Your title and question are very different, so I will respond based on the title.
You may find this article very interesting:
Basically, there is no hygienic reason for these dietary rules, as, if a clean animal died on its own and you ate it, then you must wash your clothing and be unclean until evening. (Leviticus 11:40)
So, would it make sense that you had some disease, but once the sun set you were now healthy?
There is nothing to imply that this was for health reason, but for ritual reasons, and perhaps to help the Jews to understand that they were not like other groups, and by following a different diet they could set themselves apart.
There is also Leviticus 11:35, where the rule is that if an unclean food was ever used on that oven or stove is now unclean and must be destroyed, as it will always be unclean.
If this was for health reasons, it could be scoured, disinfected with bleach, but if you are following these restrictions then you must take apart the oven or stove, regardless.
Everything, moreover, on which part of their carcass may fall becomes
unclean; an oven or a stove shall be smashed; they are unclean and
shall continue as unclean to you
If you feel you must follow these dietary restrictions, then you must follow all of them, including never use a used stove/oven, for example, as is found in James 2:10 (http://bible.cc/james/2-10.htm)
For whoever keeps the whole law and yet stumbles at just one point is
guilty of breaking all of it.