Noodles and fried tofu takes no longer to cook than a steak, and is just as good. A big pot of curried lentils can be set up in ten minutes, let simmer for about an hour, and lasts all week. Tacos with refried beans instead of hamburger is a straightforward substitute. The list goes on. (Nor am I sure that any of those are significantly less caloric than the equivalent meat dishes.)

I suspect that most people who think they can’t manage a vegetarianism, by experience or otherwise, are making the mistake of thinking that a “vegetarian diet” consists of just the vegetarian side-dishes familiar from a meat-eating diet. That is not true, and if you try to do it that way, of course it’s not going to work. A proper diet finds foods that fill the role of meat, one way or another.