Strategy to Steal: Fill up on broth. Participants of the Cabbage Soup Diet sip on the low-calorie soup several times a day for one week to shed pounds. And, yes, you may lose weight. “But it’s usually water, not fat; since cabbage is a natural diuretic,” explains Molly Morgan, registered dietitian and author of the new book The Skinny Rules. Still, supplementing your diet with low-calorie soup can be a smart strategy. “Research shows that broth-based soup fills you up, helping you eat less at meals. And that can reduce your overall calorie intake and lead to real weight loss.” In fact, a recent study found that people who consumed two 10-ounce servings of broth-based soup daily while on a reduced calorie diet lost almost twice as much weight as those who followed the same diet sans soup.