Eating only vegetables to loose weight

Rice and lentils combined contain all the amino acids necessary to form a complete protein. They do not contain any of the unhealthy fats present in red meat. A properly balanced and varied vegetarian diet is more healthy than a diet heavily based on animal protein, with the exception of fish. The important thing is to understand what protein is and that meat is not the only source. Seeds and nuts are particularly high, as is soya and other beans, but many other vegetables, such as mushrooms and buckwheat, contain good amounts, and are of course, all vegetables. If you can grasp the concept of fats having meat, dairy and vegetable sources, then it should not be too difficult. Here is a good article giving a straightforward account http://www.fitsugar.com/What-Complete-Protein-Inquiring-Vegetarians-Want-Kno-165298

many other vegetables, such as mushrooms and buckwheat, contain good amounts, and are of course, all vegetables.

I disagree with the claim that being vegetarian or vegan is more healthy, but am not interested in debating that. I think both are great diets for the right people. I also imagine that everyone at MFP knows that vegetables have some protein. I eat lots of vegetables, so see their protein in my log. None of them (other than the usual suspects, like beans, which I really don't think were meant here--saying "eat only vegetables" in common usage typically means something different than "eat vegetarian," and when people say "you need to eat more vegetables" they typically don't mean cereal or potatoes or rice). Anyway, I didn't recall mushrooms having all that much, so I just checked, and apparently 2 grams per cup according to the non-asterisk entry. That's not what I call a good amount, if you are seeking a source of protein. Mushrooms are great, IMO, but not for that reason, unless you are claiming that entry is off. Buckwheat does have a good amount, but also lots of calories, so again is highly unlikely to be what is being discussed here (it's a pseudo cereal).

If the question really were "will eating only vegetables, under the broadest possible definition, including beans and rice" cause me to lose extreme amounts of weight, all else equal, the answer would obviously be "depends on you, but extremely unlikely." Personally, if I went vegetarian or even vegan for a month I'd probably eat the same or more than I do now (the same if I logged, more if I just ate what I liked within those constraints), so I expect my weight loss would remain the same or be less. I also could not meet my protein goal as a vegan without eating significant amounts of stuff I prefer to eat only in moderation, like soy. This does not mean a vegan diet is not a good one, but it's part of why it would not be a good one for me.

But in any case that's not actually what I think this thread is about.