What’s in 100g of blueberries?

According to USDA food data, 100g of raw blueberries provides about 57 calories, 14.5g of carbohydrate, 10g of natural sugar, 2.4g of fiber, 0.7g of protein, and 0.3g of fat. It also contains small but useful amounts of micronutrients, including vitamin C, vitamin K, and manganese.

A 100g portion is roughly 3.5 ounces and is a little under 3/4 cup for many people, though the exact volume can vary depending on berry size. If you log food by weight, grams are more accurate than cups because blueberry size and packing density can change the cup measurement.

Why blueberries are a strong nutrition choice

Blueberries are best known for their antioxidants, especially anthocyanins, the pigments that give them their deep blue color. These compounds are associated with cardiovascular and metabolic health in research, and blueberries are often studied as part of an overall fruit-rich eating pattern.

They also offer fiber, which supports fullness and digestion, plus vitamin C for immune and collagen support and vitamin K for normal blood clotting and bone health. Blueberries are naturally sweet, so they can satisfy a dessert craving with far fewer calories than most sweets.

How 100g fits into daily eating

For most people, 100g of blueberries is a practical snack portion or a fruit add-on to yogurt, oatmeal, cottage cheese, or a smoothie. It is also a useful serving size if you are counting carbs for weight management or diabetes meal planning, because the carbohydrate content is moderate and the fiber helps slow digestion.

If you're active, blueberries can work well before or after a workout when paired with protein or healthy fat. For example, blueberries with Greek yogurt or a protein shake can be more satisfying than fruit alone. If you use an app like Fitnit for home workouts, pairing your nutrition tracking with consistent training can make it easier to stay on target.

Best ways to eat, store, and compare them

Fresh blueberries are great raw, but frozen blueberries are also nutritious and convenient. Freezing does not make them unhealthy; it simply makes them easier to store and portion. Choose unsweetened frozen berries when possible to avoid added sugar.

Store fresh blueberries unwashed in the refrigerator and rinse them right before eating to help reduce spoilage. When comparing labels, check whether the product is raw, frozen, sweetened, or dried, because 100g can mean very different calorie and sugar amounts depending on the form.

Tips

• Weigh blueberries in grams if you want the most accurate calorie and carb count.
• Pair 100g of blueberries with protein, such as yogurt or eggs, for better satiety.
• Choose fresh or unsweetened frozen blueberries instead of sweetened dried versions when you want fewer added sugars.
• Rinse berries just before eating, not before storage, to help them last longer.
• If you're using blueberries around workouts, keep your training consistent and track form and reps carefully; tools like Fitnit can help with at-home exercise logging.