Butternut squash is a winter squash that contains about 45 calories per 100 grams of squash. Butternut squash is an excellent source of vitamin A, B-complex vitamins, minerals and fiber, according to Nutrition-and-You.com.
Butternut squash is rich in the B-complex vitamins of folates, riboflavin, niacin, vitamin B-6, thiamin and pantothenic acid. It also contains abundant minerals, including iron, zinc, calcium, potassium and phosphorus. Butternut squash is a good source of fiber and contains many antioxidants. This squash has no saturated fats or cholesterol and is often recommended for weight loss programs, Nutrition-and-You.com states.
The seeds of butternut squash also are laden with several minerals and vitamins. Their protein, fiber and monounsaturated fatty acids make them very beneficial to heart health, according to Nutrition-and-You.com.