The main rule when it comes to losing weight is to cut some calories. With soups, it is possible. Most of the home-made soups have more water and not too many ingredients. You can eat more soups than any solid food. The water content will fill you faster than the typical meals.
When preparing the soup, use low oil. Do not add additional cream or coconut milk. This will keep the sneaky calories in check and make them low-calorie weight loss foods.