When I was able I would fast for 3 days a month. Just water nothing else. It's more doable to maintain a lower weight. I believe you have to find a way to fast regularly. my sister in law who is thin fast 2 days a week. and the rest of the time eats under 500 calories a day. Basically one meal a day. When I was young I did the one meal day thing. Fasting and binging is your problem you have to fast consistently. Even my mom at 73 fasts consistently to maintain her weight.