rationalskepticism.org

Sure, you have to apply various factors, like how they chew their food, gut bacteria, or how much refined sugar they eat, but the essential equation stays true. Maybe some people have to have 10% less calories to lose weight, others may need 15%. But nobody gains weight and fat when there's a significant calorie deficit. The woman on the liquid diet can't gain weight unless that weight comes from somewhere, so unless her fecal transplant included enough chlorophyll bodies for her to photosynthesize she'll start losing weight if they further reduce her intake. Assuming "medical supervision" means she never sucked down a bag of Big Macs when no one was watching.

I remember watching a show about weight loss, a woman had her jaws wired shut but was still gaining weight. She was melting Hershey's chocolate bars and drinking them.