That works fine when your appetite isn't being suppressed through drugs, sickness or being in ketosis. Ketones naturally suppress your appetite. There have been times where I have literally gone from morning to dinnertime without eating and was still not hungry. That's not a good thing. Your body needs a steady supply of fuel or it starts conserving what it has when more fuel isn't coming in. The act of eating in and of itself is a metabolism stimulator which is why eating smaller more frequent meals can help keep your metabolism cranked up instead of shutting it down by skipping meals or only eating one meal a day.