Probably, you have already understood the main principle of this diet because the title speaks for itself: you should eat only soup for breakfast, lunch, and dinner. (samplelover.club)
You must have read my mind... not only a soup round up, but you put two of my favorite soups that I want to learn to make in the round up. (oakhillhomestead.com)
It makes having only a soup for lunch sustainable as I usually need something a bit more dense. (greenkitchenstories.com)