People who eat meals and diets with low energy density tend to eat fewer calories.
Low energy density diets such as vegetables and fruits have a common property that they contain lots of water.
Similarly, adding water to the food to make a soup is another great option to make your meal low energy density.
According to a study, eating the same quantity of soup as solid food can make people feel fuller and they tend to eat fewer calories.
Vegetable soups, due to their high water content, can be beneficial for losing weight. However, make sure to avoid adding fats into the soup such as cream or coconut milk.