It's National Blueberry Muffin Day! Blueberry muffins are my favorite muffin of all time. It is my favorite way to eat blueberries. One cup of blueberries contains about 80 calories, 21 grams carbohydrates, 3.6 grams fiber, and 1 gram of protein. Did you know that blueberries can help fight stress and inflammation? Blueberries are very rich in antioxidants, and they offer a high-fiber, low-calorie fruit option that is also rich in stress-fighting vitamin C.