Check out the Ben Greenfield podcast that includes an interview on plant based diets: www.bengreenfieldfitness.com/category/podcast/feed/
Interesting philosophy that when we calorie count, we need to incorporate the amount of caloric burn associated with different types of food. Dense products, such as processed foods, take more energy to burn and digest. Non-processed foods, like getting carbs from fruit, move through quickly, take less energy to digest, and turn to fuel more efficiently.
The same interview talks about making a pizza crust with lentils and other assorted items for a vegan delight.
Greenfield throws some high tech stuff out there. Good to broaden the horizons. Enjoy.