The average Granny Smith apple, which is 3.8 ounces, has 14.8 grams of carbohydrates. This is 5 percent of an individual's daily value of carbohydrates based on a 2,000 calories diet.
It also has approximately 3.1 grams of fiber, 63 calories and 10.5 grams of sugar. It has 130.8 milligrams of potassium and 5.5 milligrams of calcium. Granny Smith apples also have 0.5 grams of protein per 3.8 ounces. They are rich in vitamin C.
Granny Smith apples are a great source of antioxidants, and may help regulate blood sugar. Granny Smith apples may also help maintain healthy and clean teeth.