Opinions differ on this question, but this is where I am at:
I believe that the health & hygiene codes of the OT do not have moral & ethical consequences, but many (if not all) have physical (health & hygienic) consequences.
Jesus said about hand-washing (in Matt. 15:11 & Mark 7:15-20) that it isn't what goes into one's mouth that makes them unclean, but rather what comes out of it.
On the other "hand," the Jews were spared from the Black Plague because they washed their hands regularly. So, that turned out to be a really good idea.
IIRC, a teacher by the name of Bill Gothard had reported that some couples he had (worked with?) reported that when they had sex on her period, they noticed a higher incidence of yeast infections. And (male) circumcision, arguably, has been shown to be the healthier choice. Paul was clear that it wasn't a (spiritual) requirement (for Gentiles, at least), but it isn't forbidden either. I believe this to apply to the dietary codes, as well, which are clearly limited to the Hebrew(?) community. But when a nation has God functioning as their health department, the rest of us would do well to take good notes.
For me, all of this would fall under the category of:
"Everything is permissible"--but not everything is beneficial. "Everything is permissible"--but not everything is constructive. 1Cor. 10:23