Did the articles you read recommend to cut out animal protein? I think that is what the suggestion is: to eat a plant-based diet, to reduce the risk of getting several illnesses like cancer, diabetes, cardiovascular disease. The tissue needs protein to build and repair itself. Legumes, whole grains, soy will deliver the 20 essential amino acids, if you mix it up and eat a variety of plant foods. http://www.leilanifarmsanctuary.org/43.html
Have you tried Quinoa? It is a complete protein source from plants. http://en.wikipedia.org/wiki/Quinoa#Nutritional_value
Kris Carr also has great nutritional information regarding the vegan lifestyle. http://crazysexylife.com/tag/diet/ and so does Gillian McKeith from "You are what you eat".
I hope this helped a little bit. Good luck with your research and let me know what you found out.