A number of studies show if consuming warm soup can help suppress the appetite. But it is not a cream soup vegetable soup, but yes and chicken bouillon with home-made clear.
The reason, because in one bowl of soup, there is a fairly complete nutrition. Starting from carbohydrates from potatoes, fiber and vitamins from vegetables, and protein from the chicken. Plus more when dining in a warm State, the stomach will not be surprised and you can feel comfortable during the Suhoor.