Ja, ik schrik daar ook van, het advies om vleesbotten te koken! Maar buiten dat ziet deze meneer het in mijn ogen verkeerd. Ik weet niet hoe jouw of zijn Engels is? Maar misschien dat deze link interessant is voor hem om te lezen:
http://rawfed.com/myths/cookedfood.html
Dit is een korte (Engelse) samenvatting waarom gekookt vlees niet beter of makkelijker verteerd dan rauw:
Meat is essentially protein and fat. Animal protein is made up of amino acids - long chain amino acids. These amino acids are essential to the diet of the obligate carnivore. The cat metabolizes these amino acids, and does a straight protein-to-glucose conversion in order to produce energy and the keep the cells alive and functioning. This is accomplished by the liver, it is an enzyme function, and it is called gluconeogenesis.
When a protein is cooked, the long chain amino acids which make up the protein, become short chain amino acids, and at this point they become much more difficult for the stomach to digest and the liver to metabolize into energy. Digestive enzymes are also essential for the conversion of protein to energy, and these digestive enzymes are present in food in its raw form. They are destroyed in the presence of high heat or various other forms of processing. When digestive enzymes are destroyed, the body is called upon to find them in various other organs, particularly the liver until enough enzymes are rallied to digest the food, in the stomach and turn it into energy. This puts constant strain on the liver.