I kind of agree. But I think that part of it comes from common advice here. To just eat less. And your link is exactly why I disagree with it. If you're going through a trial of willpower three times a day than it will probably cave in the face of a peers. And that's what the advice to eat small portions of an unfilling, unhealthy, diet is. Whether at work or at home.  But if you actually look and find foods that are lower calorie that you prefer, find exercise you actually enjoy, than it's not going to happen.