My father used to love to recite the following verse in a fake English accent, "It ain't the 'eavy 'aulin' that 'urt the 'orses 'ooves. It's the 'ammer, 'ammer, 'ammer on the 'ard 'ighway." Believe it or not, there is an application to eating disorder recovery.
Perhaps one could say, "It ain't the gaining weight that causes all the stress, it is the feelings of anxiety one feels on the way to the higher weight." Many people in recovery will say, "If I could wake up tomorrow and have gained all the weight, I would be fine. It is the agonizing process of gaining it slowly that is so hard."Just like the story of the horse in which people thought it was the heavy load that hurt its feet, it is easy to get focused on gaining weight as the stumbling block. In reality, for most people, it is the anxiety and uncertainty caused by weight gain that slows the process, not the weight gain itself. As in the story of the horse, the solution is not the obvious. In order for the horse to feel better, it needs to walk on softer ground rather than carry a lighter load. In the process of weight gain, the focus needs to be on the management of feelings, not the weight itself. The crossroads is not "to gain weight or not to gain weight", rather "it is to feel or not to feel".
The same principle applies to stopping purging behaviors in bulimia or stopping the overeating in binge eating disorder.