My theory is I get a bit hypoglycemic with the typical American breakfast of pastry/bagel/cereal, but I kind-of don't care why.

Bacon is my go-to breakfast food; can cook up a bunch at a time and heat up what I need in the morning. I make some eggs to go with it if I have the time. The great thing about bacon for me is that it's so salty that I cannot overeat on it.