yever see a steak? Its all marbled .
The concept of unclean and "cloven hooves" has gotta be a KJV diddy, since my Jewish uncles always told me that Jews didnt invent the concept of a devil, the Christians did. The "clean unclean" issues were doctrinal conclusions that were drawn in order to first preserve somwe sort of hygiene.
Thats why "seafood without scales or a face (clams etc) are "unclean"
We can't argue much if we use our current methods of prevention in cooking against those days when the laws were given.
The washing of hands before eating food wasn't a Torah's law, neither a regulation established by the prophets, but a rule imposed by the priests themselves later on.
Those priests weren't wrong after all, as we can understand that our current knowledge advice us to clean our hands before touching the food we are going to eat.
When I pointed how hard is separating fat from flesh in pork, however, there is something more that must be clarified.
Pigs have only one stomach, and the digestion process is simple, and pigs do not do well rejecting toxins. Have you ever saw a pig eating food? Of course they have a greatly powered saliva as a defense, but its digestive system do not allow the secretion of toxins and these go and storage themselves in the mixed flesh and fat of the pig.
For a moment observe every week, when the garbage truck picks up the garbage from your house. This is the job of the pig in nature. Pigs eat rotten bodies, the excrement of other animals, small animals, plants, anything.
Even farmers, if you think they use clean products for feeding pigs, well, some farmers "buy" garbage" in order to feed their swine farm.
Nature has its garbage trucks working 24/7 with pigs, ravens, vultures, catfish, rock fish, etc. You send the meat of these animals to a lab and great percent of toxins will be found.
It has been studied as well that scales in fish allows them to release bacteria and impurities. With fish without scales, bacteria and viruses stay freely inside their bodies. In other words, fish without scales can't "purify" itself from bacteria.
Animals with hard shells are like the gravel you put at the bottom of the fish tank. The use of gravel is not for decoration purposes alone but for purification of the water, when waves of the liquid pass thru them and the impurities are storage between the stones.
When you open the shell covering the head of crab, you will find a brownish substance with dirt. Such is the duty of these hard shell animals, to purify water. The impurities of the water in contact with the interior of the shell, the body of the crab, will transmit bacteria and toxins thru osmosis, and there you have, another "impure" animal not recommended for eating.
And there are more reasons explaining why the author of this law about pure and impure animals enjoyed a knowledge that is confirmed as correct when prevention against infections from eating "impure" animals is advised.
Something that you might argue in your favor is that meat from impure animals has a better taste.
But when we talk about what is good for your health, flavor is not the rule but what is recommended is prevention of not ingesting toxins, contaminated meat, etc.