I looked at something several years ago showing an idea of Longo's fasting mimicking diet's contents. As near as I recall from so long ago it was low in calories but high in carbohydrate. Not sure what that's about, as I wouldn't think of something raising insulin levels as mimicking fasting. I would think maybe something more like Dr. Atkin's fat fast from way back when would be more like mimicking a fast but with some food than insulin raising carbs.