I suspect you have good intentions with this article but you might be confusing brain fog, in it's proper clinical and frankly debilitating sense, with being tired.

Brain fog, for those that suffer it, cannot be cured with simply walking or eating breakfast. It's causes could be autoimmune dysfunction, cancer, infection and others. It's massively debilitating because it impacts your ability to think and even engage with other people. Be careful with implying that people that genuinely suffer in this way can be cured with trivial behaviour changes.