This may be an argument against breakfast for the sedentary, but athletes on extended training programs usually need to eat in the morning. You're much more likely to hit the wall on an empty stomach, a few hours into your training.
That's totally true, but I would argue the second half of your statement covers approximately 5% of the U.S. population, while the first half covers the other 95%.
I'd also add that I am an amateur long-distance runner and just completed a medium distance run after fasting all day and performed fine. Had it been a race, probably less so. But the myths of caloric necessities have been greatly exaggerated.
That is very much unsubstantiated, all kinds of athletes enjoy and thrive training fasted. It's probably much more complex in what's best for whom than just "much more likely to hit the wall". Type of metabolism, levels of fat adaption, type of activity, length of activity, etc all matters.
As an personal anecdote, I enjoy climbing in the mornings before having food, that's a few good hours of intermittent sprint type activity.
Sure it's more complex, but it you're still more likely to hit the wall. Also, correct me if I'm wrong but climbing isn't quite as cardiovascular as cycling for instance, and I'd be hard-pressed to find an endurance athlete who can survive with no breakfast.
Not just athletes but also people who exercise better in the morning.
I have to head out running before 06:00 ( ex-farm border collie dog still has early-rising demands ) so need to eat about 05:30. On a couple of occasions I overslept and skipped breakfast. It was terrifying, I barely had enough energy to make it back home and was shaking. All my body wanted when I returned was sugar, now.
So in my case at least a bowl of museli / milk / yoghurt and a banana is the minimum possible breakfast.
You can escape from this it you want. I'm mostly on ketogenic diet now, no sugar whatsoever and only minimal carbs-- I'm just leaving for a 20k run, and most probably I won't be hungry when I return.
