Digesting Raw Foods

Question: “I often have people telling me (including nutritionists and naturopaths) that raw foods are too difficult to digest and that we should rather eat cooked food. Also, there was recently here in the UK a talk on the radio and an article in the paper about a book that was written about how humans have developed as much as we have, though being the only species that cooks their food and that cooked nutrients are more bio-available than raw nutrients, etc.