HistoryPorn

Chicken for breakfast?

They were made of different stuff back then.

Your meal choices adapt when you have to wear a diaper for hours on end, and when you change that diaper its going to be in the equivalent of a large closet of confined space with two other guys. What astronauts choose is usually "low residue" meals. Meaning that your body absorbs nearly everything you eat. This would be the opposite of "high fiber" where there is a large amount of indigestible matter that passes all the way through. This was one of the reasons steak and eggs was so popular for launch day Astronauts. Its very low residue.