Men’s Health mentioned Valter Longo about his studies on how a fasting-mimicking diet can help individuals live longer. “Well, the regeneration that fasting triggers is remarkable,” he says. “During abstention, organs like the liver, as well as the entire immune system, shrink because they are deemed less necessary. When the body rebuilds these systems, however, it activates the release of healthy stem cells which regenerate newer, younger, more functional versions.”