Most people don't eat a breakfast with multiple things most days, just a quick meal before work (or they shove a bagel in their face while driving). Most people eat food that requires basically no prep work for lunch most days. Eating out (with the exception of coffee and donuts in certain industries) is not a regular occurrence for most people because it's not justifiable at their income level.

I'm not denying that one can have meat at every meal if they so desire. I'm saying that as a matter of convenience many do not.