Scientific studies would be better sources of information than articles. In any case, the evolutionary discussions are not an argument for modern diets, for obvious reasons. The only thing with any merit in the links you posted is about DHA. Your body CAN produce it from plant sources, but if you must insist on taking DHA, it comes from algae, and there are algal sources. Animal sources get it from algae as well. If you are suggesting nutricional deficiencies due to DHA you need to provide real references indicating that, and not general articles on the nutritional profiles of meat vs vegetables that make vague associations with health outcomes.