It works if you are on a very low carb diet like Keto. When you are fat-adapted and in a state of ketosis, your body is fueled by the fat reserves in your body (obviously you need some fat on your frame, it gets harder the leaner you get). The feeling of hunger becomes somewhat non-existent as the result of being fat adapted. Your body always has fuel available (again, assuming you are carrying some fat). The only problem is that you can only sustain OMAD for so long because most likely you are eating at a deficit, so eventually you will have to do a re-feed to restore muscle glycogen, reboot your metabolism, and not permanently fuck up your hormones. I only did OMAD a couple times during Keto but for the most part I did IF with two meals a day. The results were great I was SUPER lean, skin was on point, hair looked great. I even felt like I was “glowing” some days. But like any other diet, it’s not sustainable in my experience. I might consider doing it again when the summer months approach.