I'm a dietitian. You would think I'd subscribe to the breakfast idea. Well, it may be true for some, but I'm just not hungry in the morning. I have coffee, always, then need about 2 hours till I'm hungry. I believe, strongly, that we should eat when we are hungry, physically hungry. At about 2 hours after waking, I want cereal and milk, almost always.
Of course, if I'm anxious or upset, I find it hard to eat. Still, I know that I'll need food and try to have something. Smooth creamy foods are easiest for me when I'm upset.
So, my "breakfast" is really a "snack".