actually you missed the concept ENTIRELY.
Kosher is not about clean vs unclean (that is an English translation) it is about ritual purity which is very different.
I know about ritual purity and the like though I wonder why certain animals are not to be eaten as for instance why the meat of camel, swine, crab or rabbit meat (both treif) is any less healthy than cow or goat meat, while others can be killed and consumed and I also wonder about the logic behind the injunction that certain foods accompanied by certain other food items are also not permissible like meat and dairy cannot be mixed.
How sensible from the logical, scientific or mystical perspectives are any of these rules?
1) Grape products made by non-Jews may not be eaten.
2) Of the "beasts of the earth" (which basically refers to land mammals with the exception of swarming rodents), you may eat any animal that has cloven hooves and chews its cud.
3) Of the things that are in the waters, you may eat anything that has fins and scales. Lev. 11:9; Deut. 14:9. Thus, shellfish such as lobsters, oysters, shrimp, clams and crabs are all forbidden.
4) Rodents, reptiles, amphibians, and insects (except as mentioned above) are all forbidden.
5) If the lungs are free from such adhesions, the animal is deemed "glatt" (that is, "smooth").
6) The animal to be murdered must have no disease or flaws in the organs at the time of slaughter. These restrictions, ironically, do not apply to fish; only to the flocks and herds.
7) The sciatic nerve and its adjoining blood vessels may not be eaten.
8) the Talmud prohibits cooking meat and fish together or serving them on the same plates, because it is considered to be unhealthy. It is, however, permissible to eat fish and dairy together but not meat of animals and diary.
Kashrut/Kosher and halaal are not acceptable.
Vegetarianism does away with meat for all the given reasons in my post below -
Kosher and halaal are practices based on ignorance, superstition and cruelty.
From the viewpoint of matter, food reduces to classes of various chemicals.
From a deeper perspective, chemicals are a mixture of various forces - physical and vital.
Added to this is the mind element of the organism that infuses the chemicals and force fields.
So, what is pure or impure about chemicals and physical, vital and mental forces? Nothing at all.
What is important to note is is that hygienic norms are adhered to during the breeding, preservation and cooking stages.
However, certain classes of chemicals via food intake have a deleterious impact on health as proven by science.
From the logical and the yogic perspectives, those foods acquired through murder result in accumulation of bad karma and the intake of any food that is a result of murder/slaughter can unbalance the mind-body equilibrium since the pain/suffering experienced by say a cow while it's being murdered is imprinted as highly distorted mental-vital vibrations in its flesh molecules/force fields and this mass of disordered vibrations enters our body when we eat the flesh and this then adds to our store of negative vital and mental vibrations thus making us more prone to psychological and/or emotional disorders and besides, again, a non-vegetarian diet based on slaughter lowers our respect for life and induces in us cruelty and insensitivity to pain/suffering.
However, the earth nature and its concomitant state of consciousness (as part of the evolution of consciousness from a state of involution) has still not shaken off its unregenerate trappings and so killing for food and intake of products of murder seen in the animal and mammalian kingdoms continues on a mass scale.
There can be individual progress in this regard.
Food choice is determined by the state of consciousness one is in.