There's "enough to survive," though, and "enough for a specific person to function optimally." Last winter I consulted a vegan nutritionist. I don't follow all of her recommendations, but one thing I did learn was that I wasn't eating enough protein. In order for me to feel good and not get light-headed or overly hungry between meals, I need to consume about 14 grams of protein at each meal. That's the equivalent of a cup of cooked beans, or a small serving of tofu. This is not at all a big deal when I'm at home. When I'm travelling, though, especially away from a major city, getting enough protein -- and enough calories, for that matter -- can be a challenge.
