Common sense tells me there are, as our distant ancestors spent time fasting involuntarily…
But let’s see:
Eating for 12 hours and then fasting for 12 hours is likely safe for most people, Longo explains. “That pattern of eating is very common among people who have record lifespans,” he says. “It seems to match both science and tradition.”
https://newsinhealth.nih.gov/2019/12/fast-or-not-fast