About 50 lbs from my heaviest (200 -> 150, or a quarter of my peak body weight). I would say I had an eating disorder before the weight loss -- I frequently ate my emotions and booze and sugar were a big part of that behavior. High quantities of sugar and alcohol make it very easy to consume calories while still feeling hungry. As my relationship to food became one of sustenance rather than consumption, the weight naturally came off.

Encouraging this shift is largely how eating disorders are treated; though in my case it came as a result of dealing with a lot of trauma that I had buried. But ultimately it's about holistic emotional and physical health, and reframing your relationship to food in that context.