I don't remember who I heard of this from, but I think it was someone on LJ, a fair while back, and I am eternally grateful to them:

Weight Watchers recipe cards from 1974.

I remembered the site today, whilst looking at some of my mum's old recipe cards (from 1975, and of a very similar ilk) and had to go look for it. And as before, I cried with laughter.