Insta Keto The 20-minute rule is a common way to prevent overeating. The idea behind it is that the stomach only sends an 'I am full' signal to the brain after twenty minutes. The fast eaters among us (who eat a meal within twenty minutes) may have already eaten more than they actually need. But what is actually true of that 20-minute rule?Why is this so important to know?In 2016, almost half of the Dutch adults were overweight. http://www.karstcountry.com/