Milk and Diabetes: Carbs, Glycemic Index and Portions
A cup of 2% milk has about 12 g of carbohydrate (12 g net). Glycemic index: low (26 to 34). Yes, in measured portions. Milk contains natural sugar (lactose), so a glass counts as a carbohydrate serving.
A cup of cow’s milk has a little over a dozen grams of carbohydrate, almost all from lactose, whatever the fat level. It also brings protein and calcium, so it is a nutritious food worth counting rather than avoiding.
Plant milks vary widely. Unsweetened almond and soy milks usually have much less carbohydrate; oat and rice milks can have more than cow’s milk, and flavored versions add sugar.
Carbs in milk by portion
| Portion | Grams | Carbs (g) | Fiber (g) | Net carbs (g) | Protein (g) |
|---|---|---|---|---|---|
| cup | 244 | 12 | 0 | 12 | 8.1 |
| 100 g (for comparing foods) | 100 | 4.8 | 0 | 4.8 | 3.3 |
Source: USDA FoodData Central, FDC ID 171267 (Milk, 2%). Net carbs here means carbohydrate minus fiber. “Net carbs” is not an FDA-defined term, so total carbs are shown too. Values are estimates for a typical item; brands, ripeness and size vary.
Glycemic index and glycemic load
GI ranks how fast a food raises blood glucose compared with pure glucose (100). Low is 55 or less, medium 56 to 69, high 70 or more. Full-fat and reduced-fat milk gave similar low values. Glycemic load multiplies the index by the available carbohydrate in a portion (carbs minus fiber), so it reflects how much you actually eat: low is 10 or less, medium 11 to 19, high 20 or more.
Which published values we used (4)
| Entry | Food as listed | GI |
|---|---|---|
| Suppl. Table 1, #937 | Full-fat, milk | 30 |
| Suppl. Table 1, #938 | Full-fat, pasteurized, fresh, organic milk (Arla, UK) | 34 |
| Suppl. Table 1, #942 | Milk, reduced fat (Dairy Farmers Ltd, Australia) | 26 |
| Suppl. Table 1, #943 | Milk, semi-skimmed, pasteurized, organic (Arla, UK) | 34 |
Atkinson FS et al. International tables of glycemic index and glycemic load values 2021. Am J Clin Nutr 2021;114(5):1625-1632. Glucose reference (glucose = 100); values from studies that used white bread were converted by the authors. Where studies differ we show the range, not an average.
Glycemic index is only one piece of the picture. The same food can give a different response depending on ripeness, cooking, what you eat it with and your own body, so your meter or CGM is the best guide.
How milk fit the plate method
Milk count toward the carbohydrate quarter of the plate in the plate method, along with grains, starchy vegetables, fruit and milk. The CDC describes the plate method as half non-starchy vegetables, a quarter protein and a quarter carbohydrate foods. See the diabetic meal plan guide for how it works, or drop milk onto a meal in the meal planner to watch the plate fill.
Portion ideas and pairings
- A half to one cup at a time.
- Use it in coffee in a splash, not a pour.
- Chocolate and strawberry milk have added sugar on top of lactose.
Pairs well with: unsweetened cereal or oatmeal, a handful of nuts, eggs for breakfast.
Related foods
Cheddar cheese
1 oz slice: 1 g carbs
Banana
1 medium: 27 g carbs
Apple
cup, quartered or chopped: 17 g carbs
Sweet potato
cup, cubes: 27 g carbs
See all foods and the low glycemic foods list
Frequently asked questions
Is skim or whole milk better for diabetes?
Carbohydrate is about the same. The choice depends on the rest of your diet and your care team’s advice about fat.
How many carbs are in a cup of 2% milk?
About 12 g of carbohydrate, of which about 0 g is fiber, so roughly 12 g net carbs. Values are from USDA FoodData Central for 244 g and are estimates; brands and sizes vary.
Information only, not medical advice. Your care team may set different targets for you, and only a lab test ordered by a clinician can diagnose diabetes or prediabetes. See our medical disclaimer.
Sources
- USDA FoodData Central: Milk, 2% (FDC ID 171267)
- Atkinson FS et al. International tables of glycemic index and glycemic load values 2021. Am J Clin Nutr 2021;114(5):1625-1632
- CDC: Diabetes Meal Planning (plate method and carbohydrate counting)
- ADA Standards of Care in Diabetes—2026, Section 5: Facilitating Positive Health Behaviors
Last reviewed: by the Diabetes Blogs editorial team. Information only, not medical advice.
