants remain Level 4 ultra-processed.
How does Pepsi vs Coke compare for zero-sugar options?
Pepsi Zero Sugar and Coke Zero use nearly identical ingredient categories: carbonated water, caramel color, artificial sweeteners, phosphoric acid, and natural flavors. Pepsi ingredients in their zero-sugar line include the same types of industrial additives. From a processing standpoint, all zero-sugar colas are Level 4 regardless of brand.