It's a myth that kosher rules were about health. Even at the time, those foods were no more dangerous than the things they were allowed to eat.
The kosher rules have more to do with cultural identity: "we are the people who eat/don't eat X". We have similar rules today. We revile people who eat foods we consider dirty (insects, dogs, horse, etc), but they suffer no ill effects.
They do reconsider the kosher rules in modern lights. Insect derived dyes are banned, for example. But they don't need scripture to tell you what's healthy. They use science for that.
The kosher rules have more to do with cultural identity: "we are the people who eat/don't eat X". We have similar rules today. We revile people who eat foods we consider dirty (insects, dogs, horse, etc), but they suffer no ill effects.
They do reconsider the kosher rules in modern lights. Insect derived dyes are banned, for example. But they don't need scripture to tell you what's healthy. They use science for that.