Mushroom soup is one of the most nutritional soups with low calories.
It contains high amounts of vitamin C. It is also very high in niacin. Niacin is a form of vitamin B which helps the digestive system and healthy skin.
3.5 ounces (100 grams) of mushroom soup has 64 calories and it is very low in saturated fat. In spite of its low calorie count, it is very filling and can replace your dinner if consumed with bread or crackers.