Vitamin A also aids in night vision. Squash is a low-calorie food that also provides calcium, phosphorus and potassium. Most squash originated in the tropical regions of South America and the Andes. Historians believe that they were domesticated for the food value of their seeds first and their flavorful flesh second. Hard-shell gourds were used to hold water and food as well.
Winter squash differ greatly in shape, color and size.