Sometimes strokes can destroy the area of the brain that controls hunger. They require alarms to consistently eat, sleep, etc. I remember one story about a guy who put all these alarms on his watch. One day, his watch runs out of batteries, so his alarms stop completely. A couple days later, he calls the hospital because he couldn’t get out of bed. Turns out he hadn’t eaten anything the whole time. In short, you’ll probably forget to eat without any signal you have to.