I didn't know heavy cream was used in soups.  Do you have a recipe you could post here?  I would consider experimenting with a coconut oil based soup if I was over weight.  I'd use curry powder, pepper, ginger, coriander, tumeric, garlic and onion powder, salt (of course), a little sugar, and potatoes cut into small pieces (after being boiled to soften).  Dessicated coconut might work out well in that soup also.