So far, research has revealed promising results. One study published last year divided 100 people, all free of disease, into two groups. For three months, participants either ate whatever they wanted, or consumed between 800 and 1,100 calories for only five days out of the month — a pattern researchers refer to as a “fasting mimicking diet” or “FMD.” At the end of the study period, participants on the FMD who were at risk for disease saw their fasting glucose, an indicator of diabetes risk, return to normal. Markers for heart disease, along with high levels of cholesterol and triglycerides, decreased, as did levels of the 1GF1 marker of various cancers. Additionally, participants lost abdominal fat, while preserving lean muscle mass and metabolism, which is often sacrificed on a lower calorie diet.
As someone how is notorious for forgetting to eat this all sounds good to me.