* 4 for breakfast as toast
* 4 for lunch to make 2 sandwiches (1 sandwich would be too small and I would be hungry all afternoon)
* sometimes another 2 with soup or an evening snack.
"Give us this day our daily bread", the old prayer goes: because bread was food, and everything else was accompaniment.
Bread became ubiquitous because it didn’t require hunting or gathering, i.e. it supported ever growing communities of stationary humans. Not because some ancient nutritionist decided it was good for you.
If you get the majority of calories from bread then you are, at best, eating far from the optimal amount of protein and lacking some useful nutrition. At worst, you’re eating a poorly balanced diet that will lead to overeating or malnourishment (or both).