According to popular legend, the sandwich was invented by John Montagu, the fourth Earl of Sandwich, who, while gambling, told his butler to put somemeat between two slices of bread so he could eat without interrupting the game and getting grease on the cards.
In fact, the first few days I sort of felt cheated, or maybe even a little bit hungry, because I wasn't able to eatmeat, but I found that this is mostly psychological, that as long as you have protein in some form, whether it's beans or tofu, and you get used to it, it's really - you don't feel like you're missing much at all.