You can train hunger response. I used to fast for a full 24 hours, water only. It was difficult at the beginning, but a few months in and I wouldn't even feel all that hungry. The bouts of hunger that would come only lasted an hour or so, then I would be fine. This benefit has continued, even though I haven't purposefully fasted for years. Not eating just generally doesn't bother me anymore. If I'm in a rush to get to lunch, it's usually because I want to get out of the office for a bit...