Not the person you replied to, but you might find this comprehensive and plainly worded summary from the NIH interesting: https://www.nia.nih.gov/health/calorie

Not the person you replied to, but you might find this comprehensive and plainly worded summary from the NIH interesting: https://www.nia.nih.gov/health/calorie-restriction-and-fasting-diets-what-do-we-know https://www.nia.nih.gov/health/calorie-restriction-and-fasti... An important caveat to bear in mind is that not all fasting diets entail calorie restriction (though many often do); it is calorie restriction that is linked to reduced inflammation and possible benefits to lifespan.