Diet soda glycemic index
Diet soda has no measurable glycemic index: a 250 ml serving (1 glass) has only 0.8 g of available carbohydrate, so its glycemic load is about 0 and it barely raises blood sugar on its own.
Also known as: Diet Coke, Coke Zero, zero sugar soda
- Serving250 ml
- Available carbs0.8 g
- Fiber0 g
- Sugars0 g
- Protein0.3 g
- Calories5 kcal
Serving: 1 glass.
What to know
Diet and zero-sugar sodas contain no digestible carbohydrate, so they have no GI and do not raise blood sugar directly.
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Frequently asked questions
Does diet soda have a glycemic index?
Not a measurable one. GI can only be tested in foods with enough carbohydrate: the test needs a 25 or 50 g carbohydrate portion. Diet soda has 0.3 g per 100 g, so its direct effect on blood sugar is minimal and its glycemic load is about 0.
Does diet soda raise blood sugar?
Barely, on its own. What matters more is what you eat it with: bread, rice, potatoes, sauces or sugary drinks. Pairing carbohydrate foods with protein, fat or fiber tends to soften the rise.
How many carbs are in diet soda?
A 250 ml serving has about 0.7 g of total carbohydrate, including 0 g of fiber, leaving 0.8 g of available carbohydrate (the part that raises blood sugar). Per 100 g: 0.3 g of carbohydrate.
Nutrition facts
| per 100 g | Serving (250 ml) | |
|---|---|---|
| Calories | 2 kcal | 5 kcal |
| Carbohydrates | 0.3 g | 0.7 g |
| Available carbs | 0.3 g | 0.8 g |
| Fiber | 0 g | 0 g |
| Sugars | 0 g | 0 g |
| Protein | 0.1 g | 0.3 g |
| Fat | 0 g | 0.1 g |
Source: USDA FoodData Central, Beverages, carbonated, low calorie, cola or pepper-type, with aspartame, contains caffeine (SR Legacy, FDC 175099). Available carbohydrate = total carbohydrate minus fiber.
Sources: Atkinson FS, Brand-Miller JC, Foster-Powell K, Buyken AE, Goletzke J. International tables of glycemic index and glycemic load values 2021: a systematic review. Am J Clin Nutr. 2021;114(5):1625–1632. USDA FoodData Central. How we calculate each value: Methodology & sources.
Data last reviewed 2026-09-29.