Lappe's Diet for A Small Planet

The forward of the first edition of this book influenced vegetarianism dramatically with its discussion of combining foods to create a whole protein at every meal.  What many vegetarians don't realize is that Lappe altered her forward with new nutritional information.  Her original assumption was that a complete protein was necessary at every meal based on the egg as the ideal human food.  But the body is capable of using different, incomplete proteins given to it throughout the day.  Some theorists claim it is possible to sustain human life with a constant diet as restrictive as just broccoli (Please don't try this.)  For most people, it gives freedom to not be concerned about protein malnutrition because they did not get their combinations right at every meal.