I don’t think any of OP‘s coworkers were around in Roman times or pre-industrial revolution, so to them and to everybody who is alive right now, the concept of OMAD without a doctor supervision is a relatively new concept. I’m not sure why you brought up religious fasting, as that’s only for a few days or weeks at a time and not for dietary purposes. Because OP is not 200 or 2000 years old and is not fasting for religious purposes, I’m a little bit lost as to why you brought any of this up, it’s not relevant to what OP said or to what I said. I’m simply trying to explain what OP’s coworkers might be thinking, and I highly doubt they are comparing OP‘s diet to that of the ancient Romans…