Just that really. I applaud the idea, and can see it works really well if you are a meat eater and can have some chicken breast or a salmon fillet which will both fill you up and be healthy at the same time, but after I have a couple of eggs for breakfast I'm basically stuck with cheese as a 'high fat' option, and that can't be healthy.
I know everyone will say eat tofu and lentils, but I just can't like tofu no matter how many times i try (how many meat eaters are voluntarily eating it regularly instead of a meat option? that's how nice it is), and lentils are lovely in dahl or as a (small) part of a veggie stew, but those are not meals for every single day. And anyway, they are not 'high fat', if that matters.
So...how do you do this sort of diet if you don't eat meat?