Jack Sprat could eat no fat.

His wife could eat no lean.

And so between them both, you see,

They licked the platter clean.

I've seen couples make it work. The guy gets to learn all about these really delicious vegan curries. The woman finds out how much meat gets thrown in the trash and maybe doesn't feel so bad when her husband rescues a prime rib or a sea bass filet or a dozen scallops the size of your fist from getting chucked in the dumpster at the end of the shift.