eat clean food

Deuteronomy 14:1-29
The regulations of the foods, defined clean & unclean.
Clean animal that has a split hoof divided in two and that chews that cud.
Clean creatures living in the water that has fins and scales.
Clean birds, but the eagle, the vulture, kite, owl ,hawk, osprey, the cormorant, the stork and any kind of heron, the hoopoe and bat are unclean.
Do not cut yourselves or shave the front of your head for the dead.
Set aside a tenth of all that your fields produce each year. Eat the tithe with your family in the presence of the Lord your God always. If it i too far away from your place, it may exchange to money, then go to the place the Lord your God chose, use the silver to buy whatever you like, sheep, wine or other fermented drink and eat before the Lord. Do not neglect the Levites living in your towns.
Why?
Al these regulations are good for the men, unclean animal might bring some disease.
How?
Food is not for the living only, the words of the Lord may blesses people alive.