Low in fat, butternut squash contains significant amounts of dietary fiber, making it an exceptionally heart-friendly choice. It also contains potassium, important for bone health, and vitamin B6, essential for the proper functioning of both the nervous and immune systems. Importantly, the squash is very rich in beta-carotene (which your body automatically converts to vitamin A), which has been shown to protect against breast cancer and age-related macular degeneration, among other health benefits. If that was not enough, a single cup serving provides nearly 50% of the daily recommended dose of vitamin C.