As someone who treats obesity weight issues for over a decade passion does not equal science . Prolonged fasting can lead to loss of muscle mass, nutritional deficiencies. Worsen eating disorders . She’s right In that it’s good for metabolic health but it’s not for all and the long term data on keeping weight off wjth long fasts has not panned out. For metabolic health it has . Soooo it’s good but it’s not for everyone . She’s not obesity medicine trained . Find specialists at ABOM American board of obesity medicine !