Acorn squash is not only delicious, but it is healthy too. Acorn squash contains vitamins A, B6 and C. This squash also contains niacin, potassium and magnesium. Acorn squash is a low calorie food with an entire squash only having around 175 calories. Feel free to indulge in acorn squash, it is a guilt free veggie with a marvelous flavor!