Digestive biscuits glycemic index
Digestive biscuits has a glycemic index of 59, which is medium. A 25 g serving (2 biscuits) has a glycemic load of 11 (medium).
Also known as: digestives, graham crackers
- Serving25 g
- Available carbs18 g
- Fiber1.4 g
- Sugars5.7 g
- Protein1.4 g
- Calories97 kcal
Serving: 2 biscuits.
What to know
Digestive biscuits have a medium GI. Despite the name and the whole wheat, they contain added sugar and fat, so two biscuits is a sensible serving.
Glycemic load by portion size
GI stays the same whatever you eat, but glycemic load scales with the amount: eating twice as much doubles the effect on blood sugar.
| Amount | Available carbs | Glycemic load | |
|---|---|---|---|
| 50 g | 36 g | 21 | High |
| 100 g | 72 g | 43 | High |
| 25 g · 2 biscuits | 18 g | 11 | Medium |
What the studies found
The value of 59 is the median of 5 published measurements in the International Tables of Glycemic Index (2021). Results are fairly consistent (39 to 62).
Each dot is one study. Green dots followed the ISO 26642 standard method.
- 39 · UK 2006
- 56 · Canada 1983
- 59 · Canada 1981
- 59 · UK 2000
- 62 · Canada 1992
Digestive biscuits compared with other sweets & desserts
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Frequently asked questions
Is digestive biscuits low glycemic?
No. With a GI of 59, digestive biscuits is in the medium range (56 to 69). Low GI is 55 or less.
What is the glycemic load of digestive biscuits?
A 25 g serving (2 biscuits) has a glycemic load of 11, which is medium. Glycemic load combines GI with the amount of carbohydrate in the portion: 10 or less is low, 11 to 19 medium and 20 or more high.
Can people with diabetes eat digestive biscuits?
With a GI of 59 and a medium glycemic load per serving, digestive biscuits can be part of a diabetes-friendly diet with attention to portion size and pairing it with protein, fat or fiber. Everyone responds differently, so talk to your doctor or dietitian about your plan.
How many carbs are in digestive biscuits?
A 25 g serving has about 19 g of total carbohydrate, including 1.4 g of fiber, leaving 18.1 g of available carbohydrate (the part that raises blood sugar). Per 100 g: 78 g of carbohydrate.
Nutrition facts
| per 100 g | Serving (25 g) | |
|---|---|---|
| Calories | 386 kcal | 97 kcal |
| Carbohydrates | 78 g | 19 g |
| Available carbs | 72 g | 18 g |
| Fiber | 5.7 g | 1.4 g |
| Sugars | 23 g | 5.7 g |
| Protein | 5.7 g | 1.4 g |
| Fat | 5.7 g | 1.4 g |
Source: USDA FoodData Central, Cookies, graham crackers, plain or honey, lowfat (SR Legacy, FDC 174083). 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.